Platform Additional Stiffness and Damping

Hello everybody,

I am trying to understand the use of the Hydrodyn module’s section of the Platform Additional Stiffness and Damping (PASD). For example, I am modeling the OC4 semi-submersible platform using only potential flow theory. In this case, shouldn’t all entries in the PASD be equal to zero?

On the other hand, the initial setup of this platform, as when downloaded, comes with two entries [AddCLin(4,4) and AddCLin(5,5)], with values different from zero. Why? Is this due to the ballasted volume? Meaning that only when I have no ballasted volume all entries in the PASD should be zero (as wamit doesn’t account for ballasted volume, one would correct that in the hydrodyn file)?

In this case, if I change the ballasted volume I would need to change those two entries?

Best regards,

Tomás

Dear Tomás,

Your understanding is correct. The nonzero (4,4) and (5,5) elements of AddCLin in the HydroDyn model of OC4-DeepCwind semisubmersible model are associated with the water ballast. These can be derived using the equations documented in section 6.8.3 of the draft HydroDyn User’s Guide and Theory Manual: wind.nrel.gov/nwtc/docs/HydroDyn_Manual.pdf. Changing the water ballast should result in a change to AddCLin.

But if you plan to use the water ballasting feature of HydroDyn, please be aware of the recently discovered issue raised in OpenFAST, i.e.: github.com/OpenFAST/openfast/issues/245.

Best regards,

Dear Jason,

In case I follow the advice you provide in:https://github.com/OpenFAST/openfast/issues/245., I would use for the platform inertia (in elastodyn) the values provided in table 3.3 from nrel.gov/docs/fy14osti/60601.pdf right? Then, I would disable all ballasted members in section “filled members” of hydrodyn. But I would still need to keep the AddCLin(4,4) and AddCLin(5,5) with their “original/downloaded” values to account for the increased stiffness which is not accounted for in elastodyn, even if I increase the inertias there. Is this correct?

Best Regards,

Tomás

Dear Tomás,

Yes, you would use the values specified in Table 3-3 in ElastoDyn and remove the water ballast from HydroDyn. But in this case, you don’t need to specify nonzero values for AddCLin(4,4) and (5,5) because ElastoDyn intrinsically accounts for gravitational stiffness in roll and pitch.

Best regards,

Thank you very much!

Dear Jason,

I’m sorry but I run three cases (pitch decay test) and they all look different.

1case (blue): semi-submersible as it comes when downloaded

2case (yellow): semi-submersible with no ballasted water (inertias and mass transferred to elastodyn) and all AddCLin entries equal to zero

3case (red): semi-submersible with no ballasted water (inertias and mass transferred to elastodyn) but AddCLin(4,4) and (5,5) entries equal to the value of 1case (1451298897)

Acording to your last post, cases 1) and 2) should be equal right? What’s wrong here then?

Best regards,

Tomás

Dear Tomás,

Yes, I would expect cases (1) and (2) to match. Have you double-checked your inputs? For example, have you set PtfmCMzt = -13.46 m in case 2?

While there is no reason to run case (3), because you would be double counting the gravitational stiffening, I’m also surprised by these results. Why would adding pitch stiffness reduce the natural frequency? Are you sure the inputs are set properly?

Best regards,

Dear Jason,

I’ve re-run the cases, correcting the PtfmCMzt = -13.46 m (which I had forgotten), and everything matches: case (1) and (2) are equal and case (3) has a higher natural frequency, as would be expected.

Thanks for the debugging,

Tomás

Great!

Dear Jason,

Is the bug identified in the above GitHub issue still present in the code? If so, do you have any guidance on the maximum allowable platform yaw before these incorrect effects occur?

Thanks,

Brendan

Dear Brendan,

Good question. The improvements to HydroDyn related to floating platform structural flexibility and member-level loads mentioned in the above-referenced issue (github.com/OpenFAST/openfast/issues/245) have now been completed and released in OpenFAST v2.6. Included in that effort was an overhaul of how the water ballasting functionality was implemented. So, I would hope that this bug has been fixed, but I don’t recall that we went back to check that. I’ll post a comment on GitHub issues.

Best regards,

Dear Jason,

Thanks for your response. I am running simulations of a modified version of the OC4 platform/turbine configuration with longer mooring lines, this causes some scenarios with large platform yaws. I have already run a number of simulations with OpenFAST v2.4.0 before I was aware of this bug. I have two questions:

  1. Is there a way to verify whether or not my results were impacted (or is it the case where the results are always impacted)?
  2. Is there a way for me to verify whether this bug is still in v2.6.0; could you suggest a scenario I could test where you were previously seeing incorrect results?

Thanks,

Brendan

Dear Brendan,

Here are my answers to your questions (in reverse order):
2) Perhaps the easiest way to see if the problem exists in OpenFAST v2.6 is to compile both OpenFAST v2.4 and OpenFAST v2.6 with the “OUTPUT_ADDEDMASS” compiler directive defined. This compiler directive was added to the source code (and used in source file FAST_Solver.f90) many years ago to debug the 6x6 added mass matrix coming out of HydroDyn. If you do this, I’d expect that you’d see the unphysical asymmetry in Ixy / Iyx in OpenFAST v2.4, but I’m hopeful that you will not see this asymmetry in OpenFAST v2.6.

  1. I believe the bug was always present in OpenFAST v2.4, but the results were only negatively effected for "sizeable platform-yaw angles " (the larger the yaw angle, the larger the error). I would say the error is probably negligible for platform-yaw angles less than 5deg, but not negligible for platform-yaw angles larger than 10deg. Assuming the bug is fixed in OpenFAST v2.6, you could spot check your results from OpenFAST v2.4 with OpenFAST v2.6 to see what differences arise.

Best regards,

Dear Jason,

I have two further questions:

  1. In the most recent version of the regression tests the HydroDyn file for the OC4 model has an all zero ‘PLATFORM ADDITIONAL STIFFNESS AND DAMPING’ matrix, are the additional linear stiffness terms no longer needed with the most recent updates to HydroDyn?
  2. Does using fluid filled members improve the simulation accuracy, or does it only change the modelling accuracy? In other words, will I be missing any physical effects by moving the fluid filled mass to ElastoDyn and removing the fluid filled members?

Thanks,

Brendan

Dear Brendan,

Great questions; here are my answers:

  1. That is correct, the additional linear stiffness to account for unmodeled effects associated with filled members is no longer needed in HydroDyn in OpenFAST v2.6 and newer. This is because the hydrostatics in the strip-theory solution (including for filled members / fluid ballast) are recalculated in OpenFAST v2.6 every time step based on the displaced position/orientation of the floating substructure.
  2. When modeling the floating substructure rigidly, it shouldn’t matter where the fluid ballast effects are accounted for (whether in HydroDyn or ElastoDyn). However–assuming the mass, center of mass, and inertia of the fluid ballast is specified correctly in both ElastoDyn and HydroDyn–in OpenFAST v2.4 and earlier, I would expect some differences between the two methods due the aforementioned bug in HydroDyn. When modeling the floating substructure as a flexible body (in OpenFAST v2.6 and newer), it would be preferred to model the fluid ballast within HydroDyn to ensure the loads distributed throughout the flexible substructure are properly accounted for.

Best regards,

Dear Jason,

Thank you for your help. I chose to upgrade to OpenFAST v2.6.0 but I still removed the fluid filled members just to be on the safe side. However, in v2.6.0 when I compare the non-fluid-filled vs fluid-filled member solution, I see differences in the output when comparing the pitch perturbation response. The changes I made are as follows:

ElastoDyn:

     -13.46   PtfmCMzt    - Vertical distance from the ground level [onshore] or MSL [offshore] to the platform CM (meters)
 1.3473E+07   PtfmMass    - Platform mass (kg)
  6.827E+09   PtfmRIner   - Platform inertia for roll tilt rotation about the platform CM (kg m^2)
  6.827E+09   PtfmPIner   - Platform inertia for pitch tilt rotation about the platform CM (kg m^2)
  1.226E+10   PtfmYIner   - Platform inertia for yaw rotation about the platform CM (kg m^2)

HydroDyn:

             0   NFillGroups     - Number of filled member groups (-) [If FillDens = DEFAULT, then FillDens = WtrDens; FillFSLoc is related to MSL2SWL]

Do you have any idea why I am seeing these differences? Unfortunately I have not had time to check the added mass matrix from HydroDyn for v2.6.0.

Thanks,

Brendan

Dear Brandon,

Are you saying that you’ve compared two OpenFAST v2.6 solutions–one with the water ballast modeled directly in HydroDyn and the steel only modeled in ElastoDyn, and the other with the water ballast and steel modeled in ElastoDyn (no ballast modeled in HydroDyn) and you get slightly different pitch free decay results? Can you share your two ElastoDyn and two HydroDyn input files?

Best regards,

Dear Jason,

Yes, those results are comparing two different v2.6.0 simulations where the changes made are as described in the GitHub issue (minus changing the PASD matrix). The simulations are run using the windows .exe distributed with the v2.6.0 release on GitHub. The input files originate from the latest rtest. Unfortunately for whatever reason the forum won’t allow me to attach the files (HTTP error), so I have copy pasted them below, also posting them in the same post exceeds the character limit, so I’ve used two posts.

Thanks,

Brendan

Fluid Filled Files
ElastoDyn:

------- ELASTODYN for OpenFAST INPUT FILE -------------------------------------------
NREL 5.0 MW Baseline Wind Turbine for Use in Offshore Analysis. Properties from Dutch Offshore Wind Energy Converter (DOWEC) 6MW Pre-Design (10046_009.pdf) and REpower 5M 5MW (5m_uk.pdf).
---------------------- SIMULATION CONTROL --------------------------------------
False         Echo        - Echo input data to "<RootName>.ech" (flag)
          3   Method      - Integration method: {1: RK4, 2: AB4, or 3: ABM4} (-)
"DEFAULT"     DT          - Integration time step (s)
---------------------- ENVIRONMENTAL CONDITION ---------------------------------
    9.80665   Gravity     - Gravitational acceleration (m/s^2)
---------------------- DEGREES OF FREEDOM --------------------------------------
True          FlapDOF1    - First flapwise blade mode DOF (flag)
True          FlapDOF2    - Second flapwise blade mode DOF (flag)
True          EdgeDOF     - First edgewise blade mode DOF (flag)
False         TeetDOF     - Rotor-teeter DOF (flag) [unused for 3 blades]
True          DrTrDOF     - Drivetrain rotational-flexibility DOF (flag)
True          GenDOF      - Generator DOF (flag)
True          YawDOF      - Yaw DOF (flag)
True          TwFADOF1    - First fore-aft tower bending-mode DOF (flag)
True          TwFADOF2    - Second fore-aft tower bending-mode DOF (flag)
True          TwSSDOF1    - First side-to-side tower bending-mode DOF (flag)
True          TwSSDOF2    - Second side-to-side tower bending-mode DOF (flag)
True          PtfmSgDOF   - Platform horizontal surge translation DOF (flag)
True          PtfmSwDOF   - Platform horizontal sway translation DOF (flag)
True          PtfmHvDOF   - Platform vertical heave translation DOF (flag)
True          PtfmRDOF    - Platform roll tilt rotation DOF (flag)
True          PtfmPDOF    - Platform pitch tilt rotation DOF (flag)
True          PtfmYDOF    - Platform yaw rotation DOF (flag)
---------------------- INITIAL CONDITIONS --------------------------------------
          0   OoPDefl     - Initial out-of-plane blade-tip displacement (meters)
          0   IPDefl      - Initial in-plane blade-tip deflection (meters)
0   BlPitch(1)  - Blade 1 initial pitch (degrees)
0   BlPitch(2)  - Blade 2 initial pitch (degrees)
0   BlPitch(3)  - Blade 3 initial pitch (degrees)
          0   TeetDefl    - Initial or fixed teeter angle (degrees) [unused for 3 blades]
          0   Azimuth     - Initial azimuth angle for blade 1 (degrees)
0   RotSpeed    - Initial or fixed rotor speed (rpm)
0   NacYaw      - Initial or fixed nacelle-yaw angle (degrees)
          0   TTDspFA     - Initial fore-aft tower-top displacement (meters)
          0   TTDspSS     - Initial side-to-side tower-top displacement (meters)
0   PtfmSurge   - Initial or fixed horizontal surge translational displacement of platform (meters)
0   PtfmSway    - Initial or fixed horizontal sway translational displacement of platform (meters)
          0   PtfmHeave   - Initial or fixed vertical heave translational displacement of platform (meters)
0   PtfmRoll    - Initial or fixed roll tilt rotational displacement of platform (degrees)
5   PtfmPitch   - Initial or fixed pitch tilt rotational displacement of platform (degrees)
0   PtfmYaw     - Initial or fixed yaw rotational displacement of platform (degrees)
---------------------- TURBINE CONFIGURATION -----------------------------------
          3   NumBl       - Number of blades (-)
         63   TipRad      - The distance from the rotor apex to the blade tip (meters)
        1.5   HubRad      - The distance from the rotor apex to the blade root (meters)
       -2.5   PreCone(1)  - Blade 1 cone angle (degrees)
       -2.5   PreCone(2)  - Blade 2 cone angle (degrees)
       -2.5   PreCone(3)  - Blade 3 cone angle (degrees) [unused for 2 blades]
          0   HubCM       - Distance from rotor apex to hub mass [positive downwind] (meters)
          0   UndSling    - Undersling length [distance from teeter pin to the rotor apex] (meters) [unused for 3 blades]
          0   Delta3      - Delta-3 angle for teetering rotors (degrees) [unused for 3 blades]
          0   AzimB1Up    - Azimuth value to use for I/O when blade 1 points up (degrees)
    -5.0191   OverHang    - Distance from yaw axis to rotor apex [3 blades] or teeter pin [2 blades] (meters)
      1.912   ShftGagL    - Distance from rotor apex [3 blades] or teeter pin [2 blades] to shaft strain gages [positive for upwind rotors] (meters)
         -5   ShftTilt    - Rotor shaft tilt angle (degrees)
        1.9   NacCMxn     - Downwind distance from the tower-top to the nacelle CM (meters)
          0   NacCMyn     - Lateral  distance from the tower-top to the nacelle CM (meters)
       1.75   NacCMzn     - Vertical distance from the tower-top to the nacelle CM (meters)
   -3.09528   NcIMUxn     - Downwind distance from the tower-top to the nacelle IMU (meters)
          0   NcIMUyn     - Lateral  distance from the tower-top to the nacelle IMU (meters)
    2.23336   NcIMUzn     - Vertical distance from the tower-top to the nacelle IMU (meters)
    1.96256   Twr2Shft    - Vertical distance from the tower-top to the rotor shaft (meters)
       87.6   TowerHt     - Height of tower above ground level [onshore] or MSL [offshore] (meters)
         10   TowerBsHt   - Height of tower base above ground level [onshore] or MSL [offshore] (meters)
          0   PtfmCMxt    - Downwind distance from the ground level [onshore] or MSL [offshore] to the platform CM (meters)
          0   PtfmCMyt    - Lateral distance from the ground level [onshore] or MSL [offshore] to the platform CM (meters)
    -8.6588   PtfmCMzt    - Vertical distance from the ground level [onshore] or MSL [offshore] to the platform CM (meters)
          0   PtfmRefzt   - Vertical distance from the ground level [onshore] or MSL [offshore] to the platform reference point (meters)
---------------------- MASS AND INERTIA ----------------------------------------
          0   TipMass(1)  - Tip-brake mass, blade 1 (kg)
          0   TipMass(2)  - Tip-brake mass, blade 2 (kg)
          0   TipMass(3)  - Tip-brake mass, blade 3 (kg) [unused for 2 blades]
      56780   HubMass     - Hub mass (kg)
     115926   HubIner     - Hub inertia about rotor axis [3 blades] or teeter axis [2 blades] (kg m^2)
    534.116   GenIner     - Generator inertia about HSS (kg m^2)
     240000   NacMass     - Nacelle mass (kg)
2.60789E+06   NacYIner    - Nacelle inertia about yaw axis (kg m^2)
          0   YawBrMass   - Yaw bearing mass (kg)
3.85218E+06   PtfmMass    - Platform mass (kg)
2.56193E+09   PtfmRIner   - Platform inertia for roll tilt rotation about the platform CM (kg m^2)
2.56193E+09   PtfmPIner   - Platform inertia for pitch tilt rotation about the platform CM (kg m^2)
4.24265E+09   PtfmYIner   - Platform inertia for yaw rotation about the platform CM (kg m^2)
---------------------- BLADE ---------------------------------------------------
         17   BldNodes    - Number of blade nodes (per blade) used for analysis (-)
"../5MW_Baseline/NRELOffshrBsline5MW_Blade.dat"    BldFile(1)  - Name of file containing properties for blade 1 (quoted string)
"../5MW_Baseline/NRELOffshrBsline5MW_Blade.dat"    BldFile(2)  - Name of file containing properties for blade 2 (quoted string)
"../5MW_Baseline/NRELOffshrBsline5MW_Blade.dat"    BldFile(3)  - Name of file containing properties for blade 3 (quoted string) [unused for 2 blades]
---------------------- ROTOR-TEETER --------------------------------------------
          0   TeetMod     - Rotor-teeter spring/damper model {0: none, 1: standard, 2: user-defined from routine UserTeet} (switch) [unused for 3 blades]
          0   TeetDmpP    - Rotor-teeter damper position (degrees) [used only for 2 blades and when TeetMod=1]
          0   TeetDmp     - Rotor-teeter damping constant (N-m/(rad/s)) [used only for 2 blades and when TeetMod=1]
          0   TeetCDmp    - Rotor-teeter rate-independent Coulomb-damping moment (N-m) [used only for 2 blades and when TeetMod=1]
          0   TeetSStP    - Rotor-teeter soft-stop position (degrees) [used only for 2 blades and when TeetMod=1]
          0   TeetHStP    - Rotor-teeter hard-stop position (degrees) [used only for 2 blades and when TeetMod=1]
          0   TeetSSSp    - Rotor-teeter soft-stop linear-spring constant (N-m/rad) [used only for 2 blades and when TeetMod=1]
          0   TeetHSSp    - Rotor-teeter hard-stop linear-spring constant (N-m/rad) [used only for 2 blades and when TeetMod=1]
---------------------- DRIVETRAIN ----------------------------------------------
        100   GBoxEff     - Gearbox efficiency (%)
         97   GBRatio     - Gearbox ratio (-)
8.67637E+08   DTTorSpr    - Drivetrain torsional spring (N-m/rad)
  6.215E+06   DTTorDmp    - Drivetrain torsional damper (N-m/(rad/s))
---------------------- FURLING -------------------------------------------------
False         Furling     - Read in additional model properties for furling turbine (flag) [must currently be FALSE)
"unused"      FurlFile    - Name of file containing furling properties (quoted string) [unused when Furling=False]
---------------------- TOWER ---------------------------------------------------
         20   TwrNodes    - Number of tower nodes used for analysis (-)
"NRELOffshrBsline5MW_OC4DeepCwindSemi_ElastoDyn_Tower.dat"    TwrFile     - Name of file containing tower properties (quoted string)
---------------------- OUTPUT --------------------------------------------------
True          SumPrint    - Print summary data to "<RootName>.sum" (flag)
          2   OutFile     - Switch to determine where output will be placed: {1: in module output file only; 2: in glue code output file only; 3: both} (currently unused)
True          TabDelim    - Use tab delimiters in text tabular output file? (flag) (currently unused)
"ES10.3E2"    OutFmt      - Format used for text tabular output (except time).  Resulting field should be 10 characters. (quoted string) (currently unused)
          0   TStart      - Time to begin tabular output (s) (currently unused)
          1   DecFact     - Decimation factor for tabular output {1: output every time step} (-) (currently unused)
          1   NTwGages    - Number of tower nodes that have strain gages for output [0 to 9] (-)
         10   TwrGagNd    - List of tower nodes that have strain gages [1 to TwrNodes] (-) [unused if NTwGages=0]
          1   NBlGages    - Number of blade nodes that have strain gages for output [0 to 9] (-)
          9   BldGagNd    - List of blade nodes that have strain gages [1 to BldNodes] (-) [unused if NBlGages=0]
              OutList     - The next line(s) contains a list of output parameters.  See OutListParameters.xlsx for a listing of available output channels, (-)
"Azimuth"                 - Blade 1 azimuth angle
"RotSpeed"                - Low-speed shaft speed
"GenSpeed"                - High-speed shaft speed
"OoPDefl1"                - Blade 1 out-of-plane deflection
"IPDefl1"                 - Blade 1 in-plane     deflection
"TwstDefl1"               - Blade 1 tip twist
"BldPitch1"               - Blade 1 pitch angle
"TTDspFA"                 - Tower fore-aft     deflection
"TTDspSS"                 - Tower side-to-side deflection
"TTDspTwst"               - Tower top twist
"PtfmSurge"               - Platform translational surge displacement
"PtfmSway"                - Platform translational sway  displacement
"PtfmHeave"               - Platform translational heave displacement
"PtfmRoll"                - Platform rotational roll  displacement
"PtfmPitch"               - Platform rotational pitch displacement
"PtfmYaw"                 - Platform rotational yaw   displacement
"RootFxc1"                - Out-of-plane shear force at the root of blade 1
"RootFyc1"                - In-plane     shear force at the root of blade 1
"RootFzc1"                - Axial              force at the root of blade 1
"RootMxc1"                - In-plane     bending moment at the root of blade 1
"RootMyc1"                - Out-of-plane bending moment at the root of blade 1
"RootMzc1"                - Pitching             moment at the root of blade 1
"RotTorq"                 - Rotor torque
"LSSGagMya"               - Low-speed shaft 0- rotating bending moments at the main bearing
"LSSGagMza"               - Low-speed shaft 90-rotating bending moments at the main bearing
"YawBrFxp"                - Fore-aft     shear force at the top of the tower (not rotating with nacelle yaw)
"YawBrFyp"                - Side-to-side shear force at the top of the tower (not rotating with nacelle yaw)
"YawBrFzp"                - Vertical           force at the top of the tower (not rotating with nacelle yaw)
"YawBrMxp"                - Side-to-side bending moment at the top of the tower (not rotating with nacelle yaw)
"YawBrMyp"                - Fore-aft     bending moment at the top of the tower (not rotating with nacelle yaw)
"YawBrMzp"                - Yaw                  moment at the top of the tower (not rotating with nacelle yaw)
"TwrBsFxt"                - Fore-aft     shear force at the base of the tower (platform)
"TwrBsFyt"                - Side-to-side shear force at the base of the tower (platform)
"TwrBsFzt"                - Vertical           force at the base of the tower (platform)
"TwrBsMxt"                - Side-to-side bending moment at the base of the tower (platform)
"TwrBsMyt"                - Fore-aft     bending moment at the base of the tower (platform)
"TwrBsMzt"                - Yaw                  moment at the base of the tower (platform)
END of input file (the word "END" must appear in the first 3 columns of this last OutList line)
---------------------------------------------------------------------------------------

HydroDyn:

------- HydroDyn Input File ----------------------------------------------------
NREL 5.0 MW offshore baseline floating platform HydroDyn input properties for the OC4 Semi-submersible.
False            Echo           - Echo the input file data (flag)
---------------------- ENVIRONMENTAL CONDITIONS --------------------------------
          1025   WtrDens        - Water density (kg/m^3)
           200   WtrDpth        - Water depth (meters)
             0   MSL2SWL        - Offset between still-water level and mean sea level (meters) [positive upward; unused when WaveMod = 6; must be zero if PotMod=1 or 2]
---------------------- WAVES ---------------------------------------------------
             0   WaveMod        - Incident wave kinematics model {0: none=still water, 1: regular (periodic), 1P#: regular with user-specified phase, 2: JONSWAP/Pierson-Moskowitz spectrum (irregular), 3: White noise spectrum (irregular), 4: user-defined spectrum from routine UserWaveSpctrm (irregular), 5: Externally generated wave-elevation time series, 6: Externally generated full wave-kinematics time series [option 6 is invalid for PotMod/=0]} (switch)
             0   WaveStMod      - Model for stretching incident wave kinematics to instantaneous free surface {0: none=no stretching, 1: vertical stretching, 2: extrapolation stretching, 3: Wheeler stretching} (switch) [unused when WaveMod=0 or when PotMod/=0]
          4600   WaveTMax       - Analysis time for incident wave calculations (sec) [unused when WaveMod=0; determines WaveDOmega=2Pi/WaveTMax in the IFFT]
           0.2   WaveDT         - Time step for incident wave calculations     (sec) [unused when WaveMod=0; 0.1<=WaveDT<=1.0 recommended; determines WaveOmegaMax=Pi/WaveDT in the IFFT]
        1.2646   WaveHs         - Significant wave height of incident waves (meters) [used only when WaveMod=1, 2, or 3]
            10   WaveTp         - Peak-spectral period of incident waves       (sec) [used only when WaveMod=1 or 2]
"DEFAULT"        WavePkShp      - Peak-shape parameter of incident wave spectrum (-) or DEFAULT (string) [used only when WaveMod=2; use 1.0 for Pierson-Moskowitz]
      0.314159   WvLowCOff      - Low  cut-off frequency or lower frequency limit of the wave spectrum beyond which the wave spectrum is zeroed (rad/s) [unused when WaveMod=0, 1, or 6]
      1.570796   WvHiCOff       - High cut-off frequency or upper frequency limit of the wave spectrum beyond which the wave spectrum is zeroed (rad/s) [unused when WaveMod=0, 1, or 6]
             0   WaveDir        - Incident wave propagation heading direction                         (degrees) [unused when WaveMod=0 or 6]
             0   WaveDirMod     - Directional spreading function {0: none, 1: COS2S}                  (-)       [only used when WaveMod=2,3, or 4]
             1   WaveDirSpread  - Wave direction spreading coefficient ( > 0 )                        (-)       [only used when WaveMod=2,3, or 4 and WaveDirMod=1]
             1   WaveNDir       - Number of wave directions                                           (-)       [only used when WaveMod=2,3, or 4 and WaveDirMod=1; odd number only]
             0   WaveDirRange   - Range of wave directions (full range: WaveDir +/- 1/2*WaveDirRange) (degrees) [only used when WaveMod=2,3,or 4 and WaveDirMod=1]
     123456789   WaveSeed(1)    - First  random seed of incident waves [-2147483648 to 2147483647]    (-)       [unused when WaveMod=0, 5, or 6]
        RANLUX   WaveSeed(2)    - Second random seed of incident waves [-2147483648 to 2147483647] for intrinsic pRNG, or an alternative pRNG: "RanLux"    (-)       [unused when WaveMod=0, 5, or 6]
FALSE            WaveNDAmp      - Flag for normally distributed amplitudes                            (flag)    [only used when WaveMod=2, 3, or 4]
""               WvKinFile      - Root name of externally generated wave data file(s)        (quoted string)    [used only when WaveMod=5 or 6]
             1   NWaveElev      - Number of points where the incident wave elevations can be computed (-)       [maximum of 9 output locations]
             0   WaveElevxi     - List of xi-coordinates for points where the incident wave elevations can be output (meters) [NWaveElev points, separated by commas or white space; usused if NWaveElev = 0]
             0   WaveElevyi     - List of yi-coordinates for points where the incident wave elevations can be output (meters) [NWaveElev points, separated by commas or white space; usused if NWaveElev = 0]
---------------------- 2ND-ORDER WAVES ----------------------------------------- [unused with WaveMod=0 or 6]
FALSE            WvDiffQTF      - Full difference-frequency 2nd-order wave kinematics (flag)
FALSE            WvSumQTF       - Full summation-frequency  2nd-order wave kinematics (flag)
             0   WvLowCOffD     - Low  frequency cutoff used in the difference-frequencies (rad/s) [Only used with a difference-frequency method]
      1.256637   WvHiCOffD      - High frequency cutoff used in the difference-frequencies (rad/s) [Only used with a difference-frequency method]
      0.618319   WvLowCOffS     - Low  frequency cutoff used in the summation-frequencies  (rad/s) [Only used with a summation-frequency  method]
      3.141593   WvHiCOffS      - High frequency cutoff used in the summation-frequencies  (rad/s) [Only used with a summation-frequency  method]
---------------------- CURRENT ------------------------------------------------- [unused with WaveMod=6]
             0   CurrMod        - Current profile model {0: none=no current, 1: standard, 2: user-defined from routine UserCurrent} (switch)
             0   CurrSSV0       - Sub-surface current velocity at still water level  (m/s) [used only when CurrMod=1]
"DEFAULT"        CurrSSDir      - Sub-surface current heading direction (degrees) or DEFAULT (string) [used only when CurrMod=1]
            20   CurrNSRef      - Near-surface current reference depth            (meters) [used only when CurrMod=1]
             0   CurrNSV0       - Near-surface current velocity at still water level (m/s) [used only when CurrMod=1]
             0   CurrNSDir      - Near-surface current heading direction         (degrees) [used only when CurrMod=1]
             0   CurrDIV        - Depth-independent current velocity                 (m/s) [used only when CurrMod=1]
             0   CurrDIDir      - Depth-independent current heading direction    (degrees) [used only when CurrMod=1]
---------------------- FLOATING PLATFORM --------------------------------------- [unused with WaveMod=6]
             1   PotMod         - Potential-flow model {0: none=no potential flow, 1: frequency-to-time-domain transforms based on WAMIT output, 2: fluid-impulse theory (FIT)} (switch)
             1   ExctnMod       - Wave-excitation model {0: no wave-excitation calculation, 1: DFT, 2: state-space} (switch) [only used when PotMod=1; STATE-SPACE REQUIRES *.ssexctn INPUT FILE]
             1   RdtnMod        - Radiation memory-effect model {0: no memory-effect calculation, 1: convolution, 2: state-space} (switch) [only used when PotMod=1; STATE-SPACE REQUIRES *.ss INPUT FILE]
            60   RdtnTMax       - Analysis time for wave radiation kernel calculations (sec) [only used when PotMod=1 and RdtnMod=1; determines RdtnDOmega=Pi/RdtnTMax in the cosine transform; MAKE SURE THIS IS LONG ENOUGH FOR THE RADIATION IMPULSE RESPONSE FUNCTIONS TO DECAY TO NEAR-ZERO FOR THE GIVEN PLATFORM!]
        0.0125   RdtnDT         - Time step for wave radiation kernel calculations (sec) [only used when PotMod=1 and ExctnMod>1 or RdtnMod>0; DT<=RdtnDT<=0.1 recommended; determines RdtnOmegaMax=Pi/RdtnDT in the cosine transform]
             1   NBody          - Number of WAMIT bodies to be used (-) [>=1; only used when PotMod=1. If NBodyMod=1, the WAMIT data contains a vector of size 6*NBody x 1 and matrices of size 6*NBody x 6*NBody; if NBodyMod>1, there are NBody sets of WAMIT data each with a vector of size 6 x 1 and matrices of size 6 x 6]
             1   NBodyMod       - Body coupling model {1: include coupling terms between each body and NBody in HydroDyn equals NBODY in WAMIT, 2: neglect coupling terms between each body and NBODY=1 with XBODY=0 in WAMIT, 3: Neglect coupling terms between each body and NBODY=1 with XBODY=/0 in WAMIT} (switch) [only used when PotMod=1]
"../5MW_Baseline/HydroData/marin_semi"    PotFile       - Root name of potential-flow model data; WAMIT output files containing the linear, nondimensionalized, hydrostatic restoring matrix (.hst), frequency-dependent hydrodynamic added mass matrix and damping matrix (.1), and frequency- and direction-dependent wave excitation force vector per unit wave amplitude (.3) (quoted string) [1 to NBody if NBodyMod>1] [MAKE SURE THE FREQUENCIES INHERENT IN THESE WAMIT FILES SPAN THE PHYSICALLY-SIGNIFICANT RANGE OF FREQUENCIES FOR THE GIVEN PLATFORM; THEY MUST CONTAIN THE ZERO- AND INFINITE-FREQUENCY LIMITS!]
             1   WAMITULEN      - Characteristic body length scale used to redimensionalize WAMIT output (meters) [1 to NBody if NBodyMod>1] [only used when PotMod=1]
           0.0   PtfmRefxt      - The xt offset of the body reference point(s) from (0,0,0) (meters) [1 to NBody] [only used when PotMod=1]
           0.0   PtfmRefyt      - The yt offset of the body reference point(s) from (0,0,0) (meters) [1 to NBody] [only used when PotMod=1]
           0.0   PtfmRefzt      - The zt offset of the body reference point(s) from (0,0,0) (meters) [1 to NBody] [only used when PotMod=1. If NBodyMod=2,PtfmRefzt=0.0]
           0.0   PtfmRefztRot   - The rotation about zt of the body reference frame(s) from xt/yt (degrees) [1 to NBody] [only used when PotMod=1]
         13917   PtfmVol0       - Displaced volume of water when the body is in its undisplaced position (m^3) [1 to NBody] [only used when PotMod=1; USE THE SAME VALUE COMPUTED BY WAMIT AS OUTPUT IN THE .OUT FILE!]
           0.0   PtfmCOBxt      - The xt offset of the center of buoyancy (COB) from (0,0) (meters) [1 to NBody] [only used when PotMod=1]
           0.0   PtfmCOByt      - The yt offset of the center of buoyancy (COB) from (0,0) (meters) [1 to NBody] [only used when PotMod=1]
---------------------- 2ND-ORDER FLOATING PLATFORM FORCES ---------------------- [unused with WaveMod=0 or 6, or PotMod=0 or 2]
             0   MnDrift        - Mean-drift 2nd-order forces computed                                       {0: None; [7, 8, 9, 10, 11, or 12]: WAMIT file to use} [Only one of MnDrift, NewmanApp, or DiffQTF can be non-zero. If NBody>1, MnDrift  /=8]
             0   NewmanApp      - Mean- and slow-drift 2nd-order forces computed with Newman's approximation {0: None; [7, 8, 9, 10, 11, or 12]: WAMIT file to use} [Only one of MnDrift, NewmanApp, or DiffQTF can be non-zero. If NBody>1, NewmanApp/=8. Used only when WaveDirMod=0]
            12   DiffQTF        - Full difference-frequency 2nd-order forces computed with full QTF          {0: None; [10, 11, or 12]: WAMIT file to use}          [Only one of MnDrift, NewmanApp, or DiffQTF can be non-zero]
            12   SumQTF         - Full summation -frequency 2nd-order forces computed with full QTF          {0: None; [10, 11, or 12]: WAMIT file to use}
---------------------- PLATFORM ADDITIONAL STIFFNESS AND DAMPING  -------------- [unused with PotMod=0 or 2]
             0   AddF0    - Additional preload (N, N-m) [If NBodyMod=1, one size 6*NBody x 1 vector; if NBodyMod>1, NBody size 6 x 1 vectors]
             0
             0
             0
             0
             0
             0             0             0             0             0             0   AddCLin  - Additional linear stiffness (N/m, N/rad, N-m/m, N-m/rad)                     [If NBodyMod=1, one size 6*NBody x 6*NBody matrix; if NBodyMod>1, NBody size 6 x 6 matrices]
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0   AddBLin  - Additional linear damping(N/(m/s), N/(rad/s), N-m/(m/s), N-m/(rad/s))        [If NBodyMod=1, one size 6*NBody x 6*NBody matrix; if NBodyMod>1, NBody size 6 x 6 matrices]
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0   AddBQuad - Additional quadratic drag(N/(m/s)^2, N/(rad/s)^2, N-m(m/s)^2, N-m/(rad/s)^2) [If NBodyMod=1, one size 6*NBody x 6*NBody matrix; if NBodyMod>1, NBody size 6 x 6 matrices]
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
---------------------- AXIAL COEFFICIENTS --------------------------------------
             2   NAxCoef        - Number of axial coefficients (-)
AxCoefID  AxCd     AxCa     AxCp
   (-)    (-)      (-)      (-)
    1     0.00     0.00     1.00
    2     9.60     0.00     1.00
---------------------- MEMBER JOINTS -------------------------------------------
            44   NJoints        - Number of joints (-)   [must be exactly 0 or at least 2]
JointID   Jointxi     Jointyi     Jointzi  JointAxID   JointOvrlp   [JointOvrlp= 0: do nothing at joint, 1: eliminate overlaps by calculating super member]
   (-)     (m)         (m)         (m)        (-)       (switch)
    1     0.00000     0.00000   -20.00000      1            0
    2     0.00000     0.00000    10.00000      1            0
    3    14.43376    25.00000   -14.00000      1            0
    4    14.43376    25.00000    12.00000      1            0
    5   -28.86751     0.00000   -14.00000      1            0
    6   -28.86751     0.00000    12.00000      1            0
    7    14.43376   -25.00000   -14.00000      1            0
    8    14.43376   -25.00000    12.00000      1            0
    9    14.43375    25.00000   -20.00000      2            0
   10   -28.86750     0.00000   -20.00000      2            0
   11    14.43375   -25.00000   -20.00000      2            0
   12     9.23760    22.00000    10.00000      1            0
   13   -23.67130     3.00000    10.00000      1            0
   14   -23.67130    -3.00000    10.00000      1            0
   15     9.23760   -22.00000    10.00000      1            0
   16    14.43375   -19.00000    10.00000      1            0
   17    14.43375    19.00000    10.00000      1            0
   18     4.04145    19.00000   -17.00000      1            0
   19   -18.47520     6.00000   -17.00000      1            0
   20   -18.47520    -6.00000   -17.00000      1            0
   21     4.04145   -19.00000   -17.00000      1            0
   22    14.43375   -13.00000   -17.00000      1            0
   23    14.43375    13.00000   -17.00000      1            0
   24     1.62500     2.81500    10.00000      1            0
   25    11.43376    19.80385    10.00000      1            0
   26    -3.25000     0.00000    10.00000      1            0
   27   -22.87000     0.00000    10.00000      1            0
   28     1.62500    -2.81500    10.00000      1            0
   29    11.43376   -19.80385    10.00000      1            0
   30     1.62500     2.81500   -17.00000      1            0
   31     8.43376    14.60770   -17.00000      1            0
   32    -3.25000     0.00000   -17.00000      1            0
   33   -16.87000     0.00000   -17.00000      1            0
   34     1.62500    -2.81500   -17.00000      1            0
   35     8.43376   -14.60770   -17.00000      1            0
   36     1.62500     2.81500   -16.20000      1            0
   37    11.43376    19.80385     9.13000      1            0
   38    -3.25000     0.00000   -16.20000      1            0
   39   -22.87000     0.00000     9.13000      1            0
   40     1.62500    -2.81500   -16.20000      1            0
   41    11.43376   -19.80385     9.13000      1            0
   42    14.43376    25.00000   -19.94000      1            0
   43   -28.86751     0.00000   -19.94000      1            0
   44    14.43376   -25.00000   -19.94000      1            0
---------------------- MEMBER CROSS-SECTION PROPERTIES -------------------------
             4   NPropSets      - Number of member property sets (-)
PropSetID    PropD         PropThck
   (-)        (m)            (m)
    1        6.50000        0.03000          ! Main Column
    2       12.00000        0.06000          ! Upper Columns
    3       24.00000        0.06000          ! Base Columns
    4        1.60000        0.01750          ! Pontoons
---------------------- SIMPLE HYDRODYNAMIC COEFFICIENTS (model 1) --------------
     SimplCd    SimplCdMG    SimplCa    SimplCaMG    SimplCp    SimplCpMG   SimplAxCd  SimplAxCdMG   SimplAxCa  SimplAxCaMG  SimplAxCp   SimplAxCpMG
       (-)         (-)         (-)         (-)         (-)         (-)         (-)         (-)         (-)         (-)         (-)         (-)
       0.00        0.00        0.00        0.00        1.00        1.00        0.00        0.00        0.00        0.00        1.00        1.00
---------------------- DEPTH-BASED HYDRODYNAMIC COEFFICIENTS (model 2) ---------
             0   NCoefDpth       - Number of depth-dependent coefficients (-)
Dpth      DpthCd   DpthCdMG   DpthCa   DpthCaMG       DpthCp   DpthCpMG   DpthAxCd   DpthAxCdMG   DpthAxCa   DpthAxCaMG   DpthAxCp   DpthAxCpMG
(m)       (-)      (-)        (-)      (-)            (-)      (-)        (-)        (-)          (-)        (-)          (-)        (-)
---------------------- MEMBER-BASED HYDRODYNAMIC COEFFICIENTS (model 3) --------
            25   NCoefMembers       - Number of member-based coefficients (-)
MemberID    MemberCd1     MemberCd2    MemberCdMG1   MemberCdMG2    MemberCa1     MemberCa2    MemberCaMG1   MemberCaMG2    MemberCp1     MemberCp2    MemberCpMG1   MemberCpMG2   MemberAxCd1   MemberAxCd2  MemberAxCdMG1 MemberAxCdMG2  MemberAxCa1   MemberAxCa2  MemberAxCaMG1 MemberAxCaMG2  MemberAxCp1  MemberAxCp2   MemberAxCpMG1   MemberAxCpMG2
   (-)         (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)
    1          0.56          0.56          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Main Column
    2          0.61          0.61          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Upper Column 1
    3          0.61          0.61          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Upper Column 2
    4          0.61          0.61          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Upper Column 3
    5          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base Column 1
    6          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base Column 2
    7          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base Column 3
   23          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base column cap 1
   24          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base column cap 2
   25          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base column cap 3
    8          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Upper 1
    9          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Upper 2
   10          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Upper 3
   11          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Lower 1
   12          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Lower 2
   13          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Lower 3
   14          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Upper 1
   15          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Upper 2
   16          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Upper 3
   17          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Lower 1
   18          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Lower 2
   19          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Lower 3
   20          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Cross Brace 1
   21          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Cross Brace 2
   22          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Cross Brace 3
-------------------- MEMBERS -------------------------------------------------
            25   NMembers       - Number of members (-)
MemberID  MJointID1  MJointID2  MPropSetID1  MPropSetID2  MDivSize   MCoefMod  PropPot   [MCoefMod=1: use simple coeff table, 2: use depth-based coeff table, 3: use member-based coeff table] [ PropPot/=0 if member is modeled with potential-flow theory]
  (-)        (-)        (-)         (-)          (-)        (m)      (switch)   (flag)
    1         1          2           1            1         1.0000      3        TRUE           ! Main Column
    2         3          4           2            2         1.0000      3        TRUE           ! Upper Column 1
    3         5          6           2            2         1.0000      3        TRUE           ! Upper Column 2
    4         7          8           2            2         1.0000      3        TRUE           ! Upper Column 3
    5        42          3           3            3         1.0000      3        TRUE           ! Base Column 1
    6        43          5           3            3         1.0000      3        TRUE           ! Base Column 2
    7        44          7           3            3         1.0000      3        TRUE           ! Base Column 3
   23         9         42           3            3         1.0000      3        TRUE           ! Base column cap 1
   24        10         43           3            3         1.0000      3        TRUE           ! Base column cap 2
   25        11         44           3            3         1.0000      3        TRUE           ! Base column cap 3
    8        12         13           4            4         1.0000      3        TRUE           ! Delta Pontoon, Upper 1
    9        14         15           4            4         1.0000      3        TRUE           ! Delta Pontoon, Upper 2
   10        16         17           4            4         1.0000      3        TRUE           ! Delta Pontoon, Upper 3
   11        18         19           4            4         1.0000      3        TRUE           ! Delta Pontoon, Lower 1
   12        20         21           4            4         1.0000      3        TRUE           ! Delta Pontoon, Lower 2
   13        22         23           4            4         1.0000      3        TRUE           ! Delta Pontoon, Lower 3
   14        24         25           4            4         1.0000      3        TRUE           ! Y Pontoon, Upper 1
   15        26         27           4            4         1.0000      3        TRUE           ! Y Pontoon, Upper 2
   16        28         29           4            4         1.0000      3        TRUE           ! Y Pontoon, Upper 3
   17        30         31           4            4         1.0000      3        TRUE           ! Y Pontoon, Lower 1
   18        32         33           4            4         1.0000      3        TRUE           ! Y Pontoon, Lower 2
   19        34         35           4            4         1.0000      3        TRUE           ! Y Pontoon, Lower 3
   20        36         37           4            4         1.0000      3        TRUE           ! Cross Brace 1
   21        38         39           4            4         1.0000      3        TRUE           ! Cross Brace 2
   22        40         41           4            4         1.0000      3        TRUE           ! Cross Brace 3
---------------------- FILLED MEMBERS ------------------------------------------
             2   NFillGroups     - Number of filled member groups (-) [If FillDens = DEFAULT, then FillDens = WtrDens; FillFSLoc is related to MSL2SWL]
FillNumM FillMList             FillFSLoc     FillDens
(-)      (-)                   (m)           (kg/m^3)
    3   2   3   4    -6.17           1025
    3   5   6   7   -14.89           1025
---------------------- MARINE GROWTH -------------------------------------------
             0   NMGDepths      - Number of marine-growth depths specified (-)
MGDpth     MGThck       MGDens
(m)        (m)         (kg/m^3)
---------------------- MEMBER OUTPUT LIST --------------------------------------
             0   NMOutputs      - Number of member outputs (-) [must be < 10]
MemberID   NOutLoc    NodeLocs [NOutLoc < 10; node locations are normalized distance from the start of the member, and must be >=0 and <= 1] [unused if NMOutputs=0]
  (-)        (-)        (-)
---------------------- JOINT OUTPUT LIST ---------------------------------------
             0   NJOutputs      - Number of joint outputs [Must be < 10]
   0           JOutLst        - List of JointIDs which are to be output (-)[unused if NJOutputs=0]
---------------------- OUTPUT --------------------------------------------------
True             HDSum          - Output a summary file [flag]
False            OutAll         - Output all user-specified member and joint loads (only at each member end, not interior locations) [flag]
             2   OutSwtch       - Output requested channels to: [1=Hydrodyn.out, 2=GlueCode.out, 3=both files]
"E15.7e2"       OutFmt         - Output format for numerical results (quoted string) [not checked for validity!]
"A11"            OutSFmt        - Output format for header strings (quoted string) [not checked for validity!]
---------------------- OUTPUT CHANNELS -----------------------------------------
"Wave1Elev"               - Wave elevation at the platform reference point (0,  0)
"HydroFxi"
"HydroFyi"
"HydroFzi"
"HydroMxi"
"HydroMyi"
"HydroMzi"
"B1Surge"
"B1Sway"
"B1Heave"
"B1Roll"
"B1Pitch"
"B1Yaw"
"B1TVxi"
"B1TVyi"
"B1TVzi"
"B1RVxi"
"B1RVyi"
"B1RVzi"
"B1TAxi"
"B1TAyi"
"B1TAzi"
"B1RAxi"
"B1RAyi"
"B1RAzi"
"B1WvsFxi"
"B1WvsFyi"
"B1WvsFzi"
"B1WvsMxi"
"B1WvsMyi"
"B1WvsMzi"
"B1HDSFxi"
"B1HDSFyi"
"B1HDSFzi"
"B1HDSMxi"
"B1HDSMyi"
"B1HDSMzi"
"B1RdtFxi"
"B1RdtFyi"
"B1RdtFzi"
"B1RdtMxi"
"B1RdtMyi"
"B1RdtMzi"
END of output channels and end of file. (the word "END" must appear in the first 3 columns of this line)

Non-Fluid-Filled:
ElastoDyn:

------- ELASTODYN for OpenFAST INPUT FILE -------------------------------------------
NREL 5.0 MW Baseline Wind Turbine for Use in Offshore Analysis. Properties from Dutch Offshore Wind Energy Converter (DOWEC) 6MW Pre-Design (10046_009.pdf) and REpower 5M 5MW (5m_uk.pdf).
---------------------- SIMULATION CONTROL --------------------------------------
False         Echo        - Echo input data to "<RootName>.ech" (flag)
          3   Method      - Integration method: {1: RK4, 2: AB4, or 3: ABM4} (-)
"DEFAULT"     DT          - Integration time step (s)
---------------------- ENVIRONMENTAL CONDITION ---------------------------------
    9.80665   Gravity     - Gravitational acceleration (m/s^2)
---------------------- DEGREES OF FREEDOM --------------------------------------
True          FlapDOF1    - First flapwise blade mode DOF (flag)
True          FlapDOF2    - Second flapwise blade mode DOF (flag)
True          EdgeDOF     - First edgewise blade mode DOF (flag)
False         TeetDOF     - Rotor-teeter DOF (flag) [unused for 3 blades]
True          DrTrDOF     - Drivetrain rotational-flexibility DOF (flag)
True          GenDOF      - Generator DOF (flag)
True          YawDOF      - Yaw DOF (flag)
True          TwFADOF1    - First fore-aft tower bending-mode DOF (flag)
True          TwFADOF2    - Second fore-aft tower bending-mode DOF (flag)
True          TwSSDOF1    - First side-to-side tower bending-mode DOF (flag)
True          TwSSDOF2    - Second side-to-side tower bending-mode DOF (flag)
True          PtfmSgDOF   - Platform horizontal surge translation DOF (flag)
True          PtfmSwDOF   - Platform horizontal sway translation DOF (flag)
True          PtfmHvDOF   - Platform vertical heave translation DOF (flag)
True          PtfmRDOF    - Platform roll tilt rotation DOF (flag)
True          PtfmPDOF    - Platform pitch tilt rotation DOF (flag)
True          PtfmYDOF    - Platform yaw rotation DOF (flag)
---------------------- INITIAL CONDITIONS --------------------------------------
          0   OoPDefl     - Initial out-of-plane blade-tip displacement (meters)
          0   IPDefl      - Initial in-plane blade-tip deflection (meters)
0   BlPitch(1)  - Blade 1 initial pitch (degrees)
0   BlPitch(2)  - Blade 2 initial pitch (degrees)
0   BlPitch(3)  - Blade 3 initial pitch (degrees)
          0   TeetDefl    - Initial or fixed teeter angle (degrees) [unused for 3 blades]
          0   Azimuth     - Initial azimuth angle for blade 1 (degrees)
0   RotSpeed    - Initial or fixed rotor speed (rpm)
0   NacYaw      - Initial or fixed nacelle-yaw angle (degrees)
          0   TTDspFA     - Initial fore-aft tower-top displacement (meters)
          0   TTDspSS     - Initial side-to-side tower-top displacement (meters)
0   PtfmSurge   - Initial or fixed horizontal surge translational displacement of platform (meters)
0   PtfmSway    - Initial or fixed horizontal sway translational displacement of platform (meters)
          0   PtfmHeave   - Initial or fixed vertical heave translational displacement of platform (meters)
0   PtfmRoll    - Initial or fixed roll tilt rotational displacement of platform (degrees)
5   PtfmPitch   - Initial or fixed pitch tilt rotational displacement of platform (degrees)
0   PtfmYaw     - Initial or fixed yaw rotational displacement of platform (degrees)
---------------------- TURBINE CONFIGURATION -----------------------------------
          3   NumBl       - Number of blades (-)
         63   TipRad      - The distance from the rotor apex to the blade tip (meters)
        1.5   HubRad      - The distance from the rotor apex to the blade root (meters)
       -2.5   PreCone(1)  - Blade 1 cone angle (degrees)
       -2.5   PreCone(2)  - Blade 2 cone angle (degrees)
       -2.5   PreCone(3)  - Blade 3 cone angle (degrees) [unused for 2 blades]
          0   HubCM       - Distance from rotor apex to hub mass [positive downwind] (meters)
          0   UndSling    - Undersling length [distance from teeter pin to the rotor apex] (meters) [unused for 3 blades]
          0   Delta3      - Delta-3 angle for teetering rotors (degrees) [unused for 3 blades]
          0   AzimB1Up    - Azimuth value to use for I/O when blade 1 points up (degrees)
    -5.0191   OverHang    - Distance from yaw axis to rotor apex [3 blades] or teeter pin [2 blades] (meters)
      1.912   ShftGagL    - Distance from rotor apex [3 blades] or teeter pin [2 blades] to shaft strain gages [positive for upwind rotors] (meters)
         -5   ShftTilt    - Rotor shaft tilt angle (degrees)
        1.9   NacCMxn     - Downwind distance from the tower-top to the nacelle CM (meters)
          0   NacCMyn     - Lateral  distance from the tower-top to the nacelle CM (meters)
       1.75   NacCMzn     - Vertical distance from the tower-top to the nacelle CM (meters)
   -3.09528   NcIMUxn     - Downwind distance from the tower-top to the nacelle IMU (meters)
          0   NcIMUyn     - Lateral  distance from the tower-top to the nacelle IMU (meters)
    2.23336   NcIMUzn     - Vertical distance from the tower-top to the nacelle IMU (meters)
    1.96256   Twr2Shft    - Vertical distance from the tower-top to the rotor shaft (meters)
       87.6   TowerHt     - Height of tower above ground level [onshore] or MSL [offshore] (meters)
         10   TowerBsHt   - Height of tower base above ground level [onshore] or MSL [offshore] (meters)
          0   PtfmCMxt    - Downwind distance from the ground level [onshore] or MSL [offshore] to the platform CM (meters)
          0   PtfmCMyt    - Lateral distance from the ground level [onshore] or MSL [offshore] to the platform CM (meters)
     -13.46   PtfmCMzt    - Vertical distance from the ground level [onshore] or MSL [offshore] to the platform CM (meters)
          0   PtfmRefzt   - Vertical distance from the ground level [onshore] or MSL [offshore] to the platform reference point (meters)
---------------------- MASS AND INERTIA ----------------------------------------
          0   TipMass(1)  - Tip-brake mass, blade 1 (kg)
          0   TipMass(2)  - Tip-brake mass, blade 2 (kg)
          0   TipMass(3)  - Tip-brake mass, blade 3 (kg) [unused for 2 blades]
      56780   HubMass     - Hub mass (kg)
     115926   HubIner     - Hub inertia about rotor axis [3 blades] or teeter axis [2 blades] (kg m^2)
    534.116   GenIner     - Generator inertia about HSS (kg m^2)
     240000   NacMass     - Nacelle mass (kg)
2.60789E+06   NacYIner    - Nacelle inertia about yaw axis (kg m^2)
          0   YawBrMass   - Yaw bearing mass (kg)
 1.3473E+07   PtfmMass    - Platform mass (kg)
  6.827E+09   PtfmRIner   - Platform inertia for roll tilt rotation about the platform CM (kg m^2)
  6.827E+09   PtfmPIner   - Platform inertia for pitch tilt rotation about the platform CM (kg m^2)
  1.226E+10   PtfmYIner   - Platform inertia for yaw rotation about the platform CM (kg m^2)
---------------------- BLADE ---------------------------------------------------
         17   BldNodes    - Number of blade nodes (per blade) used for analysis (-)
"../5MW_Baseline/NRELOffshrBsline5MW_Blade.dat"    BldFile(1)  - Name of file containing properties for blade 1 (quoted string)
"../5MW_Baseline/NRELOffshrBsline5MW_Blade.dat"    BldFile(2)  - Name of file containing properties for blade 2 (quoted string)
"../5MW_Baseline/NRELOffshrBsline5MW_Blade.dat"    BldFile(3)  - Name of file containing properties for blade 3 (quoted string) [unused for 2 blades]
---------------------- ROTOR-TEETER --------------------------------------------
          0   TeetMod     - Rotor-teeter spring/damper model {0: none, 1: standard, 2: user-defined from routine UserTeet} (switch) [unused for 3 blades]
          0   TeetDmpP    - Rotor-teeter damper position (degrees) [used only for 2 blades and when TeetMod=1]
          0   TeetDmp     - Rotor-teeter damping constant (N-m/(rad/s)) [used only for 2 blades and when TeetMod=1]
          0   TeetCDmp    - Rotor-teeter rate-independent Coulomb-damping moment (N-m) [used only for 2 blades and when TeetMod=1]
          0   TeetSStP    - Rotor-teeter soft-stop position (degrees) [used only for 2 blades and when TeetMod=1]
          0   TeetHStP    - Rotor-teeter hard-stop position (degrees) [used only for 2 blades and when TeetMod=1]
          0   TeetSSSp    - Rotor-teeter soft-stop linear-spring constant (N-m/rad) [used only for 2 blades and when TeetMod=1]
          0   TeetHSSp    - Rotor-teeter hard-stop linear-spring constant (N-m/rad) [used only for 2 blades and when TeetMod=1]
---------------------- DRIVETRAIN ----------------------------------------------
        100   GBoxEff     - Gearbox efficiency (%)
         97   GBRatio     - Gearbox ratio (-)
8.67637E+08   DTTorSpr    - Drivetrain torsional spring (N-m/rad)
  6.215E+06   DTTorDmp    - Drivetrain torsional damper (N-m/(rad/s))
---------------------- FURLING -------------------------------------------------
False         Furling     - Read in additional model properties for furling turbine (flag) [must currently be FALSE)
"unused"      FurlFile    - Name of file containing furling properties (quoted string) [unused when Furling=False]
---------------------- TOWER ---------------------------------------------------
         20   TwrNodes    - Number of tower nodes used for analysis (-)
"NRELOffshrBsline5MW_OC4DeepCwindSemi_ElastoDyn_Tower.dat"    TwrFile     - Name of file containing tower properties (quoted string)
---------------------- OUTPUT --------------------------------------------------
True          SumPrint    - Print summary data to "<RootName>.sum" (flag)
          2   OutFile     - Switch to determine where output will be placed: {1: in module output file only; 2: in glue code output file only; 3: both} (currently unused)
True          TabDelim    - Use tab delimiters in text tabular output file? (flag) (currently unused)
"ES10.3E2"    OutFmt      - Format used for text tabular output (except time).  Resulting field should be 10 characters. (quoted string) (currently unused)
          0   TStart      - Time to begin tabular output (s) (currently unused)
          1   DecFact     - Decimation factor for tabular output {1: output every time step} (-) (currently unused)
          1   NTwGages    - Number of tower nodes that have strain gages for output [0 to 9] (-)
         10   TwrGagNd    - List of tower nodes that have strain gages [1 to TwrNodes] (-) [unused if NTwGages=0]
          1   NBlGages    - Number of blade nodes that have strain gages for output [0 to 9] (-)
          9   BldGagNd    - List of blade nodes that have strain gages [1 to BldNodes] (-) [unused if NBlGages=0]
              OutList     - The next line(s) contains a list of output parameters.  See OutListParameters.xlsx for a listing of available output channels, (-)
"Azimuth"                 - Blade 1 azimuth angle
"RotSpeed"                - Low-speed shaft speed
"GenSpeed"                - High-speed shaft speed
"OoPDefl1"                - Blade 1 out-of-plane deflection
"IPDefl1"                 - Blade 1 in-plane     deflection
"TwstDefl1"               - Blade 1 tip twist
"BldPitch1"               - Blade 1 pitch angle
"TTDspFA"                 - Tower fore-aft     deflection
"TTDspSS"                 - Tower side-to-side deflection
"TTDspTwst"               - Tower top twist
"PtfmSurge"               - Platform translational surge displacement
"PtfmSway"                - Platform translational sway  displacement
"PtfmHeave"               - Platform translational heave displacement
"PtfmRoll"                - Platform rotational roll  displacement
"PtfmPitch"               - Platform rotational pitch displacement
"PtfmYaw"                 - Platform rotational yaw   displacement
"RootFxc1"                - Out-of-plane shear force at the root of blade 1
"RootFyc1"                - In-plane     shear force at the root of blade 1
"RootFzc1"                - Axial              force at the root of blade 1
"RootMxc1"                - In-plane     bending moment at the root of blade 1
"RootMyc1"                - Out-of-plane bending moment at the root of blade 1
"RootMzc1"                - Pitching             moment at the root of blade 1
"RotTorq"                 - Rotor torque
"LSSGagMya"               - Low-speed shaft 0- rotating bending moments at the main bearing
"LSSGagMza"               - Low-speed shaft 90-rotating bending moments at the main bearing
"YawBrFxp"                - Fore-aft     shear force at the top of the tower (not rotating with nacelle yaw)
"YawBrFyp"                - Side-to-side shear force at the top of the tower (not rotating with nacelle yaw)
"YawBrFzp"                - Vertical           force at the top of the tower (not rotating with nacelle yaw)
"YawBrMxp"                - Side-to-side bending moment at the top of the tower (not rotating with nacelle yaw)
"YawBrMyp"                - Fore-aft     bending moment at the top of the tower (not rotating with nacelle yaw)
"YawBrMzp"                - Yaw                  moment at the top of the tower (not rotating with nacelle yaw)
"TwrBsFxt"                - Fore-aft     shear force at the base of the tower (platform)
"TwrBsFyt"                - Side-to-side shear force at the base of the tower (platform)
"TwrBsFzt"                - Vertical           force at the base of the tower (platform)
"TwrBsMxt"                - Side-to-side bending moment at the base of the tower (platform)
"TwrBsMyt"                - Fore-aft     bending moment at the base of the tower (platform)
"TwrBsMzt"                - Yaw                  moment at the base of the tower (platform)
END of input file (the word "END" must appear in the first 3 columns of this last OutList line)
---------------------------------------------------------------------------------------

HydroDyn:

------- HydroDyn Input File ----------------------------------------------------
NREL 5.0 MW offshore baseline floating platform HydroDyn input properties for the OC4 Semi-submersible.
False            Echo           - Echo the input file data (flag)
---------------------- ENVIRONMENTAL CONDITIONS --------------------------------
          1025   WtrDens        - Water density (kg/m^3)
           200   WtrDpth        - Water depth (meters)
             0   MSL2SWL        - Offset between still-water level and mean sea level (meters) [positive upward; unused when WaveMod = 6; must be zero if PotMod=1 or 2]
---------------------- WAVES ---------------------------------------------------
             0   WaveMod        - Incident wave kinematics model {0: none=still water, 1: regular (periodic), 1P#: regular with user-specified phase, 2: JONSWAP/Pierson-Moskowitz spectrum (irregular), 3: White noise spectrum (irregular), 4: user-defined spectrum from routine UserWaveSpctrm (irregular), 5: Externally generated wave-elevation time series, 6: Externally generated full wave-kinematics time series [option 6 is invalid for PotMod/=0]} (switch)
             0   WaveStMod      - Model for stretching incident wave kinematics to instantaneous free surface {0: none=no stretching, 1: vertical stretching, 2: extrapolation stretching, 3: Wheeler stretching} (switch) [unused when WaveMod=0 or when PotMod/=0]
          4600   WaveTMax       - Analysis time for incident wave calculations (sec) [unused when WaveMod=0; determines WaveDOmega=2Pi/WaveTMax in the IFFT]
           0.2   WaveDT         - Time step for incident wave calculations     (sec) [unused when WaveMod=0; 0.1<=WaveDT<=1.0 recommended; determines WaveOmegaMax=Pi/WaveDT in the IFFT]
        1.2646   WaveHs         - Significant wave height of incident waves (meters) [used only when WaveMod=1, 2, or 3]
            10   WaveTp         - Peak-spectral period of incident waves       (sec) [used only when WaveMod=1 or 2]
"DEFAULT"        WavePkShp      - Peak-shape parameter of incident wave spectrum (-) or DEFAULT (string) [used only when WaveMod=2; use 1.0 for Pierson-Moskowitz]
      0.314159   WvLowCOff      - Low  cut-off frequency or lower frequency limit of the wave spectrum beyond which the wave spectrum is zeroed (rad/s) [unused when WaveMod=0, 1, or 6]
      1.570796   WvHiCOff       - High cut-off frequency or upper frequency limit of the wave spectrum beyond which the wave spectrum is zeroed (rad/s) [unused when WaveMod=0, 1, or 6]
             0   WaveDir        - Incident wave propagation heading direction                         (degrees) [unused when WaveMod=0 or 6]
             0   WaveDirMod     - Directional spreading function {0: none, 1: COS2S}                  (-)       [only used when WaveMod=2,3, or 4]
             1   WaveDirSpread  - Wave direction spreading coefficient ( > 0 )                        (-)       [only used when WaveMod=2,3, or 4 and WaveDirMod=1]
             1   WaveNDir       - Number of wave directions                                           (-)       [only used when WaveMod=2,3, or 4 and WaveDirMod=1; odd number only]
             0   WaveDirRange   - Range of wave directions (full range: WaveDir +/- 1/2*WaveDirRange) (degrees) [only used when WaveMod=2,3,or 4 and WaveDirMod=1]
     123456789   WaveSeed(1)    - First  random seed of incident waves [-2147483648 to 2147483647]    (-)       [unused when WaveMod=0, 5, or 6]
        RANLUX   WaveSeed(2)    - Second random seed of incident waves [-2147483648 to 2147483647] for intrinsic pRNG, or an alternative pRNG: "RanLux"    (-)       [unused when WaveMod=0, 5, or 6]
FALSE            WaveNDAmp      - Flag for normally distributed amplitudes                            (flag)    [only used when WaveMod=2, 3, or 4]
""               WvKinFile      - Root name of externally generated wave data file(s)        (quoted string)    [used only when WaveMod=5 or 6]
             1   NWaveElev      - Number of points where the incident wave elevations can be computed (-)       [maximum of 9 output locations]
             0   WaveElevxi     - List of xi-coordinates for points where the incident wave elevations can be output (meters) [NWaveElev points, separated by commas or white space; usused if NWaveElev = 0]
             0   WaveElevyi     - List of yi-coordinates for points where the incident wave elevations can be output (meters) [NWaveElev points, separated by commas or white space; usused if NWaveElev = 0]
---------------------- 2ND-ORDER WAVES ----------------------------------------- [unused with WaveMod=0 or 6]
FALSE            WvDiffQTF      - Full difference-frequency 2nd-order wave kinematics (flag)
FALSE            WvSumQTF       - Full summation-frequency  2nd-order wave kinematics (flag)
             0   WvLowCOffD     - Low  frequency cutoff used in the difference-frequencies (rad/s) [Only used with a difference-frequency method]
      1.256637   WvHiCOffD      - High frequency cutoff used in the difference-frequencies (rad/s) [Only used with a difference-frequency method]
      0.618319   WvLowCOffS     - Low  frequency cutoff used in the summation-frequencies  (rad/s) [Only used with a summation-frequency  method]
      3.141593   WvHiCOffS      - High frequency cutoff used in the summation-frequencies  (rad/s) [Only used with a summation-frequency  method]
---------------------- CURRENT ------------------------------------------------- [unused with WaveMod=6]
             0   CurrMod        - Current profile model {0: none=no current, 1: standard, 2: user-defined from routine UserCurrent} (switch)
             0   CurrSSV0       - Sub-surface current velocity at still water level  (m/s) [used only when CurrMod=1]
"DEFAULT"        CurrSSDir      - Sub-surface current heading direction (degrees) or DEFAULT (string) [used only when CurrMod=1]
            20   CurrNSRef      - Near-surface current reference depth            (meters) [used only when CurrMod=1]
             0   CurrNSV0       - Near-surface current velocity at still water level (m/s) [used only when CurrMod=1]
             0   CurrNSDir      - Near-surface current heading direction         (degrees) [used only when CurrMod=1]
             0   CurrDIV        - Depth-independent current velocity                 (m/s) [used only when CurrMod=1]
             0   CurrDIDir      - Depth-independent current heading direction    (degrees) [used only when CurrMod=1]
---------------------- FLOATING PLATFORM --------------------------------------- [unused with WaveMod=6]
             1   PotMod         - Potential-flow model {0: none=no potential flow, 1: frequency-to-time-domain transforms based on WAMIT output, 2: fluid-impulse theory (FIT)} (switch)
             1   ExctnMod       - Wave-excitation model {0: no wave-excitation calculation, 1: DFT, 2: state-space} (switch) [only used when PotMod=1; STATE-SPACE REQUIRES *.ssexctn INPUT FILE]
             1   RdtnMod        - Radiation memory-effect model {0: no memory-effect calculation, 1: convolution, 2: state-space} (switch) [only used when PotMod=1; STATE-SPACE REQUIRES *.ss INPUT FILE]
            60   RdtnTMax       - Analysis time for wave radiation kernel calculations (sec) [only used when PotMod=1 and RdtnMod=1; determines RdtnDOmega=Pi/RdtnTMax in the cosine transform; MAKE SURE THIS IS LONG ENOUGH FOR THE RADIATION IMPULSE RESPONSE FUNCTIONS TO DECAY TO NEAR-ZERO FOR THE GIVEN PLATFORM!]
        0.0125   RdtnDT         - Time step for wave radiation kernel calculations (sec) [only used when PotMod=1 and ExctnMod>1 or RdtnMod>0; DT<=RdtnDT<=0.1 recommended; determines RdtnOmegaMax=Pi/RdtnDT in the cosine transform]
             1   NBody          - Number of WAMIT bodies to be used (-) [>=1; only used when PotMod=1. If NBodyMod=1, the WAMIT data contains a vector of size 6*NBody x 1 and matrices of size 6*NBody x 6*NBody; if NBodyMod>1, there are NBody sets of WAMIT data each with a vector of size 6 x 1 and matrices of size 6 x 6]
             1   NBodyMod       - Body coupling model {1: include coupling terms between each body and NBody in HydroDyn equals NBODY in WAMIT, 2: neglect coupling terms between each body and NBODY=1 with XBODY=0 in WAMIT, 3: Neglect coupling terms between each body and NBODY=1 with XBODY=/0 in WAMIT} (switch) [only used when PotMod=1]
"../5MW_Baseline/HydroData/marin_semi"    PotFile       - Root name of potential-flow model data; WAMIT output files containing the linear, nondimensionalized, hydrostatic restoring matrix (.hst), frequency-dependent hydrodynamic added mass matrix and damping matrix (.1), and frequency- and direction-dependent wave excitation force vector per unit wave amplitude (.3) (quoted string) [1 to NBody if NBodyMod>1] [MAKE SURE THE FREQUENCIES INHERENT IN THESE WAMIT FILES SPAN THE PHYSICALLY-SIGNIFICANT RANGE OF FREQUENCIES FOR THE GIVEN PLATFORM; THEY MUST CONTAIN THE ZERO- AND INFINITE-FREQUENCY LIMITS!]
             1   WAMITULEN      - Characteristic body length scale used to redimensionalize WAMIT output (meters) [1 to NBody if NBodyMod>1] [only used when PotMod=1]
           0.0   PtfmRefxt      - The xt offset of the body reference point(s) from (0,0,0) (meters) [1 to NBody] [only used when PotMod=1]
           0.0   PtfmRefyt      - The yt offset of the body reference point(s) from (0,0,0) (meters) [1 to NBody] [only used when PotMod=1]
           0.0   PtfmRefzt      - The zt offset of the body reference point(s) from (0,0,0) (meters) [1 to NBody] [only used when PotMod=1. If NBodyMod=2,PtfmRefzt=0.0]
           0.0   PtfmRefztRot   - The rotation about zt of the body reference frame(s) from xt/yt (degrees) [1 to NBody] [only used when PotMod=1]
         13917   PtfmVol0       - Displaced volume of water when the body is in its undisplaced position (m^3) [1 to NBody] [only used when PotMod=1; USE THE SAME VALUE COMPUTED BY WAMIT AS OUTPUT IN THE .OUT FILE!]
           0.0   PtfmCOBxt      - The xt offset of the center of buoyancy (COB) from (0,0) (meters) [1 to NBody] [only used when PotMod=1]
           0.0   PtfmCOByt      - The yt offset of the center of buoyancy (COB) from (0,0) (meters) [1 to NBody] [only used when PotMod=1]
---------------------- 2ND-ORDER FLOATING PLATFORM FORCES ---------------------- [unused with WaveMod=0 or 6, or PotMod=0 or 2]
             0   MnDrift        - Mean-drift 2nd-order forces computed                                       {0: None; [7, 8, 9, 10, 11, or 12]: WAMIT file to use} [Only one of MnDrift, NewmanApp, or DiffQTF can be non-zero. If NBody>1, MnDrift  /=8]
             0   NewmanApp      - Mean- and slow-drift 2nd-order forces computed with Newman's approximation {0: None; [7, 8, 9, 10, 11, or 12]: WAMIT file to use} [Only one of MnDrift, NewmanApp, or DiffQTF can be non-zero. If NBody>1, NewmanApp/=8. Used only when WaveDirMod=0]
            12   DiffQTF        - Full difference-frequency 2nd-order forces computed with full QTF          {0: None; [10, 11, or 12]: WAMIT file to use}          [Only one of MnDrift, NewmanApp, or DiffQTF can be non-zero]
            12   SumQTF         - Full summation -frequency 2nd-order forces computed with full QTF          {0: None; [10, 11, or 12]: WAMIT file to use}
---------------------- PLATFORM ADDITIONAL STIFFNESS AND DAMPING  -------------- [unused with PotMod=0 or 2]
             0   AddF0    - Additional preload (N, N-m) [If NBodyMod=1, one size 6*NBody x 1 vector; if NBodyMod>1, NBody size 6 x 1 vectors]
             0
             0
             0
             0
             0
             0             0             0             0             0             0   AddCLin  - Additional linear stiffness (N/m, N/rad, N-m/m, N-m/rad)                     [If NBodyMod=1, one size 6*NBody x 6*NBody matrix; if NBodyMod>1, NBody size 6 x 6 matrices]
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0   AddBLin  - Additional linear damping(N/(m/s), N/(rad/s), N-m/(m/s), N-m/(rad/s))        [If NBodyMod=1, one size 6*NBody x 6*NBody matrix; if NBodyMod>1, NBody size 6 x 6 matrices]
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0   AddBQuad - Additional quadratic drag(N/(m/s)^2, N/(rad/s)^2, N-m(m/s)^2, N-m/(rad/s)^2) [If NBodyMod=1, one size 6*NBody x 6*NBody matrix; if NBodyMod>1, NBody size 6 x 6 matrices]
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
             0             0             0             0             0             0
---------------------- AXIAL COEFFICIENTS --------------------------------------
             2   NAxCoef        - Number of axial coefficients (-)
AxCoefID  AxCd     AxCa     AxCp
   (-)    (-)      (-)      (-)
    1     0.00     0.00     1.00
    2     9.60     0.00     1.00
---------------------- MEMBER JOINTS -------------------------------------------
            44   NJoints        - Number of joints (-)   [must be exactly 0 or at least 2]
JointID   Jointxi     Jointyi     Jointzi  JointAxID   JointOvrlp   [JointOvrlp= 0: do nothing at joint, 1: eliminate overlaps by calculating super member]
   (-)     (m)         (m)         (m)        (-)       (switch)
    1     0.00000     0.00000   -20.00000      1            0
    2     0.00000     0.00000    10.00000      1            0
    3    14.43376    25.00000   -14.00000      1            0
    4    14.43376    25.00000    12.00000      1            0
    5   -28.86751     0.00000   -14.00000      1            0
    6   -28.86751     0.00000    12.00000      1            0
    7    14.43376   -25.00000   -14.00000      1            0
    8    14.43376   -25.00000    12.00000      1            0
    9    14.43375    25.00000   -20.00000      2            0
   10   -28.86750     0.00000   -20.00000      2            0
   11    14.43375   -25.00000   -20.00000      2            0
   12     9.23760    22.00000    10.00000      1            0
   13   -23.67130     3.00000    10.00000      1            0
   14   -23.67130    -3.00000    10.00000      1            0
   15     9.23760   -22.00000    10.00000      1            0
   16    14.43375   -19.00000    10.00000      1            0
   17    14.43375    19.00000    10.00000      1            0
   18     4.04145    19.00000   -17.00000      1            0
   19   -18.47520     6.00000   -17.00000      1            0
   20   -18.47520    -6.00000   -17.00000      1            0
   21     4.04145   -19.00000   -17.00000      1            0
   22    14.43375   -13.00000   -17.00000      1            0
   23    14.43375    13.00000   -17.00000      1            0
   24     1.62500     2.81500    10.00000      1            0
   25    11.43376    19.80385    10.00000      1            0
   26    -3.25000     0.00000    10.00000      1            0
   27   -22.87000     0.00000    10.00000      1            0
   28     1.62500    -2.81500    10.00000      1            0
   29    11.43376   -19.80385    10.00000      1            0
   30     1.62500     2.81500   -17.00000      1            0
   31     8.43376    14.60770   -17.00000      1            0
   32    -3.25000     0.00000   -17.00000      1            0
   33   -16.87000     0.00000   -17.00000      1            0
   34     1.62500    -2.81500   -17.00000      1            0
   35     8.43376   -14.60770   -17.00000      1            0
   36     1.62500     2.81500   -16.20000      1            0
   37    11.43376    19.80385     9.13000      1            0
   38    -3.25000     0.00000   -16.20000      1            0
   39   -22.87000     0.00000     9.13000      1            0
   40     1.62500    -2.81500   -16.20000      1            0
   41    11.43376   -19.80385     9.13000      1            0
   42    14.43376    25.00000   -19.94000      1            0
   43   -28.86751     0.00000   -19.94000      1            0
   44    14.43376   -25.00000   -19.94000      1            0
---------------------- MEMBER CROSS-SECTION PROPERTIES -------------------------
             4   NPropSets      - Number of member property sets (-)
PropSetID    PropD         PropThck
   (-)        (m)            (m)
    1        6.50000        0.03000          ! Main Column
    2       12.00000        0.06000          ! Upper Columns
    3       24.00000        0.06000          ! Base Columns
    4        1.60000        0.01750          ! Pontoons
---------------------- SIMPLE HYDRODYNAMIC COEFFICIENTS (model 1) --------------
     SimplCd    SimplCdMG    SimplCa    SimplCaMG    SimplCp    SimplCpMG   SimplAxCd  SimplAxCdMG   SimplAxCa  SimplAxCaMG  SimplAxCp   SimplAxCpMG
       (-)         (-)         (-)         (-)         (-)         (-)         (-)         (-)         (-)         (-)         (-)         (-)
       0.00        0.00        0.00        0.00        1.00        1.00        0.00        0.00        0.00        0.00        1.00        1.00
---------------------- DEPTH-BASED HYDRODYNAMIC COEFFICIENTS (model 2) ---------
             0   NCoefDpth       - Number of depth-dependent coefficients (-)
Dpth      DpthCd   DpthCdMG   DpthCa   DpthCaMG       DpthCp   DpthCpMG   DpthAxCd   DpthAxCdMG   DpthAxCa   DpthAxCaMG   DpthAxCp   DpthAxCpMG
(m)       (-)      (-)        (-)      (-)            (-)      (-)        (-)        (-)          (-)        (-)          (-)        (-)
---------------------- MEMBER-BASED HYDRODYNAMIC COEFFICIENTS (model 3) --------
            25   NCoefMembers       - Number of member-based coefficients (-)
MemberID    MemberCd1     MemberCd2    MemberCdMG1   MemberCdMG2    MemberCa1     MemberCa2    MemberCaMG1   MemberCaMG2    MemberCp1     MemberCp2    MemberCpMG1   MemberCpMG2   MemberAxCd1   MemberAxCd2  MemberAxCdMG1 MemberAxCdMG2  MemberAxCa1   MemberAxCa2  MemberAxCaMG1 MemberAxCaMG2  MemberAxCp1  MemberAxCp2   MemberAxCpMG1   MemberAxCpMG2
   (-)         (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)           (-)
    1          0.56          0.56          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Main Column
    2          0.61          0.61          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Upper Column 1
    3          0.61          0.61          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Upper Column 2
    4          0.61          0.61          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Upper Column 3
    5          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base Column 1
    6          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base Column 2
    7          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base Column 3
   23          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base column cap 1
   24          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base column cap 2
   25          0.68          0.68          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Base column cap 3
    8          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Upper 1
    9          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Upper 2
   10          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Upper 3
   11          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Lower 1
   12          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Lower 2
   13          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Delta Pontoon, Lower 3
   14          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Upper 1
   15          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Upper 2
   16          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Upper 3
   17          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Lower 1
   18          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Lower 2
   19          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Y Pontoon, Lower 3
   20          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Cross Brace 1
   21          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Cross Brace 2
   22          0.63          0.63          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00          0.00         ! Cross Brace 3
-------------------- MEMBERS -------------------------------------------------
            25   NMembers       - Number of members (-)
MemberID  MJointID1  MJointID2  MPropSetID1  MPropSetID2  MDivSize   MCoefMod  PropPot   [MCoefMod=1: use simple coeff table, 2: use depth-based coeff table, 3: use member-based coeff table] [ PropPot/=0 if member is modeled with potential-flow theory]
  (-)        (-)        (-)         (-)          (-)        (m)      (switch)   (flag)
    1         1          2           1            1         1.0000      3        TRUE           ! Main Column
    2         3          4           2            2         1.0000      3        TRUE           ! Upper Column 1
    3         5          6           2            2         1.0000      3        TRUE           ! Upper Column 2
    4         7          8           2            2         1.0000      3        TRUE           ! Upper Column 3
    5        42          3           3            3         1.0000      3        TRUE           ! Base Column 1
    6        43          5           3            3         1.0000      3        TRUE           ! Base Column 2
    7        44          7           3            3         1.0000      3        TRUE           ! Base Column 3
   23         9         42           3            3         1.0000      3        TRUE           ! Base column cap 1
   24        10         43           3            3         1.0000      3        TRUE           ! Base column cap 2
   25        11         44           3            3         1.0000      3        TRUE           ! Base column cap 3
    8        12         13           4            4         1.0000      3        TRUE           ! Delta Pontoon, Upper 1
    9        14         15           4            4         1.0000      3        TRUE           ! Delta Pontoon, Upper 2
   10        16         17           4            4         1.0000      3        TRUE           ! Delta Pontoon, Upper 3
   11        18         19           4            4         1.0000      3        TRUE           ! Delta Pontoon, Lower 1
   12        20         21           4            4         1.0000      3        TRUE           ! Delta Pontoon, Lower 2
   13        22         23           4            4         1.0000      3        TRUE           ! Delta Pontoon, Lower 3
   14        24         25           4            4         1.0000      3        TRUE           ! Y Pontoon, Upper 1
   15        26         27           4            4         1.0000      3        TRUE           ! Y Pontoon, Upper 2
   16        28         29           4            4         1.0000      3        TRUE           ! Y Pontoon, Upper 3
   17        30         31           4            4         1.0000      3        TRUE           ! Y Pontoon, Lower 1
   18        32         33           4            4         1.0000      3        TRUE           ! Y Pontoon, Lower 2
   19        34         35           4            4         1.0000      3        TRUE           ! Y Pontoon, Lower 3
   20        36         37           4            4         1.0000      3        TRUE           ! Cross Brace 1
   21        38         39           4            4         1.0000      3        TRUE           ! Cross Brace 2
   22        40         41           4            4         1.0000      3        TRUE           ! Cross Brace 3
---------------------- FILLED MEMBERS ------------------------------------------
             0   NFillGroups     - Number of filled member groups (-) [If FillDens = DEFAULT, then FillDens = WtrDens; FillFSLoc is related to MSL2SWL]
FillNumM FillMList             FillFSLoc     FillDens
(-)      (-)                   (m)           (kg/m^3)
---------------------- MARINE GROWTH -------------------------------------------
             0   NMGDepths      - Number of marine-growth depths specified (-)
MGDpth     MGThck       MGDens
(m)        (m)         (kg/m^3)
---------------------- MEMBER OUTPUT LIST --------------------------------------
             0   NMOutputs      - Number of member outputs (-) [must be < 10]
MemberID   NOutLoc    NodeLocs [NOutLoc < 10; node locations are normalized distance from the start of the member, and must be >=0 and <= 1] [unused if NMOutputs=0]
  (-)        (-)        (-)
---------------------- JOINT OUTPUT LIST ---------------------------------------
             0   NJOutputs      - Number of joint outputs [Must be < 10]
   0           JOutLst        - List of JointIDs which are to be output (-)[unused if NJOutputs=0]
---------------------- OUTPUT --------------------------------------------------
True             HDSum          - Output a summary file [flag]
False            OutAll         - Output all user-specified member and joint loads (only at each member end, not interior locations) [flag]
             2   OutSwtch       - Output requested channels to: [1=Hydrodyn.out, 2=GlueCode.out, 3=both files]
"E15.7e2"       OutFmt         - Output format for numerical results (quoted string) [not checked for validity!]
"A11"            OutSFmt        - Output format for header strings (quoted string) [not checked for validity!]
---------------------- OUTPUT CHANNELS -----------------------------------------
"Wave1Elev"               - Wave elevation at the platform reference point (0,  0)
"HydroFxi"
"HydroFyi"
"HydroFzi"
"HydroMxi"
"HydroMyi"
"HydroMzi"
"B1Surge"
"B1Sway"
"B1Heave"
"B1Roll"
"B1Pitch"
"B1Yaw"
"B1TVxi"
"B1TVyi"
"B1TVzi"
"B1RVxi"
"B1RVyi"
"B1RVzi"
"B1TAxi"
"B1TAyi"
"B1TAzi"
"B1RAxi"
"B1RAyi"
"B1RAzi"
"B1WvsFxi"
"B1WvsFyi"
"B1WvsFzi"
"B1WvsMxi"
"B1WvsMyi"
"B1WvsMzi"
"B1HDSFxi"
"B1HDSFyi"
"B1HDSFzi"
"B1HDSMxi"
"B1HDSMyi"
"B1HDSMzi"
"B1RdtFxi"
"B1RdtFyi"
"B1RdtFzi"
"B1RdtMxi"
"B1RdtMyi"
"B1RdtMzi"
END of output channels and end of file. (the word "END" must appear in the first 3 columns of this line)

Dear Brendan,

These files look like I would expect them to. Your model with the fluid fill modeled in HydroDyn matches the model provided in the OpenFAST r-test. And your model with the fluid fill modeled in ElastoDyn matches the mass, center of mass, and inertia documented in the OC4-DeepCwind semisubmersible specifications report.

I’m curious if there is a small error in the rigid-body equivalent mass, center of mass, or inertia properties. It may be worth double checking that the mass, center of mass, and inertia documented in the OC4-DeepCwind specifications report match those when when the fluid mass/inertia is added to the steel mass/inertia, assuming that the fluid is a solid cylinder, e.g., using the mass / inertia properties from: en.wikipedia.org/wiki/List_of_m … of_inertia.

Best regards,