Dear @Jason.Jonkman

I am having two problems that I would like to get help from the experts.

The first one is that when I run the turbulent wind irregular wave condition I get an error but it doesn’t affect the operation, I guess there is something wrong with my parameters somewhere, I read that someone mentioned this earlier and I changed the initial conditions but it still gives me an error. Here are my parameters.

------- AERODYN v15.03.* INPUT FILE ------------------------------------------------

IEA 15 MW Offshore Reference Turbine

====== General Options ============================================================================

False Echo - Echo the input to “.AD.ech”? (flag)

default DTAero - Time interval for aerodynamic calculations {or “default”} (s)

1 WakeMod - Type of wake/induction model (switch) {0=none, 1=BEMT, 2=DBEMT, 3=OLAF} [WakeMod cannot be 2 or 3 when linearizing]

2 AFAeroMod - Type of blade airfoil aerodynamics model (switch) {1=steady model, 2=Beddoes-Leishman unsteady model} [AFAeroMod must be 1 when linearizing]

1 TwrPotent - Type tower influence on wind based on potential flow around the tower (switch) {0=none, 1=baseline potential flow, 2=potential flow with Bak correction}

1 TwrShadow - Calculate tower influence on wind based on downstream tower shadow (switch) {0=none, 1=Powles model, 2=Eames model}

True TwrAero - Calculate tower aerodynamic loads? (flag)

False FrozenWake - Assume frozen wake during linearization? (flag) [used only when WakeMod=1 and when linearizing]

False CavitCheck - Perform cavitation check? (flag) [AFAeroMod must be 1 when CavitCheck=true]

False Buoyancy - Include buoyancy effects? (flag)

False CompAA - Flag to compute AeroAcoustics calculation [only used when WakeMod=1 or 2]

AeroAcousticsInput.dat AA_InputFile - AeroAcoustics input file [used only when CompAA=true]

====== Environmental Conditions ===================================================================

“default” AirDens - Air density (kg/m^3)

“default” KinVisc - Kinematic air viscosity (m^2/s)

“default” SpdSound - Speed of sound (m/s)

“default” Patm - Atmospheric pressure ¶ [used only when CavitCheck=True]

“default” Pvap - Vapour pressure of fluid ¶ [used only when CavitCheck=True]

====== Blade-Element/Momentum Theory Options ====================================================== [used only when WakeMod=1]

2 SkewMod - Type of skewed-wake correction model (switch) {1=uncoupled, 2=Pitt/Peters, 3=coupled} [unused when WakeMod=0 or 3]

default SkewModFactor - Constant used in Pitt/Peters skewed wake model {or “default” is 15/32*pi} (-) [used only when SkewMod=2; unused when WakeMod=0 or 3]

True TipLoss - Use the Prandtl tip-loss model? (flag) [unused when WakeMod=0 or 3]

True HubLoss - Use the Prandtl hub-loss model? (flag) [unused when WakeMod=0 or 3]

True TanInd - Include tangential induction in BEMT calculations? (flag) [unused when WakeMod=0 or 3]

True AIDrag - Include the drag term in the axial-induction calculation? (flag) [unused when WakeMod=0 or 3]

True TIDrag - Include the drag term in the tangential-induction calculation? (flag) [unused when WakeMod=0,3 or TanInd=FALSE]

default IndToler - Convergence tolerance for BEMT nonlinear solve residual equation {or “default”} (-) [unused when WakeMod=0 or 3]

500 MaxIter - Maximum number of iteration steps (-) [unused when WakeMod=0]

====== Dynamic Blade-Element/Momentum Theory Options ====================================================== [used only when WakeMod=1]

2 DBEMT_Mod - Type of dynamic BEMT (DBEMT) model {1=constant tau1, 2=time-dependent tau1} (-) [used only when WakeMod=2]

29.03 tau1_const - Time constant for DBEMT (s) [used only when WakeMod=2 and DBEMT_Mod=1]

====== OLAF – cOnvecting LAgrangian Filaments (Free Vortex Wake) Theory Options ================== [used only when WakeMod=3]

…/IEA-15-240-RWT-OLAF/IEA-15-240-RWT_OLAF.dat OLAFInputFileName - Input file for OLAF [used only when WakeMod=3]

====== Beddoes-Leishman Unsteady Airfoil Aerodynamics Options ===================================== [used only when AFAeroMod=2]

3 UAMod - Unsteady Aero Model Switch (switch) {1=Baseline model (Original), 2=Gonzalez’s variant (changes in Cn,Cc,Cm), 3=Minnema/Pierce variant (changes in Cc and Cm)} [used only when AFAeroMod=2]

True FLookup - Flag to indicate whether a lookup for f’ will be calculated (TRUE) or whether best-fit exponential equations will be used (FALSE); if FALSE S1-S4 must be provided in airfoil input files (flag) [used only when AFAeroMod=2]

0.1 UAStartRad - Starting radius for dynamic stall (fraction of rotor radius) [used only when AFAeroMod=2]

1.0 UAEndRad - Ending radius for dynamic stall (fraction of rotor radius) [used only when AFAeroMod=2]

The second one is that these two features were added inside the V2 version, I’m using OPENFAST version 3.5.1, which should have integrated these two features, and would like to know why this problem occurs.

------- ELASTODYN v1.03.* INPUT FILE -------------------------------------------

IEA 15 MW offshore reference model on UMaine VolturnUS-S semi-submersible floating platform

---------------------- INITIAL CONDITIONS --------------------------------------

0 OoPDefl - Initial out-of-plane blade-tip displacement (meters)

0 IPDefl - Initial in-plane blade-tip deflection (meters)

3 BlPitch(1) - Blade 1 initial pitch (degrees)

3 BlPitch(2) - Blade 2 initial pitch (degrees)

3 BlPitch(3) - Blade 3 initial pitch (degrees) [unused for 2 blades]

0 TeetDefl - Initial or fixed teeter angle (degrees) [unused for 3 blades]

0 Azimuth - Initial azimuth angle for blade 1 (degrees)

5 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)

0 PtfmPitch - Initial or fixed pitch tilt rotational displacement of platform (degrees)

0 PtfmYaw - Initial or fixed yaw rotational displacement of platform (degrees)

---------TurbSim v2.00.* Input File------------------------

--------Turbine/Model Specifications-----------------------

21 NumGrid_Z - Vertical grid-point matrix dimension

21 NumGrid_Y - Horizontal grid-point matrix dimension

0.05 TimeStep - Time step [seconds]

4000 AnalysisTime - Length of analysis time series [seconds] (program will add time if necessary: AnalysisTime = MAX(AnalysisTime, UsableTime+GridWidth/MeanHHWS) )

“ALL” UsableTime - Usable length of output time series [seconds] (program will add GridWidth/MeanHHWS seconds unless UsableTime is “ALL”)

150.0 HubHt - Hub height [m] (should be > 0.5GridHeight)(RotorRadius+ShaftLength))

295.0 GridHeight - Grid height [m]

300.0 GridWidth - Grid width [m] (should be >= 2

0.0 VFlowAng - Vertical mean flow (uptilt) angle [degrees]

0.0 HFlowAng - Horizontal mean flow (skew) angle [degrees]

--------Meteorological Boundary Conditions-------------------

“IECKAI” TurbModel - Turbulence model (“IECKAI”,“IECVKM”,“GP_LLJ”,“NWTCUP”,“SMOOTH”,“WF_UPW”,“WF_07D”,“WF_14D”,“TIDAL”,“API”,“USRINP”,“TIMESR”, or “NONE”)

“unused” UserFile - Name of the file that contains inputs for user-defined spectra or time series inputs (used only for “USRINP” and “TIMESR” models)

“1-ED3” IECstandard - Number of IEC 61400-x standard (x=1,2, or 3 with optional 61400-1 edition number (i.e. “1-Ed2”) )

B IECturbc - IEC turbulence characteristic (“A”, “B”, “C” or the turbulence intensity in percent) (“KHTEST” option with NWTCUP model, not used for other models)

NTM IEC_WindType - IEC turbulence type (“NTM”=normal, “xETM”=extreme turbulence, “xEWM1”=extreme 1-year wind, “xEWM50”=extreme 50-year wind, where x=wind turbine class 1, 2, or 3)

“default” ETMc - IEC Extreme Turbulence Model “c” parameter [m/s]

“PL” WindProfileType - Velocity profile type (“LOG”;“PL”=power law;“JET”;“H2L”=Log law for TIDAL model;“API”;“USR”;“TS”;“IEC”=PL on rotor disk, LOG elsewhere; or “default”)

“unused” ProfileFile - Name of the file that contains input profiles for WindProfileType=“USR” and/or TurbModel=“USRVKM” [-]

150.0 RefHt - Height of the reference velocity (URef) [m]

6 URef - Mean (total) velocity at the reference height [m/s] (or “default” for JET velocity profile) [must be 1-hr mean for API model; otherwise is the mean over AnalysisTime seconds]

“default” ZJetMax - Jet height [m] (used only for JET velocity profile, valid 70-490 m)

0.11 PLExp - Power law exponent [-] (or “default”)

“default” Z0 - Surface roughness length [m] (or “default”)

The second one is that these two features were added inside the V2 version, I’m using OPENFAST version 3.5.1, which should have integrated these two features, and would like to know why this problem occurs.

--------------------- MoorDyn Input File ------------------------------------

MoorDyn v2 sample input file

---------------------- LINE TYPES -----------------------------------

TypeName Diam Mass/m EA BA/-zeta EI Cd Ca CdAx CaAx

(name) (m) (kg/m) (N) (N-s/-) (N-m^2) (-) (-) (-) (-)

Chain 0.333 685.0 3.27E+09 -1 0 1.11 0.82 0.2 0.27

---------------------- ROD TYPES ------------------------------------

TypeName Diam Mass/m Cd Ca CdEnd CaEnd

(name) (m) (kg/m) (-) (-) (-) (-)

---------------------- BODIES ---------------------------------------

ID Attachment X0 Y0 Z0 r0 p0 y0 Mass CG* I* Volume CdA* Ca*

(#) (word) (m) (m) (m) (deg) (deg) (deg) (kg) (m) (kg-m^2) (m^3) (m^2) (-)

---------------------- RODS ----------------------------------------

ID RodType Attachment Xa Ya Za Xb Yb Zb NumSegs RodOutputs

(#) (name) (word/ID) (m) (m) (m) (m) (m) (m) (-) (-)

---------------------- POINTS ---------------------------------------

ID Attachment X Y Z Mass Volume CdA Ca

(#) (word/ID) (m) (m) (m) (kg) (mˆ3) (m^2) (-)

1 Vessel -58.000 0.000 -14.000 0 0 0 0

2 Fixed -837.600 0.000 -200.000 0 0 0 0

3 Vessel 29.000 50.229 -14.000 0 0 0 0

4 Fixed 418.800 725.383 -200.000 0 0 0 0

5 Vessel 29.000 -50.229 -14.000 0 0 0 0

6 Fixed 418.800 -725.383 -200.000 0 0 0 0

---------------------- LINES ----------------------------------------

ID LineType AttachA AttachB UnstrLen NumSegs LineOutputs

(#) (name) (ID) (ID) (m) (-) (-)

1 Chain 2 1 850.00 100 -

2 Chain 4 3 850.00 100 -

3 Chain 6 5 850.00 100 -

---------------------- OPTIONS -----------------------------------------

0.001 dtM time step to use in mooring integration (s)

3000000 kbot bottom stiffness (Pa/m)

300000 cbot bottom damping (Pa-s/m)

0.1 dtIC time interval for analyzing convergence during IC gen (s)

60 TmaxIC max time for ic gen (s)

0.001 threshIC threshold for IC convergence (-)

“Moordyn Water Kinematics.dat” WaveKin Water Kinematics(-)

1.0 FrictionCoefficient The seabed friction coefficient

---------------------- OUTPUTS -----------------------------------------

FAIRTEN1

FAIRTEN2

FAIRTEN3

ANCHTEN1

ANCHTEN2

ANCHTEN3

END

Best regards，