FAST run error when BldNodes changed

[b]Hi everyone,

I hope to do some simulations on a 2MW wind turbine by using FAST.
As the first step, I changed some parameters of the NREL WP-1.5MW (test.fst) to that of my 2MW wind turbine, as follows,

The primary input file:[/b]

[code]-------------------------------------------------------------------------------------- FAST INPUT FILE --------------------------------------------------------
FAST certification Test #13: WindPACT 1.5 MW Baseline with many DOFs with VS and VP and FF turbulence.
Model properties from “InputData1.5A08V07adm.xls” (from C. Hansen) with bugs removed. Compatible with FAST v7.02.00.
---------------------- SIMULATION CONTROL --------------------------------------
False Echo - Echo input data to “echo.out” (flag)
1 ADAMSPrep - ADAMS preprocessor mode {1: Run FAST, 2: use FAST as a preprocessor to create an ADAMS model, 3: do both} (switch)
1 AnalMode - Analysis mode {1: Run a time-marching simulation, 2: create a periodic linearized model} (switch)
3 NumBl - Number of blades (-)
700.0 TMax - Total run time (s)
0.005 DT - Integration time step (s)

---------------------- ENVIRONMENTAL CONDITIONS --------------------------------
9.80665 Gravity - Gravitational acceleration (m/s^2)
---------------------- FEATURE FLAGS -------------------------------------------
False FlapDOF1 - First flapwise blade mode DOF (flag)
False FlapDOF2 - Second flapwise blade mode DOF (flag)
False 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)
False YawDOF - Yaw DOF (flag)
False TwFADOF1 - First fore-aft tower bending-mode DOF (flag)
False TwFADOF2 - Second fore-aft tower bending-mode DOF (flag)
False TwSSDOF1 - First side-to-side tower bending-mode DOF (flag)
False TwSSDOF2 - Second side-to-side tower bending-mode DOF (flag)
True CompAero - Compute aerodynamic forces (flag)
False CompNoise - Compute aerodynamic noise (flag)

---------------------- TURBINE CONFIGURATION -----------------------------------
46.451 TipRad - The distance from the rotor apex to the blade tip (meters)!!!
1.17 HubRad - The distance from the rotor apex to the blade root (meters)!!!
1 PSpnElN - Number of the innermost blade element which is still part of the pitchable portion of the blade for partial-span pitch control [1 to BldNodes] [CURRENTLY IGNORED] (-)
0.0 UndSling - Undersling length [distance from teeter pin to the rotor apex] (meters) [unused for 3 blades]
0.0 HubCM - Distance from rotor apex to hub mass [positive downwind] (meters)
-3.492 OverHang - Distance from yaw axis to rotor apex [3 blades] (meters)
-1 NacCMxn - Downwind distance from the tower-top to the nacelle CM (meters)
0.0 NacCMyn - Lateral distance from the tower-top to the nacelle CM (meters)
1.430 NacCMzn - Vertical distance from the tower-top to the nacelle CM (meters)
77.99 TowerHt - Height of tower above ground level [onshore] or MSL [offshore] (meters)
2.01 Twr2Shft - Vertical distance from the tower-top to the rotor shaft (meters)
0.0 TwrRBHt - Tower rigid base height (meters)
-5.0 ShftTilt - Rotor shaft tilt angle (degrees)
0.0 Delta3 - Delta-3 angle for teetering rotors (degrees) [unused for 3 blades]
3.5 PreCone(1) - Blade 1 cone angle (degrees)
3.5 PreCone(2) - Blade 2 cone angle (degrees)
3.5 PreCone(3) - Blade 3 cone angle (degrees) [unused for 2 blades]
0.0 AzimB1Up - Azimuth value to use for I/O when blade 1 points up (degrees)
---------------------- MASS AND INERTIA ----------------------------------------
0.0 YawBrMass - Yaw bearing mass (kg)
87E3 NacMass - Nacelle mass (kg)
20E3 HubMass - Hub mass (kg)
0.0 TipMass(1) - Tip-brake mass, blade 1 (kg)
0.0 TipMass(2) - Tip-brake mass, blade 2 (kg)
0.0 TipMass(3) - Tip-brake mass, blade 3 (kg)
100E3 NacYIner - Nacelle inertia about yaw axis (kg m^2)
89 GenIner - Generator inertia about HSS (kg m^2)
10E3 HubIner - Hub inertia about rotor axis [3 blades](kg m^2)
[/code]

The Aerodyn input file:

1.5 MW baseline aerodynamic parameters for FAST certification test #13. SI SysUnits - System of units for used for input and output [must be SI for FAST] (unquoted string) BEDDOES StallMod - Dynamic stall included [BEDDOES or STEADY] (unquoted string) NO_CM UseCm - Use aerodynamic pitching moment model? [USE_CM or NO_CM] (unquoted string) DYNIN InfModel - Inflow model [DYNIN or EQUIL] (unquoted string) SWIRL IndModel - Induction-factor model [NONE or WAKE or SWIRL] (unquoted string) 0.005 AToler - Induction-factor tolerance (convergence criteria) (-) PRANDtl TLModel - Tip-loss model (EQUIL only) [PRANDtl, GTECH, or NONE] (unquoted string) PRANDtl HLModel - Hub-loss model (EQUIL only) [PRANdtl or NONE] (unquoted string) "Wind/WP_Baseline/Shr12_02.wnd" WindFile - Name of file containing wind data (quoted string) 80 HH - Wind reference (hub) height [TowerHt+Twr2Shft+OverHang*SIN(ShftTilt)] (m) 0.0 TwrShad - Tower-shadow velocity deficit (-) 9999.9 ShadHWid - Tower-shadow half width (m) 9999.9 T_Shad_Refpt - Tower-shadow reference point (m) 1.225 AirDens - Air density (kg/m^3) 1.4639E-5 KinVisc - Kinematic air viscosity (m^2/sec) 0.005 DTAero - Time interval for aerodynamic calculations (sec) 4 NumFoil - Number of airfoil files (-) "AeroData/WP_Baseline/cylinder.dat" FoilNm - Names of the airfoil files [NumFoil lines] (quoted strings) "AeroData/WP_Baseline/s818_2703.dat" "AeroData/WP_Baseline/s825_2103.dat" "AeroData/WP_Baseline/s826_1603.dat" 26 BldNodes - Number of blade nodes used for analysis (-)!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! RNodes AeroTwst DRNodes Chord NFoil PrnElm 2.0140 10.8200 1.6880 2.2520 1 3.7015 13.0300 1.6870 2.5820 1 5.3890 14.8200 1.6880 2.9590 2 7.0765 15.1300 1.6870 3.3360 2 8.7640 14.4200 1.6880 3.5700 2 10.4515 11.7300 1.6870 3.5120 2 12.1390 9.6900 1.6880 3.2960 2 13.8265 8.0800 1.6870 3.0590 3 15.5140 6.7800 1.6880 2.8140 3 17.2015 5.7200 1.6870 2.5800 3 18.8890 4.8500 1.6880 2.3720 3 20.5765 4.1100 1.6870 2.1920 3 22.2640 3.4800 1.6880 2.0350 3 23.9515 2.9300 1.6870 1.8990 3 25.6390 2.4500 1.6880 1.7800 3 27.3265 2.0300 1.6870 1.6750 3 29.0140 1.6000 1.6880 1.5810 3 30.7015 1.2200 1.6870 1.4950 3 32.3890 0.8600 1.6880 1.4130 3 34.0765 0.5400 1.6870 1.3320 3 35.7640 0.2400 1.6880 1.2500 4 37.4515 -0.0400 1.6870 1.1660 4 39.1390 -0.3000 1.6880 1.0810 4 40.8265 -0.5400 1.6870 0.9960 4 42.5140 -0.7400 1.6880 0.9110 4 44.2015 -0.8600 1.6870 0.8260 4 45.7480 5.1400 1.4060 0.0220 4

I disabled all degrees-of-freedoms expect GenDOF and DrTrDOF. Then I run FAST. The following error appears:

Running AeroDyn (v13.00.02a-bjj, 20-Feb-2013). Heading of the AeroDyn input file: 1.5 MW baseline aerodynamic parameters for FAST certification test #13. TipRadius must be equal to HubRadius + SUM( DR(:) ). Could not initialize AeroDyn. Aborting FAST.

[b]I checked the parameters. But found that my parameters absolutely meet the requirement of TipRadius=HubRadius + SUM( DR(:slight_smile: ):

HubRadius + SUM( DR(:slight_smile: )=1.17+sum(1.688 1.687 1.688 1.687 1.688 1.687 1.688 1.687 1.688 1.687 1.688 1.687 1.688 1.687 1.688 1.687 1.688 1.687 1.688 1.687 1.688 1.687 1.688 1.687 1.688 1.687 1.406)=46.451=TipRadius

It is appreciated if someone could give me some advices about how to check where the problem is? Thanks in advance[/b]

Best Regards,
Chao

Hi everyone,

The above problem has been sovled.

The parameter of ‘BldNodes’ in the Aerodyn input file should be 27.

Thanks all the same.

Best Regards to all of you.

Chao