Something wrong about OPENFAST output

Wind & Water
1

Hi Jonkman
I am currently running the IEA 15MW reference wind turbine (RWT) with a semi-submersible floating platform，my OPENFAST terminated normally and also outputted some results, but I found that the value of some parameters related to twist,for example,TwstDefl1,TwstDefl2,TwstDefl3,TTDspTwst have been constantly 0. I have already turn on all the parameters related to degrees of freedom except TeetDOF in ElastoDyn, so I’m curious why the values of the above parameters have always been 0, and which parts of my settings may still have problems? and below is my OPENFAST running process.

OpenFAST

Copyright (C) 2023 National Renewable Energy Laboratory
Copyright (C) 2023 Envision Energy USA LTD

This program is licensed under Apache License Version 2.0 and comes with ABSOLUTELY NO WARRANTY.
See the “LICENSE” file distributed with this software for details.

OpenFAST-Unversioned from 18704086dad861ab13daf804825da7c4b8d59428
Compile Info:

  • Compiler: Intel(R) Fortran Compiler 2021
  • Architecture: 64 bit
  • Precision: single
  • OpenMP: No
  • Date: Feb 18 2023
  • Time: 12:16:53
    Execution Info:
  • Date: 12/01/2023
  • Time: 09:43:12+0800

OpenFAST input file heading:
IEA 15 MW offshore reference model on UMaine VolturnUS-S semi-submersible floating platform

Running ElastoDyn.
Nodal outputs section of ElastoDyn input file not found or improperly formatted.
Running AeroDyn.
AD15 Nodal Outputs: Nodal output section of AeroDyn input file not found or improperly formatted.
Skipping nodal outputs.
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 1, blade 1)
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 2, blade 1)
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 1, blade 2)
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 2, blade 2)
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 1, blade 3)
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 2, blade 3)
Running InflowWind.

Reading a 62x62 grid (260 m wide, 20 m to 280 m above ground) with a characteristic wind speed
of 12 m/s. This full-field file was generated by TurbSim (from OpenFAST-v3.4.1) on 29-Nov-2023
at 10:32:12.

Processed 20534 time steps of 20-Hz full-field data (1026.7 seconds).
Running HydroDyn.
Setting WaveTMax to 0.0 since WaveMod = 0
WARNING: The requested output channel is invalid: WavesF1xi
WARNING: The requested output channel is invalid: WavesF1zi
WARNING: The requested output channel is invalid: WavesM1yi
WARNING: The requested output channel is invalid: WavesF2xi
WARNING: The requested output channel is invalid: WavesF2zi
WARNING: The requested output channel is invalid: WavesM2yi
WARNING: The requested output channel is invalid: WavesF2xi
WARNING: The requested output channel is invalid: WavesF2yi
WARNING: The requested output channel is invalid: WavesF2zi
WARNING: The requested output channel is invalid: WavesM2xi
WARNING: The requested output channel is invalid: WavesM2yi
WARNING: The requested output channel is invalid: WavesM2zi
Calculating second order difference frequency wave kinematics.
Reading in WAMIT output with root name “.\HydroData/IEA-15-240-RWT-UMaineSemi”.
Computing radiation impulse response functions and wave diffraction forces.
Calculating second order difference-frequency force using the full quadratic transfer function.
Running MoorDyn (v2.0.0, 2022-12-08).
This is MoorDyn v2, with significant input file changes from v1.
Copyright: (C) 2022 National Renewable Energy Laboratory, (C) 2019 Matt Hall
Parsing MoorDyn input file: .\IEA-15-240-RWT-UMaineSemi_MoorDyn.dat
Warning: invalid output specifier FX. Must start with L, C, R, or B
Warning: invalid output specifier FY. Must start with L, C, R, or B
Warning: invalid output specifier FZ. Must start with L, C, R, or B
Created mooring system: 3 lines, 6 points, 0 rods, 0 bodies.
Finalizing initial conditions using dynamic relaxation.
t=60 FairTen 1: 2.42597E+06, 2.45002E+06, 2.43250E+06
Fairlead tensions did not converge within TMaxIC=60 seconds.
MoorDyn initialization completed.
Running ServoDyn.
Running ServoDyn Interface for Bladed Controllers (using Intel Visual Fortran for Windows).
Using legacy Bladed DLL interface.

FAST_InitializeAll:HydroDyn_Init:HydroDynInput_ProcessInitData: A requested output channel is
invalid

Running ROSCO-v2.8.0
A wind turbine controller framework for public use in the scientific field
Developed in collaboration: National Renewable Energy Laboratory
Delft University of Technology, The Netherlands

Generator speed: 7.6 RPM, Pitch angle: -1.0 deg, Power: 0.0 kW, Est. wind Speed: 12.5 m/s

FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption2:AD_CalcOutput:RotCalcOutput:BEMT_CalcOut
put(node 3, blade 1):UA_CalcOutput:UA_BlendSteady:Temporarily turning off UA due to high angle of
attack or low relative velocity. This warning will not be repeated though the condition may
persist.

FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption2:AD_CalcOutput:RotCalcOutput:BEMT_CalcOut
put(node 50, blade 2):UA_CalcOutput:Mach number exceeds 0.3. Theory is invalid. This warning will
not be repeated though the condition may persist.
Generator speed: 6.5 RPM, Pitch angle: 6.7 deg, Power: 11715.8 kW, Est. wind Speed: 9.9 m/s
Generator speed: 7.5 RPM, Pitch angle: 4.4 deg, Power: 14676.6 kW, Est. wind Speed: 12.5 m/s
Generator speed: 7.6 RPM, Pitch angle: 6.3 deg, Power: 14738.2 kW, Est. wind Speed: 11.2 m/s
Generator speed: 7.7 RPM, Pitch angle: 6.7 deg, Power: 15465.9 kW, Est. wind Speed: 12.6 m/s
Generator speed: 8.0 RPM, Pitch angle: 8.2 deg, Power: 15849.4 kW, Est. wind Speed: 13.3 m/s
Generator speed: 7.7 RPM, Pitch angle: 9.3 deg, Power: 14964.0 kW, Est. wind Speed: 13.0 m/s
Generator speed: 7.4 RPM, Pitch angle: 9.3 deg, Power: 14856.7 kW, Est. wind Speed: 13.5 m/s
Generator speed: 7.8 RPM, Pitch angle: 10.4 deg, Power: 15452.6 kW, Est. wind Speed: 14.5 m/s
Generator speed: 7.6 RPM, Pitch angle: 10.0 deg, Power: 14927.4 kW, Est. wind Speed: 13.7 m/s
Generator speed: 7.0 RPM, Pitch angle: 7.9 deg, Power: 13913.3 kW, Est. wind Speed: 12.4 m/s
Generator speed: 7.3 RPM, Pitch angle: 6.6 deg, Power: 14348.8 kW, Est. wind Speed: 12.0 m/s
Generator speed: 7.4 RPM, Pitch angle: 4.1 deg, Power: 13714.1 kW, Est. wind Speed: 11.2 m/s
Generator speed: 7.5 RPM, Pitch angle: 4.2 deg, Power: 14330.2 kW, Est. wind Speed: 11.0 m/s
Generator speed: 7.8 RPM, Pitch angle: 5.1 deg, Power: 15508.0 kW, Est. wind Speed: 11.8 m/s
Generator speed: 7.9 RPM, Pitch angle: 6.6 deg, Power: 15720.6 kW, Est. wind Speed: 12.5 m/s
Generator speed: 7.8 RPM, Pitch angle: 8.0 deg, Power: 15318.9 kW, Est. wind Speed: 12.7 m/s
Generator speed: 7.4 RPM, Pitch angle: 7.5 deg, Power: 14683.6 kW, Est. wind Speed: 12.3 m/s
Generator speed: 7.5 RPM, Pitch angle: 7.3 deg, Power: 14812.5 kW, Est. wind Speed: 12.5 m/s
Generator speed: 7.8 RPM, Pitch angle: 8.4 deg, Power: 15528.0 kW, Est. wind Speed: 13.4 m/s
Generator speed: 7.9 RPM, Pitch angle: 10.0 deg, Power: 15733.2 kW, Est. wind Speed: 14.2 m/s
Generator speed: 7.6 RPM, Pitch angle: 10.0 deg, Power: 14936.8 kW, Est. wind Speed: 13.7 m/s
Generator speed: 7.3 RPM, Pitch angle: 9.3 deg, Power: 14462.6 kW, Est. wind Speed: 13.3 m/s
Generator speed: 7.2 RPM, Pitch angle: 7.4 deg, Power: 14439.2 kW, Est. wind Speed: 12.6 m/s
Generator speed: 7.3 RPM, Pitch angle: 6.4 deg, Power: 14519.9 kW, Est. wind Speed: 11.9 m/s
Generator speed: 7.4 RPM, Pitch angle: 5.3 deg, Power: 14747.3 kW, Est. wind Speed: 11.6 m/s
Generator speed: 7.6 RPM, Pitch angle: 5.5 deg, Power: 15038.2 kW, Est. wind Speed: 11.8 m/s
Generator speed: 7.7 RPM, Pitch angle: 6.5 deg, Power: 15251.2 kW, Est. wind Speed: 12.1 m/s
Generator speed: 7.5 RPM, Pitch angle: 5.7 deg, Power: 14866.3 kW, Est. wind Speed: 11.7 m/s
Generator speed: 7.5 RPM, Pitch angle: 6.1 deg, Power: 14822.1 kW, Est. wind Speed: 11.9 m/s
Generator speed: 7.5 RPM, Pitch angle: 5.2 deg, Power: 14980.6 kW, Est. wind Speed: 11.7 m/s

Total Real Time: 18.529 hours
Total CPU Time: 6.6003 hours
Simulation CPU Time: 6.5977 hours
Simulated Time: 8.33333E-02 hours
Time Ratio (Sim/CPU): 1.26307E-02

OpenFAST terminated normally.

2

Dear @Xiang.Wang,

It looks like you are modeling the structural dynamics of the blades and tower in ElastoDyn, which does not have blade and tower torsion degrees of freedom. So, these twist-related outputs of ElastoDyn will always be zero.

Best regards,

3

Hi, Jonkman
Thank you for your reply. I understand the previous question. But due to my lack of proficiency in using OPENFAST, the new issue I am currently facing is that OPENFAST can still run normally, but there are many parameters that do not have valid outputs, parameters related to Root such as RootFxc1, RootMxc1 and some other parameters related to blade root load are all zero, so I am curious about which parts of the incorrect settings caused the above situation. below is my OPENFAST running process.

OpenFAST

Copyright (C) 2023 National Renewable Energy Laboratory
Copyright (C) 2023 Envision Energy USA LTD

This program is licensed under Apache License Version 2.0 and comes with ABSOLUTELY NO WARRANTY.
See the “LICENSE” file distributed with this software for details.

OpenFAST-Unversioned from 18704086dad861ab13daf804825da7c4b8d59428
Compile Info:

  • Compiler: Intel(R) Fortran Compiler 2021
  • Architecture: 64 bit
  • Precision: single
  • OpenMP: No
  • Date: Feb 18 2023
  • Time: 12:16:53
    Execution Info:
  • Date: 12/05/2023
  • Time: 16:52:59+0800

OpenFAST input file heading:
IEA 15 MW offshore reference model on UMaine VolturnUS-S semi-submersible floating platform

Running ElastoDyn.
Nodal outputs section of ElastoDyn input file not found or improperly formatted.
Running BeamDyn.
Nodal outputs section of BeamDyn input file not found or improperly formatted.
Running BeamDyn.
Nodal outputs section of BeamDyn input file not found or improperly formatted.
Running BeamDyn.
Nodal outputs section of BeamDyn input file not found or improperly formatted.
Running AeroDyn.
AD15 Nodal Outputs: Nodal output section of AeroDyn input file not found or improperly formatted.
Skipping nodal outputs.
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 1, blade 1)
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 2, blade 1)
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 1, blade 2)
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 2, blade 2)
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 1, blade 3)
Warning: Turning off Unsteady Aerodynamics because polar has constant data. (node 2, blade 3)
Running InflowWind.

Reading a 46x46 grid (260 m wide, 20 m to 280 m above ground) with a characteristic wind speed
of 10.59 m/s. This full-field file was generated by TurbSim (from OpenFAST-v3.4.1) on
05-Dec-2023 at 16:21:11.

Processed 20592 time steps of 20-Hz full-field data (1029.6 seconds).
Running HydroDyn.
WaveTMax is less then the simulation time. Wave data will repeat every WaveTMax seconds.
Generating incident wave kinematics and current time history.
Reading in WAMIT output with root name “.\HydroData/IEA-15-240-RWT-UMaineSemi”.
Computing radiation impulse response functions and wave diffraction forces.
Calculating second order difference-frequency force using the full quadratic transfer function.
Running MoorDyn (v2.0.0, 2022-12-08).
This is MoorDyn v2, with significant input file changes from v1.
Copyright: (C) 2022 National Renewable Energy Laboratory, (C) 2019 Matt Hall
Parsing MoorDyn input file: .\IEA-15-240-RWT-UMaineSemi_MoorDyn.dat
Created mooring system: 3 lines, 6 points, 0 rods, 0 bodies.
Finalizing initial conditions using dynamic relaxation.
t=60 FairTen 1: 2.42597E+06, 2.45002E+06, 2.43250E+06
Fairlead tensions did not converge within TMaxIC=60 seconds.
MoorDyn initialization completed.
Running ServoDyn.
Running ServoDyn Interface for Bladed Controllers (using Intel Visual Fortran for Windows).
Using legacy Bladed DLL interface.

Running ROSCO-v2.8.0
A wind turbine controller framework for public use in the scientific field
Developed in collaboration: National Renewable Energy Laboratory
Delft University of Technology, The Netherlands

Generator speed: 7.6 RPM, Pitch angle: -1.0 deg, Power: 0.0 kW, Est. wind Speed: 12.7 m/s

FAST_Solution:FAST_AdvanceStates:SrvD_UpdateStates:DLL_controller_call:BladedInterface option was
designed for an explicit-loose coupling scheme. Using last calculated values from DLL on all
subsequent calls until time is advanced. Warning will not be displayed again.

FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption2:AD_CalcOutput:RotCalcOutput:BEMT_CalcOut
put(node 3, blade 1):UA_CalcOutput:UA_BlendSteady:Temporarily turning off UA due to high angle of
attack or low relative velocity. This warning will not be repeated though the condition may
persist.
Generator speed: 6.1 RPM, Pitch angle: 2.9 deg, Power: 9903.3 kW, Est. wind Speed: 8.4 m/s
Generator speed: 6.2 RPM, Pitch angle: 1.2 deg, Power: 9582.8 kW, Est. wind Speed: 10.1 m/s
Generator speed: 7.1 RPM, Pitch angle: 1.2 deg, Power: 11146.0 kW, Est. wind Speed: 9.7 m/s
Generator speed: 7.2 RPM, Pitch angle: 1.5 deg, Power: 12501.4 kW, Est. wind Speed: 10.1 m/s
Generator speed: 7.6 RPM, Pitch angle: 2.4 deg, Power: 13536.8 kW, Est. wind Speed: 10.6 m/s
Time: 50 of 1000 seconds. Estimated final completion at 02:51:59.

FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption2:AD_CalcOutput:RotCalcOutput:BEMT_CalcOut
put(node 50, blade 2):UA_CalcOutput:Mach number exceeds 0.3. Theory is invalid. This warning will
not be repeated though the condition may persist.
Generator speed: 7.7 RPM, Pitch angle: 4.7 deg, Power: 15314.1 kW, Est. wind Speed: 11.3 m/s
Generator speed: 7.7 RPM, Pitch angle: 5.8 deg, Power: 15321.4 kW, Est. wind Speed: 11.9 m/s
Generator speed: 7.6 RPM, Pitch angle: 5.8 deg, Power: 14969.1 kW, Est. wind Speed: 11.7 m/s
Generator speed: 7.2 RPM, Pitch angle: 4.1 deg, Power: 13603.6 kW, Est. wind Speed: 10.9 m/s
Generator speed: 7.2 RPM, Pitch angle: 3.5 deg, Power: 12646.9 kW, Est. wind Speed: 10.6 m/s
Generator speed: 7.4 RPM, Pitch angle: 2.8 deg, Power: 12500.8 kW, Est. wind Speed: 10.2 m/s
Generator speed: 6.8 RPM, Pitch angle: 0.5 deg, Power: 11281.5 kW, Est. wind Speed: 9.5 m/s
Generator speed: 6.6 RPM, Pitch angle: 0.6 deg, Power: 10779.6 kW, Est. wind Speed: 9.4 m/s
Generator speed: 7.0 RPM, Pitch angle: 0.8 deg, Power: 11516.9 kW, Est. wind Speed: 10.1 m/s
Generator speed: 7.3 RPM, Pitch angle: 1.4 deg, Power: 12356.7 kW, Est. wind Speed: 10.1 m/s
Generator speed: 7.6 RPM, Pitch angle: 2.4 deg, Power: 13631.8 kW, Est. wind Speed: 10.7 m/s
Generator speed: 7.6 RPM, Pitch angle: 3.0 deg, Power: 14065.2 kW, Est. wind Speed: 10.6 m/s
Generator speed: 7.4 RPM, Pitch angle: 2.5 deg, Power: 13154.0 kW, Est. wind Speed: 10.2 m/s
Generator speed: 7.5 RPM, Pitch angle: 3.1 deg, Power: 14222.5 kW, Est. wind Speed: 10.9 m/s
Generator speed: 7.8 RPM, Pitch angle: 6.0 deg, Power: 15686.9 kW, Est. wind Speed: 12.1 m/s
Generator speed: 7.7 RPM, Pitch angle: 6.2 deg, Power: 15245.6 kW, Est. wind Speed: 11.8 m/s
Generator speed: 7.5 RPM, Pitch angle: 6.3 deg, Power: 14893.4 kW, Est. wind Speed: 12.0 m/s
Generator speed: 7.4 RPM, Pitch angle: 4.8 deg, Power: 14560.0 kW, Est. wind Speed: 11.5 m/s
Generator speed: 7.1 RPM, Pitch angle: 3.2 deg, Power: 11974.4 kW, Est. wind Speed: 10.1 m/s
Generator speed: 6.9 RPM, Pitch angle: 1.5 deg, Power: 11473.9 kW, Est. wind Speed: 9.7 m/s
Generator speed: 6.8 RPM, Pitch angle: 1.0 deg, Power: 11129.8 kW, Est. wind Speed: 9.6 m/s
Generator speed: 6.9 RPM, Pitch angle: 0.5 deg, Power: 11010.3 kW, Est. wind Speed: 9.5 m/s
Generator speed: 6.5 RPM, Pitch angle: 0.0 deg, Power: 10161.6 kW, Est. wind Speed: 9.3 m/s
Generator speed: 7.0 RPM, Pitch angle: 0.6 deg, Power: 11087.9 kW, Est. wind Speed: 9.8 m/s
Generator speed: 6.9 RPM, Pitch angle: 0.6 deg, Power: 11086.6 kW, Est. wind Speed: 9.5 m/s
Generator speed: 6.8 RPM, Pitch angle: 0.2 deg, Power: 10617.8 kW, Est. wind Speed: 9.4 m/s
Generator speed: 6.7 RPM, Pitch angle: 0.5 deg, Power: 10737.0 kW, Est. wind Speed: 9.5 m/s
Generator speed: 6.7 RPM, Pitch angle: 0.2 deg, Power: 10424.1 kW, Est. wind Speed: 9.4 m/s
Generator speed: 6.2 RPM, Pitch angle: 0.0 deg, Power: 8772.4 kW, Est. wind Speed: 8.6 m/s
Generator speed: 5.6 RPM, Pitch angle: 0.0 deg, Power: 7047.3 kW, Est. wind Speed: 8.2 m/s
Generator speed: 5.8 RPM, Pitch angle: 0.4 deg, Power: 7116.2 kW, Est. wind Speed: 8.5 m/s
Generator speed: 6.2 RPM, Pitch angle: 0.3 deg, Power: 7986.5 kW, Est. wind Speed: 8.7 m/s
Generator speed: 6.5 RPM, Pitch angle: 0.2 deg, Power: 8927.6 kW, Est. wind Speed: 8.9 m/s
Generator speed: 6.2 RPM, Pitch angle: 0.0 deg, Power: 8292.8 kW, Est. wind Speed: 8.7 m/s
Generator speed: 6.1 RPM, Pitch angle: 0.0 deg, Power: 7821.9 kW, Est. wind Speed: 8.5 m/s
Generator speed: 6.1 RPM, Pitch angle: 0.4 deg, Power: 8091.1 kW, Est. wind Speed: 8.7 m/s
Generator speed: 6.7 RPM, Pitch angle: 0.2 deg, Power: 9566.5 kW, Est. wind Speed: 9.5 m/s
Generator speed: 6.9 RPM, Pitch angle: 0.3 deg, Power: 10723.4 kW, Est. wind Speed: 9.5 m/s
Generator speed: 7.2 RPM, Pitch angle: 0.6 deg, Power: 11657.0 kW, Est. wind Speed: 10.0 m/s
Generator speed: 7.1 RPM, Pitch angle: 0.8 deg, Power: 11894.9 kW, Est. wind Speed: 9.8 m/s
Generator speed: 7.1 RPM, Pitch angle: 0.8 deg, Power: 11980.9 kW, Est. wind Speed: 9.9 m/s
Generator speed: 7.5 RPM, Pitch angle: 2.8 deg, Power: 13630.5 kW, Est. wind Speed: 10.6 m/s
Generator speed: 7.7 RPM, Pitch angle: 4.5 deg, Power: 15021.7 kW, Est. wind Speed: 11.1 m/s
Generator speed: 7.2 RPM, Pitch angle: 2.6 deg, Power: 12149.0 kW, Est. wind Speed: 9.8 m/s
Generator speed: 6.7 RPM, Pitch angle: 1.1 deg, Power: 11768.7 kW, Est. wind Speed: 9.8 m/s
Generator speed: 7.5 RPM, Pitch angle: 3.4 deg, Power: 13970.4 kW, Est. wind Speed: 11.2 m/s
Generator speed: 7.7 RPM, Pitch angle: 4.7 deg, Power: 15359.0 kW, Est. wind Speed: 11.5 m/s
Generator speed: 7.4 RPM, Pitch angle: 4.5 deg, Power: 14573.3 kW, Est. wind Speed: 10.8 m/s
Generator speed: 7.5 RPM, Pitch angle: 5.4 deg, Power: 14821.7 kW, Est. wind Speed: 11.4 m/s
Generator speed: 7.6 RPM, Pitch angle: 4.0 deg, Power: 15202.3 kW, Est. wind Speed: 11.4 m/s
Generator speed: 7.2 RPM, Pitch angle: 3.1 deg, Power: 12695.2 kW, Est. wind Speed: 10.3 m/s
Generator speed: 7.1 RPM, Pitch angle: 2.3 deg, Power: 12310.9 kW, Est. wind Speed: 10.1 m/s
Generator speed: 7.2 RPM, Pitch angle: 2.1 deg, Power: 12406.8 kW, Est. wind Speed: 10.1 m/s
Generator speed: 7.4 RPM, Pitch angle: 2.0 deg, Power: 13029.2 kW, Est. wind Speed: 10.4 m/s
Generator speed: 7.5 RPM, Pitch angle: 2.5 deg, Power: 13678.6 kW, Est. wind Speed: 10.7 m/s
Generator speed: 7.7 RPM, Pitch angle: 4.7 deg, Power: 15036.3 kW, Est. wind Speed: 11.2 m/s
Generator speed: 7.4 RPM, Pitch angle: 3.3 deg, Power: 13911.7 kW, Est. wind Speed: 10.6 m/s
Generator speed: 7.5 RPM, Pitch angle: 3.5 deg, Power: 14291.4 kW, Est. wind Speed: 10.9 m/s
Generator speed: 7.5 RPM, Pitch angle: 3.4 deg, Power: 14492.1 kW, Est. wind Speed: 11.0 m/s
Generator speed: 7.3 RPM, Pitch angle: 3.0 deg, Power: 12782.4 kW, Est. wind Speed: 10.2 m/s
Generator speed: 7.2 RPM, Pitch angle: 2.2 deg, Power: 12700.4 kW, Est. wind Speed: 10.2 m/s
Generator speed: 7.7 RPM, Pitch angle: 4.8 deg, Power: 15624.6 kW, Est. wind Speed: 11.5 m/s
Generator speed: 7.9 RPM, Pitch angle: 6.5 deg, Power: 15590.4 kW, Est. wind Speed: 12.2 m/s
Generator speed: 7.0 RPM, Pitch angle: 3.4 deg, Power: 11572.5 kW, Est. wind Speed: 9.9 m/s
Generator speed: 6.6 RPM, Pitch angle: 1.7 deg, Power: 11312.6 kW, Est. wind Speed: 9.7 m/s
Generator speed: 7.2 RPM, Pitch angle: 2.4 deg, Power: 12279.9 kW, Est. wind Speed: 10.6 m/s
Generator speed: 7.5 RPM, Pitch angle: 2.3 deg, Power: 12876.5 kW, Est. wind Speed: 10.1 m/s
Generator speed: 7.2 RPM, Pitch angle: 1.3 deg, Power: 12409.5 kW, Est. wind Speed: 10.0 m/s
Generator speed: 7.1 RPM, Pitch angle: 1.6 deg, Power: 12345.6 kW, Est. wind Speed: 10.1 m/s
Generator speed: 7.4 RPM, Pitch angle: 2.2 deg, Power: 12985.2 kW, Est. wind Speed: 10.5 m/s
Generator speed: 7.5 RPM, Pitch angle: 2.6 deg, Power: 13140.3 kW, Est. wind Speed: 10.2 m/s
Generator speed: 7.1 RPM, Pitch angle: 1.3 deg, Power: 12250.2 kW, Est. wind Speed: 9.9 m/s
Generator speed: 7.0 RPM, Pitch angle: 1.5 deg, Power: 12151.1 kW, Est. wind Speed: 10.0 m/s
Generator speed: 7.3 RPM, Pitch angle: 2.1 deg, Power: 12712.9 kW, Est. wind Speed: 10.5 m/s
Generator speed: 7.7 RPM, Pitch angle: 3.1 deg, Power: 13961.3 kW, Est. wind Speed: 10.6 m/s
Generator speed: 7.3 RPM, Pitch angle: 2.3 deg, Power: 12816.8 kW, Est. wind Speed: 10.1 m/s
Generator speed: 6.9 RPM, Pitch angle: 0.9 deg, Power: 11689.5 kW, Est. wind Speed: 9.7 m/s
Generator speed: 7.0 RPM, Pitch angle: 1.8 deg, Power: 12118.9 kW, Est. wind Speed: 10.0 m/s
Generator speed: 7.1 RPM, Pitch angle: 1.7 deg, Power: 11600.3 kW, Est. wind Speed: 9.8 m/s
Generator speed: 6.6 RPM, Pitch angle: 0.2 deg, Power: 10295.1 kW, Est. wind Speed: 9.1 m/s
Generator speed: 6.3 RPM, Pitch angle: 0.6 deg, Power: 9523.0 kW, Est. wind Speed: 8.9 m/s
Generator speed: 6.7 RPM, Pitch angle: 0.0 deg, Power: 10090.0 kW, Est. wind Speed: 9.6 m/s
Generator speed: 7.1 RPM, Pitch angle: 0.9 deg, Power: 11520.8 kW, Est. wind Speed: 9.7 m/s
Generator speed: 7.0 RPM, Pitch angle: 0.7 deg, Power: 11708.6 kW, Est. wind Speed: 9.9 m/s
Generator speed: 7.0 RPM, Pitch angle: 0.8 deg, Power: 11342.5 kW, Est. wind Speed: 9.5 m/s
Generator speed: 6.5 RPM, Pitch angle: 0.0 deg, Power: 10109.3 kW, Est. wind Speed: 9.3 m/s
Generator speed: 6.2 RPM, Pitch angle: 0.0 deg, Power: 8736.6 kW, Est. wind Speed: 8.6 m/s
Generator speed: 5.6 RPM, Pitch angle: 0.0 deg, Power: 6887.8 kW, Est. wind Speed: 8.0 m/s
Generator speed: 5.0 RPM, Pitch angle: 0.0 deg, Power: 5063.7 kW, Est. wind Speed: 7.2 m/s
Generator speed: 4.8 RPM, Pitch angle: 0.0 deg, Power: 4207.8 kW, Est. wind Speed: 7.0 m/s
Generator speed: 4.8 RPM, Pitch angle: 0.2 deg, Power: 3890.1 kW, Est. wind Speed: 7.0 m/s
Generator speed: 4.9 RPM, Pitch angle: 0.3 deg, Power: 3859.8 kW, Est. wind Speed: 6.8 m/s
Generator speed: 5.1 RPM, Pitch angle: 0.4 deg, Power: 4548.8 kW, Est. wind Speed: 7.4 m/s
Generator speed: 5.6 RPM, Pitch angle: 0.5 deg, Power: 5518.6 kW, Est. wind Speed: 7.6 m/s
Generator speed: 5.5 RPM, Pitch angle: 0.0 deg, Power: 5465.2 kW, Est. wind Speed: 7.7 m/s

Total Real Time: 12.07 hours
Total CPU Time: 4.1971 hours
Simulation CPU Time: 4.1969 hours
Simulated Time: 0.27778 hours
Time Ratio (Sim/CPU): 6.61871E-02

OpenFAST terminated normally.

4

Dear @Xiang.Wang,

It looks like your OpenFAST simulation is completing normally.

The ElastoDyn blade-root outputs are zeroed in your case because you are running a simulation with the blade structural dynamics modeled in BeamDyn rather than in ElastoDyn. In this case, you can find the proper blade reaction loads in the BeamDyn output instead.

Best regards,

5

Dear @Jason.Jonkman
Thank you for your answer，I found a lot of meaningful output data in BeamDyn. But at the same time, I also discovered a problem，I am currently exploring the BeanDyn nodal output module. I noticed that you and another colleague have already discussed this issue on July. He mentioned that when sets “kp_total”=“station_total”=50, a maximum of 50 results can be output. But when I set “kp_total”=50, only 41 node outputs were obtained. After setting “kp_total”=“station_total”=50, OPENFAST reported an error. What do you think may be the reasons for the above problem? below is my OPENFAST running process.

OpenFAST

Copyright (C) 2023 National Renewable Energy Laboratory
Copyright (C) 2023 Envision Energy USA LTD

This program is licensed under Apache License Version 2.0 and comes with ABSOLUTELY NO WARRANTY.
See the “LICENSE” file distributed with this software for details.

OpenFAST-Unversioned from 18704086dad861ab13daf804825da7c4b8d59428
Compile Info:

  • Compiler: Intel(R) Fortran Compiler 2021
  • Architecture: 64 bit
  • Precision: single
  • OpenMP: No
  • Date: Feb 18 2023
  • Time: 12:16:53
    Execution Info:
  • Date: 12/07/2023
  • Time: 18:27:02+0800

OpenFAST input file heading:
IEA 15 MW offshore reference model on UMaine VolturnUS-S semi-submersible floating platform

Running ElastoDyn.
Nodal outputs section of ElastoDyn input file not found or improperly formatted.
Running BeamDyn.

FAST_InitializeAll:BD_Init:BD_ReadInput:BD_ReadBladeFile:Premature EOF for file
“.\IEA-15-240-RWT_BeamDyn_Blade.dat” occurred while trying to read station_eta.
BD_ReadBladeFile:Premature EOF for file “.\IEA-15-240-RWT_BeamDyn_Blade.dat” occurred while
trying to read siffness_matrix.
BD_ReadBladeFile:Premature EOF for file “.\IEA-15-240-RWT_BeamDyn_Blade.dat” occurred while
trying to read siffness_matrix.
BD_ReadBladeFile:Premature EOF for file “.\IEA-15-240-RWT_BeamDyn_Blade.dat” occurred while
trying to read siffness_matrix.
BD_ReadBladeFile:Premature EOF for file “.\IEA-15-240-RWT_BeamDyn_Blade.dat” occurred while
trying to read siffness_matrix.
BD_ReadBladeFile:Premature EOF for file “.\IEA-15-240-RWT_BeamDyn_Blade.dat” occurred while
trying to read siffness_matrix.
BD_ReadBladeFile:Premature EOF for file “.\IEA-15-240-RWT_BeamDyn_Blade.dat” occurred while
trying to read siffness_matrix.

OpenFAST encountered an error during module initialization.
Simulation error level: FATAL ERROR

Aborting OpenFAST.

6

Dear @Xiang.Wang,

I’m not sure I fully understand your question, but the key points and stations are independent things in BeamDyn. The key points define the reference curve/axis of the beam. The stations define the beam properties relative to the reference curve/axis. kp_total and station_total can be set independently, but you must have kp_total number of lines in the key point definition in the BeamDyn primary input file and station_total number of sectional properties in the BeamDyn blade input file. When using trapezoidal quadrature, the number of nodal outputs is tied to station_total. The error you are receiving implies that you changed station_total without changing the number of sectional properties.

Best regards,

7

Dear @Jason.Jonkman
Thank you for your reply，I think I understand the meaning of “kp_total” and “station_total”. But now another question arises, you mentioned that when using trapezoidal quadrature, the number of nodal outputs is tied to “station_total”, I followed the initial values and set “kp_total” =50,“station_total”=21, then OPENFAST can terminate nomarly, but I can get 41 nodal outputs, for example, the parameter Fxr for blade 1, I can get outputs from B1N001_Fxr to B1N041_Fxr. Is the problem mentioned above a normal phenomenon? How can I know the position of these 41 calculation points in the blade？

Best regards,

8

Dear @Xiang.Wang,

I said that the “when using trapezoidal quadrature, the number of nodal outputs is tied to station_total”; I didn’t say that the number of nodal outputs equals station_total. You can increase the resolution of the analysis/output nodes by setting BeamDyn input parameter refine greater than unity. I’m assuming you are setting refine=2, which will subdivide the gap between each station by 2, adding station_total-1 number of nodes, so, the total number of nodes in this case would be 2*station_total-1.

Best regards,

9

Dear @Jason.Jonkman
Thank you for your patient guidance. I understand this problem now.

Best regards,