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When I simulate with 25m/s turbulent wind, the following error occurs, can you give me some suggestions?
OpenFAST input file heading: Running ElastoDyn. Reading a 39x34 grid (190 m wide, 7.5 m to 172.5 m above ground) with a characteristic wind Processed 12420 time steps of 20-Hz full-field data (period of 621 seconds). FAST_Solution0:CalcOutputs_And_SolveForInputs:SolveOption2:SrvD_CalcOutput:DLL_controller_call:Run FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption2:RotCalcOutput:BEMT_CalcOutput(node 5, FAST_Solution:FAST_AdvanceStates:ED_ABM4:ED_CalcContStateDeriv:SetCoordSy:Small angle assumption FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption2:RotCalcOutput:BEMT_CalcOutput(node 19, FAST_Solution:FAST_AdvanceStates:AD_UpdateStates:SetInputs:TwrInfl:getLocalTowerProps:Tower OpenFAST encountered an error at simulation time 0.7625 of 60 seconds. Aborting OpenFAST. |
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Replies: 4 comments 30 replies
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Dear @tatesnow, Your OpenFAST model appears to be numerically unstable. It looks like you are running the NREL 5-MW land-based wind turbine example. Can you clarify what you changed in this model relative to the model available from the r-test: https://github.com/OpenFAST/r-test/tree/main/glue-codes/openfast/5MW_Land_DLL_WTurb? Best regards, |
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Dear @jjonkman, |
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Dear @jjonkman ,
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Dear @tatesnow, Regarding the "C_nalpha is 0" warnings, you can ignore these, as discussed in a previous OpenFAST issue: #268. Best regards, |
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Dear @jjonkman |
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Dear @lin990316, It looks like you asked a similar question in the following OpenFAST issue: #2047; I've responded there. Best regards, |
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I have a similar question with you .When I simulate with 12m/s turbulent wind, the following error occurs, can you give me some suggestions? FAST (v8.16.00a-bjj, 27-Jul-2016) Running FAST (v8.16.00a-bjj, 27-Jul-2016), compiled as a DLL S-Function for Simulink as a 64-bit FAST_InitializeAll:SrvD_Init:ValidatePrimaryData:Yaw angle and rate are not commanded from Simulink model. |
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Especially for this :---Caused by: |
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Dear @jjonkman, Thanks for your kind help and timely responses all the time! I will learn from the link you gave. Best regards, |
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Dear @jjonkman, Sorry to bother you so frequently. I really use AeroDyn v15. Through learning, I find that if I want to simulate blade structural damage（Blade fault ）, I should change the factors “AdjBlMs, AdjFlSt，AdjEdSt and BMassDen ，FlpStff，EdgStff ”. Am I right？If I understand correctly, how should I revise these parameters? What is their relationship? How to avoid that this error "Error occurred while trying to read BldFl1Sh (i)(which is in 'BLADE MODE SHAPES')" does not occur? In other words, where can I learn about the relationship between these parameters in the "Blade. dat" file? By the way， I use FASTv8. |
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Dear @Crystal0912, Again, I can't provide more guidance on your input file processing error without more clarification from you, but you should be able to use the I would not expect structural damage to effect the blade mass. It could effect the blade stiffness, but I'm not an expert on what such relationships would be. Perhaps someone else can comment. Best regards, |
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Dear @jjonkman, Thank you for your help. I ran successfully by modifying the parameter "FlpStff and EdgStff". It is really irrelevant to the "BMassDen" parameter, as you said. Best regards, |
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Hi @Crystal0912 and @jjonkman |
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Dear @jjonkman I have a similar question. I simulate an 18.9m/s turbulent wind, the following error occurs, can you give me some suggestions? FAST (v8.16.00a-bjj, 27-Jul-2016) Copyright (C) 2016 National Renewable Energy Laboratory This program comes with ABSOLUTELY NO WARRANTY. See the "license.txt" file distributed with this Running FAST (v8.16.00a-bjj, 27-Jul-2016), compiled as a 64-bit application using single Heading of the FAST input file: Running ElastoDyn (v1.04.00a-bjj, 26-Jul-2016). Running AeroDyn (v15.03.00, 27-Jul-2016). Running AirfoilInfo (v1.01.00a-bjj, 5-Apr-2016). Running BEM (v1.02.00, 29-Jun-2016). Running InflowWind (v3.03.00, 26-Jul-2016). Reading a 20x20 grid (140 m wide, 20 m to 160 m above ground) with a characteristic wind speed Processed 12149 time steps of 20-Hz full-field data (607.4 seconds). Running ServoDyn (v1.06.00a-bjj, 26-Jul-2016). Running ServoDyn Interface for Bladed Controllers (using Intel Visual Fortran for Windows, Running HydroDyn (v2.05.01, 27-Jul-2016). Running SubDyn (v1.03.00, 11-Apr-2016). FAST_Solution0:CalcOutputs_And_SolveForInputs:SolveOption2:SrvD_CalcOutput:Running with torque FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption2:SrvD_CalcOutput:BladedInterface option FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption1:ED_SD_HD_BD_Orca_InputOutputSolve:SD_Cal FAST encountered an error at simulation time 0.2 of 600 seconds. Aborting FAST. And below are my inputs: *For TURBISM, I set the wind speed at 18.91m/s Can you help me with the solution for the above problem? Best regard, |
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I obtained it from "\fast\CertTest\5MW_Baseline\ServoData\DISCON_x64.dll" provided |
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That should be fine. Does the original model without the wind speed, rotor speed, and blade-pitch angles changes run as expected? |
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Since the wind speed should be greater than 0, I used 1 m/s wind speed on TURBISM and set the rotor speed and blade pitch angle to 0. However, I received this error instead: FAST_Solution:FAST_AdvanceStates:AD_UpdateStates:BEMT_UpdateStates(node 7, blade |
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The NREL 5-MW baseline wind turbine is not mean to operate at 1 m/s. The original model of the NREL 5-MW turbine atop the OC4-jacket provided in the OpenFAST r-test used turbulent wind at 12 m/s. Does this model run for you as expected? |
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Ah it works well, I have tried to reanalizing my simulation's input and it turned out that the program had an issue with the time step integration that I used. The simulation that I tried have ran as expected by using 0.001 time step. Thank you so much @jjonkman for the solution that you suggested so that the previous problem have been solved. Best regard, |
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Dear @tatesnow,
Your OpenFAST model appears to be numerically unstable. It looks like you are running the NREL 5-MW land-based wind turbine example. Can you clarify what you changed in this model relative to the model available from the r-test: https://github.com/OpenFAST/r-test/tree/main/glue-codes/openfast/5MW_Land_DLL_WTurb?
Best regards,