FAST.Farm Simulation Fails for Specific Seed Pairs at Negative Wind Directions

Wind & Water Wind Farm Modeling
1

Hi everyone,

I’ve been running simulations using FAST.Farm with the same wind conditions but varying wind directions (from negative to positive angles) and different seed numbers (50 pairs) to ensure convergence, using ‘Mod_AmbWind = 2’. Most simulations completed successfully, except for two specific seed pairs:

  • (-838449676, -902207459) and (-118803747, -247504697) ->(RandSeed1,RandSeed2)

  • Issue: The simulations fail only for negative wind directions, while all other seed pairs run without errors.

The error message I receive is:

Farm_Initialize:Farm_ValidateInput:OutFmt produces a column width of 10 instead of 20 characters.
Farm_Initialize:T1:Farm_InitFAST:FWrap_Init:FAST_InitializeAll:AD_Init:ReadInputFiles:Blade1:ReadB
ladeInputs:OpenFInpFile:The input file,
“…..\Documents\ [hidden path] \TS_15_8mps_12TI_Seeds-838449676_-902
207459_wd-9../…/…/…/…/FAST/FAST_3.5.3/fast-farm/5MW_Baseline/…/5MW_Baseline/NRELOffshrBsline
5MW_AeroDyn_blade.dat”, was not found.

The same setup works fine for positive wind directions and for all other seeds.

Question: Why would this issue occur only for these specific seed pairs (2 out of 50) and only for negative wind directions?

Any insights would be greatly appreciated!
Best regards,
Tiago Lucas

2

Dear @Tiago.Lucas,

I’m not sure, but is the path specified to the AeroDyn blade file, NRELOffshrBsline5MW_AeroDyn_blade.dat correct?

Best regards,

3

Dear @Jason.Jonkman,

Thank you for your response!

I double-checked the path to the NRELOffshrBsline5MW_AeroDyn_blade.dat file, and it is correct. The input files for different wind directions were generated using a script to ensure consistency and avoid such mistakes.

For the same seed pairs, simulations run fine for positive wind directions using the same file path. The issue happens only for negative wind directions.

Best regards,
Tiago Lucas