Turbsim - how to run 60 minutes simulations with repeating 10 min turbsim output files

Wind & Water Computer-Aided Engineering Software Tools
1

Hi, according to the IEC 61400-3-x standards, it is possible (and even recommended) to use repeating 10 minutes turbulent wind input files when performing a 1 hours simulation (for example for DLC 6.1). How is it possible in OpenFAST to read a 10 min TUrbsim output simulation and set it to repeat 6 times? Or 6 .bts files shoudl be somehow merged?
Thanks

2

Dear @Maurizio.Collu,

TurbSim can generate periodic wind data files that repeat, which OpenFAST can use to run longer simulations with repeated wind data. To generate a repeated 10-minute (600-s) simulation, set WrADFF = True (for TurbSim wind data format), AnalysisTime = 600 s, and UsableTime = “ALL” in TurbSim.

Best regards,

1 Like
3

Thanks a lot @Jason.Jonkman for the super-quick answer.
So, if I understood well, the TurbSim output file still have the size of a 10-min file, but OpenFAST will know to just repeat it.
Does this end-to-start time history joining leads to some wind speed discontinuities?

Thanks

4

Dear @Maurizio.Collu,

That is correct. Moreover there is no discontinuity at the end-to-start repeat.

Best regards,

5

Dear @Jason.Jonkman ,
I followed your advice
" set WrADFF = True (for TurbSim wind data format), AnalysisTime = 600 s, and UsableTime = “ALL” in TurbSim." in Turbsim v1.5 but it displays with error that " The error occurred while trying to read the usable output time".
Is that only valid for Turbsim V2?

Best regards,

6

Dear @TianCheng.Yao,

That is correct. The UsableTime = “ALL” functionality of TurbSim is only available in v2.00 and newer. You can the newest version of TurbSim in the OpenFAST GitHub repository: Releases · OpenFAST/openfast · GitHub.

Best regards,