error when conduct simulation using OLAF& turbulent wind

[HelenLeeeeee]

Dear all， Sorry to bother you, I used the OpenFAST v3.5.1 from Releases · OpenFAST/openfast · GitHub to conduct simulation, but here is still an error which is same as #1746 when I used an Turbsim FF inflowfile . Here is my error. Best regards,

Originally posted by @HelenLeeeeee in https://github.com/OpenFAST/openfast/issues/1746#issuecomment-1783801369

[andrew-platt]

Dear @HelenLeeeeee,

Is the wind file you are using one you generated, or one from the repository? The error is consistent with trying to use a non-periodic TurbSim file with the simulation.

This is slightly different than the error in #1746 as that error occurred in the middle of the simulation, but this error occurs at the start.

Regards

[HelenLeeeeee]

Dear @HelenLeeeeee,

Is the wind file you are using one you generated, or one from the repository? The error is consistent with trying to use a non-periodic TurbSim file with the simulation.

This is slightly different than the error in #1746 as that error occurred in the middle of the simulation, but this error occurs at the start.

Regards

Dear @andrew-platt, The wind file I am using is I generated with Turbsim. Also, I had a similar error driving the latest version of aerodyn_driver_x64.exe (with the same inflowwind file), but not at the beginning, at 17 seconds. For reference, here are the settings for my "dvr"、"aerodyn15.dat" 、"Inflowwind.dat''、"inp" and"olaf.dat", the OLAF file parameters are generated based on the parameters and the python file given in the user document.

Best regards,

[andrew-platt]

Dear @HelenLeeeeee,

For the error with negative time, one change that you can make is to generate the TurbSim file with periodic winds*. To do this, set the UsableTime to All. This will allow InflowWind to access negative times and should allow the simulation that with the error at -0.1426 s to proceed as normal. I suspect this will also take care of the issue at 17 seconds (negative time is accessed there as well).

*Since the wind is generated by FFT, the wind at the end of the file will match the wind at the beginning of the file effectively allowing it to wrap around in time/x-dimension. This allows negative times to be accessed in the wind file. However, this only occurs if the UsableTime is set to All.

Regards,

[XiangWang12]

Dear @andrew-platt, Sorry to bother you, I used the latest version of OPENFAST to do some simulations. Currently I'm trying to use the OLAF and Turbsim to run the 5MW_Semi test. I have already set the the UsableTime to All, but a new error occurs and I have no idea how to handle it. Here is my error. And below are some of my input files. I used to think that the issue might have been caused by different versions of Turbsim, but in reality, even after using different versions of Turbsim, the problem still persists.