Turbsim Results in FAST

Hello everyone,

I’ve been building a FAST model for a small scale wind turbine by editing Test17. I’ve also generated wind speed time histories using Turbsim. I can see the message “FAST terminated normally” when I use uniform wind speed but when I want to use the Turbsim results, I see this error:

I cannot figure out what the source of error is. I think it might be ntdll.dll that causes subsequent errors in KERNEL32.DLL and FAST_Win32.exe. I did not find this file in FAST and Turbsim folders I have. I’ve tried both the 32-bit and 64-bit versions of FAST and Turbsim and this error still persists. I’me using FAST_v8 and Turbsim_v1.06. Could you please help me solve this problem? Thank you.

Best Regards,
Omid Bahrami

Dear Omid,

I’m not sure what is causing this problem. Because of the optimization level set for compiling in release mode, the actual line of code triggering the program exception is showing up as “Unknown” in the list. You’ll likely need to recompile in debug mode and rerun the case to identify the problem.

One thing that looks odd to me in the message is that you are using 1000-Hz data in the turbulent wind file. Why is this so high? Normally we use a turbulent wind file time step of 0.05 s, corresponding to 20-Hz data. I’m just guessing here, but perhaps there is a problem in the code related to how the wind data is processed at a much smaller time step? Perhaps the use of the double precision version of FAST v8 would help? Do you have the same problem if you upgrade from FAST v8.12 to the newest release, FAST v8.16?

Best regards,