Open loop error

Wind & Water Controls
1

Dear all,
When I run the M-file for open-loop I encounter this error by Matlab:

Error using Run_OpenLoop (line 30)
Error reported by S-function ‘FAST_SFunc’ in ‘OpenLoop/FAST Nonlinear Wind Turbine/S-Function’:
FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption2:InflowWind_CalcOutput:CalcOutput:IfW_TSFFWind_CalcOutput
[position=(-8.2999, -15.666, 52.964) in wind-file coordinates]: Error: FF wind array was exhausted at 65.369 seconds (trying to
access data at 72.102 seconds).

Whereas previously I wasn’t faced such an error! I don’t know what file or parameter I have changed that it gives me such an error! Could you help me to solve this problem?

Thanks
Best Regards,
Sina

2

Dear Sina,

An error regarding the “FF wind array was exhausted” has been discussed many times on this forum e.g.: Error: FF wind array was exhausted - #6 by Jason.Jonkman.

I hope that helps.

Best regards,

3

Dear Dr. Jonkman,

Thanks for replying and introducing the helpful forum. The underlying reason that I didn’t get such an error is that I made a uniform wind input (without using Turbsim), which is why I could extend the time of the program. Now my question is that since it doesn’t give me any error with my own input wind, if I extend the run time and use my uniform wind and run the open loop, does it affect the open loop behavior in comparison with the default Fast wind input? I asked this question because I save the open loop data (say 400s) forever to run the closed-loop system easily.

Thanks

Best Regards,
Sina

4

Dear Sina,

I’m not sure I fully understand your question, but FAST supports both uniform wind input and turbulent wind generated by a preprocessor. Each type of wind data has its own uses.

Best regards,

5

Dear Dr. Jonkman,

Thanks for your prompt response. My question was about the dynamic of the wind turbine that I don’t know whether it is changed by the type of the wind signal or not in the first run (open loop).

Best Regards,
Sina

6

Dear Sina,

I’m still not really sure I understand your question. What are you trying to simulate?

Best regards,