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OpenFAST / openfast

Main repository for the NREL-supported OpenFAST whole-turbine and FAST.Farm wind farm simulation codes.
http://openfast.readthedocs.io
Apache License 2.0
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Openfast simulation time #965

Open engineerYuXN opened 2 years ago

engineerYuXN commented 2 years ago

Dear all， I have some questions about OpenFast simulation time. I want to carry out the simulation calculation of 10800s, but I don't know why the error is always reported, so I would like to ask you .Here are my Settings.

.fst fst

Hydrodyn hydrodyn

InflowFile inflow

错误2

I have a few more questions about simulation: 1.Do I need to modify the parameters of ElastoDyn and ServoDyn if I want to conduct 10800s simulation? 2.Whether the turbulent wind generated by Turbsim in InflowFile needs to be consistent with the simulation time?

If you need more analysis input information, please contact me.

Best regards.

whisperingkahuna commented 2 years ago

I believe you cannot change the DT value (Recommended module time step (s)) which is 0.0125s in the .fst file. Try with the actual value (0.0125s)

jjonkman commented 2 years ago

Dear @engineerYuXN,

It looks like your OpenFAST model is unstable, resulting in unrealistically large wind turbine deflections very soon in the simulation. I agree with @whisperingkahuna that the time step may be too large (the actual time step required will be dictated by the natural frequencies inherent in the model).

Best regards,