Rigid OWT

Provide feedback, request enhancements, and get help with wind-turbine computer-aided engineering tools.

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Posts: 27
Joined: Tue May 15, 2018 6:00 am
Organization: Dalian University of Techology
Location: China

Rigid OWT

Postby Zhou.Lin » Fri Feb 14, 2020 11:34 pm

Dear Jason,

I'm using FASTv8 simulation of monopile-type OWT, but I want to compare the difference of the Flexible OWT and Rigid OWT, but Rigid OWT I should how to adjust parameters, is in subdyn adjust the rigidity and damping, or locked platform of six degrees of freedom(DOF), if neither. Can you tell me how to simulate the Rigid OWT.

Thank you very much! I am Looking forward to your reply!

Best regards,


Posts: 4539
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO

Re: Rigid OWT

Postby Jason.Jonkman » Sat Feb 15, 2020 11:52 am

Dear Zhou.Lin,

Setting CBMod = True with Nmodes = 0 in SubDyn will eliminate the Craig-Bampton modes of the substructure. Disabling the platform DOFs in ElastoDyn (PtfmSgDOF = PtfmSwDOF = PtfmHvDOF = PtfmRDOF = PtfmPDOF = PtfmYDOF = False) will further eliminate the Guyan modes of the substructure. Combined, the substructure will be modeled completely rigidly.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
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