Instruction for the Seismic fast version

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Jason.Jonkman
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Re: Instruction for the Seismic fast version

Postby Jason.Jonkman » Thu Jul 27, 2017 1:27 pm

Dear Pierre,

Interesting results. Just two comments:
    1) The negative mean displacement is expected. The tower displacement in FAST is defined as positive in the nominally downwind direction, but the overhanging weight of an upwind rotor will cause the tower to displace slightly upwind in the absence of aerodynamic loads.
    2) For the simulation with only the second fore-aft bending mode enabled, a tower-top displacement of 0.5 m is very large (normally I would expect much less excitation/displacement of the second modes than the first), so, I would guess the nonlinearities in the response are likely the result of geometric nonlinear terms (e.g. the axial shortening) that are modeled in FAST. The geometric nonlinear terms will have a smaller effect for smaller displacements.
I hope that helps.

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

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Simon.Wiedemann
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Organization: TÜV NORD
Location: Germany

Re: Instruction for the Seismic fast version

Postby Simon.Wiedemann » Wed Dec 12, 2018 6:15 am

Hi Jason,

are there any plans to include a/the seismic modul in the latest version of OpenFAST?

Best regards,
Simon

Jason.Jonkman
Posts: 4750
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Instruction for the Seismic fast version

Postby Jason.Jonkman » Wed Dec 12, 2018 6:23 am

Dear Simon,

That would be great, but NREL has not yet had the funding to do that.

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

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov


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