How to input platform motions time series and observe the responses.

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Danupon.Subanapong
Posts: 19
Joined: Sun Jul 17, 2016 11:30 am
Organization: University of Tokyo
Location: Japan

How to input platform motions time series and observe the responses.

Postby Danupon.Subanapong » Wed Apr 24, 2019 3:42 am

Hello,
I am now working on Floating Offshore wind turbine modelling. I have to give FAST the platform motions as an input in order to see the responses caused by effect of floater motion. I have been using FAST for a while, but only see that FAST can give initial displacement(s). So, I would like to ask is there any way to input floater motions to FAST?
Thank you so much,
Best Regards,
Danupon Subanapong

Jason.Jonkman
Posts: 4864
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
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Re: How to input platform motions time series and observe the responses.

Postby Jason.Jonkman » Wed Apr 24, 2019 6:35 am

Dear Danupon,

You cannot directly specify 6-DOF motion of the platform in FAST / OpenFAST without customization of the source code.

For the 3 platform translation modes, you can use FAST v7's Seismic module to prescribe time histories of motion--please see my post dated Aug 29, 2012 in the forum topic found here for more information: viewtopic.php?f=4&t=652.

Related questions have been discussed on this forum e.g.:
viewtopic.php?f=30&t=1259
viewtopic.php?f=3&t=1572&p=7172
viewtopic.php?f=4&t=831&p=3382

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

Danupon.Subanapong
Posts: 19
Joined: Sun Jul 17, 2016 11:30 am
Organization: University of Tokyo
Location: Japan

Re: How to input platform motions time series and observe the responses.

Postby Danupon.Subanapong » Wed Apr 24, 2019 7:56 am

Dear Jason Jonkman,
Thank you so much for your quick reply. I understood that it is not possible in FAST/OpenFAST. However, I know that FAST has interface with Orcaflex. In Orcaflex, the motions can be specified as input. So, the tower load responses can be obtained from FAST output. However, as far as I've tried it has not been successful yet. Can you please give me some suggestion? I wonder if I can do this way or not.
Best Regards,
Danupon Subanapong

Jason.Jonkman
Posts: 4864
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: How to input platform motions time series and observe the responses.

Postby Jason.Jonkman » Wed Apr 24, 2019 8:52 am

Dear Danupon,,

I'm not familiar with that functionality of OrcaFlex, but I would be surprised if the motion of the platform in FAST / OpenFAST could be controlled by OrcaFlex. This is because the FAST / OpenFAST interface to OrcaFlex is set up to pass the platform motions from FAST / OpenFAST to OrcaFlex and the hydrodynamic and mooring applied loads are passed from OrcaFlex to FAST / OpenFAST.

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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