Directional Wave Spreading

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

Directional Wave Spreading

Postby Danupon.Subanapong » Sat Feb 16, 2019 6:35 am

Hello!!!
I have a question about directional wave spreading in HydroDyn. As far as I understand, HydroDyn can include directional wave spreading function using cos-2s model. A small s which is the directional wave spreading parameter is a function of frequency. However, I found that the input of s in HydroDyn is defined as a constant value. So, I would like to ask about how to define s? Could you please explain me?

THANK YOU
Danupon Subanapong

Jason.Jonkman
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Location: Boulder, CO
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Re: Directional Wave Spreading

Postby Jason.Jonkman » Sun Feb 17, 2019 4:48 pm

Dear Danupon,

In the HydroDyn hydrodynamics module of FAST / OpenFAST, the wave directional spreading is not frequency dependent. We wrote a paper for OMAE 2014 when we first introduced wave directional spreading in HydroDyn; please review this paper for more information on the approach implemented: https://www.nrel.gov/docs/fy14osti/61161.pdf.

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: Directional Wave Spreading

Postby Danupon.Subanapong » Sun Feb 17, 2019 6:56 pm

Thank you so much!!!!


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