FASTV8-HydroDyn-Wavemod4

Discuss theory and modeling of wind-turbine structures.

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Lixian.Zhang
Posts: 7
Joined: Wed Dec 05, 2018 11:04 pm
Organization: Dalian University of technology
Location: China

FASTV8-HydroDyn-Wavemod4

Postby Lixian.Zhang » Tue Dec 03, 2019 6:10 pm

Dear Dr.Jason

Thanks for reading my message.
I have some problems with the wavemod4. Here is my question:
I'm trying to consider the modifed Jonswap spectrum in shallow water depth. So i need to multiply the Jonswap spectrum with the TMA factors to consider the shallow water effect. Fisrtly, I just multiply the original Jonswap spectrum with the TMA factors in Hydrodyn source code(waves.f90), and it failed. Is there any exmaple for the use of wavemod4? In your reference mannual, it said that the user-difined spectrum can modifie the waves.f90 source code. Can we redifine other parameters in the source code?
If wavemod4 didn't work, can we use the inverse Fourier transform to transform the modifed spectrum into time-domin in MATLAB,and then input it into the FAST(use wavemode5)?

Thanks very much! I am looking forward to your reply.

Best regards
Lixian Zhang

Jason.Jonkman
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Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
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Re: FASTV8-HydroDyn-Wavemod4

Postby Jason.Jonkman » Wed Dec 04, 2019 7:07 am

Dear Lixian,

What do you mean when you say that you modified Waves.f90 and "it failed"? To use WaveMod=4, all you should need to change is how WaveS1Sdd is set in SUBROUTINE Waves.f90/UserWaveSpctrm(). The sample UserWaveSpctrm() SUBROUTINE provided in FAST v8 simply sets WaveS1Sdd = 0.

Being open source, you can, of course, change the FAST source any way you want.

If you already have a wave-elevation time series that you want to use within FAST, then you can also use the WaveMod=5 option.

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

Lixian.Zhang
Posts: 7
Joined: Wed Dec 05, 2018 11:04 pm
Organization: Dalian University of technology
Location: China

Re: FASTV8-HydroDyn-Wavemod4

Postby Lixian.Zhang » Thu Dec 05, 2019 1:50 am

Dear Dr. Jason

Thanks for your reply!

Best regards
Lixian Zhang


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