HydroDyn - example .1, .3 and .hst files

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Jack.Hughes
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Joined: Thu Feb 14, 2019 10:15 am
Organization: Swansea University
Location: United Kingdom

HydroDyn - example .1, .3 and .hst files

Postby Jack.Hughes » Fri Feb 15, 2019 3:30 am

Hi, I am currently trying to use HydroDyn however I don't have access to WAMIT. In trying to convert NEMOH outputs to the correct format, I am struggling to find example of the relevant *.1, *.3 and *.hst files. Would you be able to point me in the right direction for this kind of conversion or towards some exemplary files to compare against?

Kind regards,
Jack Hughes

Jason.Jonkman
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Re: HydroDyn - example .1, .3 and .hst files

Postby Jason.Jonkman » Fri Feb 15, 2019 6:31 am

Dear Jack,

The format of the WAMIT-generated output files (*.1, *.3, and *.hst for first order, etc.) needed by HydroDyn can be found in Chapter 4 of the WAMIT User’s Manual, available online: http://www.wamit.com/manual6.4/Chap4.pdf. We also have examples of these files in the CertTest directories of FAST v8 (https://nwtc.nrel.gov/FAST8), the standalone HydroDyn archive (https://nwtc.nrel.gov/HydroDyn), and the OpenFAST r-test (https://github.com/OpenFAST/r-test).

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

Jack.Hughes
Posts: 3
Joined: Thu Feb 14, 2019 10:15 am
Organization: Swansea University
Location: United Kingdom

Re: HydroDyn - example .1, .3 and .hst files

Postby Jack.Hughes » Thu Feb 21, 2019 4:46 am

Thanks Jason,

I'm wondering if it is possible to use OpenFAST in a model neglecting all rotor, drivetrain, nacelle and tower information in the ElastoDyn input file in order to create a model which only considers the floating platform, HydroDyn and MoorDyn?

Kind regards,
Jack Hughes

Jason.Jonkman
Posts: 4614
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: HydroDyn - example .1, .3 and .hst files

Postby Jason.Jonkman » Thu Feb 21, 2019 8:39 am

Dear Jack,

You can't eliminate the blades, drivetrain, nacelle, and tower from an OpenFAST model, but you can set the inputs so that terms associated with the blades, drivetrain, naccelle, and tower are zero or negligible. For example, you should disable wind inflow, aerodynamics, and control; disable the blade, drivetrain, and tower degrees of freedom in ElastoDyn; set the geometry so that the blade and tower lengths are zero; and set the masses and inertias to zero or negligible values, etc.

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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