How to convert from WAMIT file to FAST input file (.1.dat)

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hailey.seo
Posts: 4
Joined: Tue Jul 11, 2017 4:30 am
Organization: Newcastle University
Location: Newcastle

How to convert from WAMIT file to FAST input file (.1.dat)

Postby hailey.seo » Tue Jul 11, 2017 7:24 am

Hello,

Thank you for your attention.
I'm studying a coupled response of TLP floating wind turbine. While doing a calculation in FAST, I found my WAMIT file from SESAM HydroD should be changed to the proper input file for FAST. Could you explain how to convert from WAMIT(1.dat and 3.dat) file to FAST input file?
Herein the files are attached.

Thanks.
Hailey.Seo
Attachments
WAMIT_5S.3.txt
WAMIT_5S.3.txt
(349.31 KiB) Downloaded 117 times
WAMIT_5S.1.txt
WAMIT_5S.1.txt
(53.16 KiB) Downloaded 87 times

hailey.seo
Posts: 4
Joined: Tue Jul 11, 2017 4:30 am
Organization: Newcastle University
Location: Newcastle

Re: How to convert from WAMIT file to FAST input file (.1.dat)

Postby hailey.seo » Tue Jul 11, 2017 9:22 am

In addition to above questions, could you please check some error messages like below;
It didn't work although I have not changed any function in your sample files (Test23.fst) except time range from 60s to 1000s. I checked Test24 and Test25 for semi and spar works very well.
--------------------------------------------------------------------------------------------------------------------
Timestep: 65 of 1000 seconds. Estimated final compleation at 16:17:32.

FAST_Solution : CalcOutputs_And_SolveForInputs:SolveOption2:InflowWind_CalcOutput : CalcOutput:IfW_TSF
FWind_CalcOutput [position=(-8.523, -19.844, 50.377) in wind-file coordinates]:Error: FF wind
array was exhausted at 65.35 seconds (trying to access data at 72.102 seconds).

FAST encountered an error at simulation time 65.338 of 1000 seconds.
Simulation error level : FATAL ERROR

Aborting FAST.

------------------------------------------------------------------------------------------------------------------------------------

Jason.Jonkman
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Location: Boulder, CO
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Re: How to convert from WAMIT file to FAST input file (.1.dat)

Postby Jason.Jonkman » Tue Jul 11, 2017 12:58 pm

Dear Hailey,

I haven't looked at your files in detail, but 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. Section 6.8.4 of the draft HydroDyn User's Guide and Theory Manual provides HydroDyn-specific requirements: https://wind.nrel.gov/nwtc/docs/HydroDyn_Manual.pdf.

An error regarding the "FF wind array was exhausted" has been discussed many times on this forum e.g.: viewtopic.php?f=4&t=1450&p=8249.

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


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