Hydrodynamic analysis of OC3-Hywind spar buoy

Wind & Water Computer-Aided Engineering Software Tools
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Dear jason,

Thanks for your fast reply! I will try to use Nemoh to calculate the second-order wave loads of OC3 Hywind spar.

Best regards,
LinYang

1 Like
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Dear Jonkman,

I am working on generating 2nd- order wave forces in WAMIT. Would you mind sharing me the example of your input for 2-nd order wave solution in WAMIT?

Best Regards,
Danupon

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Dear @Danupon.Subanapong,

I don’t have second-order WAMIT files for the OC3-Hywind spar as stated above. But see my post dated August 21, 2018 in the following forum topic for an archive containing the input files for the second-order WAMIT solution of the OC4-DeepCwind semisubmersible.

Best regards,

64

Subject: Assistance with WAMIT v6.3PC to v7.3(x64) Conversion and TLPMIT Simulation Issues

Dear Forum Members,

I hope this message finds you well. It seems that you are using WAMITv6.3PC version for solving input file TLPMIT (as can be seen from the title of the TLPMIT input file). I am trying to solve it using WAMITv7.3 (x64) version.

I have been attempting to convert the original TLPMIT input files and run the simulation using WAMIT v7.3(x64). Here’s what I’ve done so far:

  1. Preparing the fnames.wam File : I created a new fnames.wam file and listed all the necessary input file names required for the simulation.
  2. Conversion Process : Using the v6v7inp utility provided with WAMIT, I attempted to convert the input files from v6.3PC format to v7.3(x64) compatible format.
  3. Simulation Attempt : After the conversion, I ran the simulation in WAMIT v7.3(x64), but encountered several errors. Specifically, the errors included messages like “Error reading scratch file for Rankine LHS, UNIT=. Error in POTEN for wave period index . Error return in POTEN, FORCE skipped, period index =.” (where *** represents various numeric outputs).
  4. Empty Output Files : Additionally, the output files TLPMIT.1 and TLPMIT.3 were generated but were empty, which I believe is incorrect.

I am at a loss as to how to proceed from here, and I kindly request your assistance in resolving these issues. Here are my specific questions:

  • Conversion Verification : Is there a way to verify that the v6v7inp conversion process was successful and all necessary files were correctly converted?
  • Error Diagnosis : Can anyone suggest possible reasons for the errors I’m encountering during the simulation? Are there any known incompatibilities between v6.3PC and v7.3(x64) that could be causing these issues?

In addition, have any of you faced similar issues while transitioning from WAMIT v6.3PC to v7.x(x64)? If so, how did you resolve them?

Your insights and guidance would be invaluable in helping me overcome this obstacle and continue with my research. I would be more than happy to provide any additional information or files that might be helpful in diagnosing the issue.

Thank you very much for your time and potential support. I look forward to hearing from you soon. :grinning:

Best regards,

Jiaxi.Yang

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Hello everyone, I have the OTF data of the Hywind platform calculated by the NEMOH software. The result format has been processed for using in OpenFAST.
https://github.com/YangL8701/Hywind-OTF

best regards