The matching issue between the ExtPtfm module in OpenFAST v2.3.0 and the ExtPtfm.dat file and ExtPtfm_SE.dat file in the current r-test repository of OpenFAST on GitHub.

[Steven647]

Dear All,

First of all, I would like to express my sincere appreciation to the developers of OpenFAST for their continuous contributions to this software and the positive atmosphere in the GitHub discussions.

Recently, I have been attempting to prescribe the motion of 5MW floating offshore wind turbine in OpenFAST V2.3.0. As mentioned in the Issue #617 titled "Develop Prescribed Platform Motion capability with aero-elasticity", I aim to achieve the prescribed motion of the turbine by applying loads through ExtPtfm module.

I have used the example ExtPtfm.dat and _ExtPtfm_SE.da_t files provided in the current r-test repository of OpenFAST. However, when running OpenFAST, I encountered the error shown in the image below.

Therefore, I would like to inquire whether the reason for the error is a mismatch between the versions of OpenFAST v2.3.0 and the two input files used for ExtPtfm module. If the error is indeed due to the version mismatch, and considering that I am currently coupling OpenFAST v2.3.0 with SOWFA, which is a wind farm wake simulation software, is it possible to modify the input files of the ExtPtfm module without changing the version of OpenFAST to make OpenFAST successfully invoke the ExtPtfm module and achieve the prescribed turbine motion?

Looking forward to your answers!

[jjonkman]

Dear @Steven647,

Can you clarify where you obtained the ExtPtfm.dat and ExtPtfm_SE.dat files you are using from? Are you referring to those available from the readthedocs: https://openfast.readthedocs.io/en/main/source/user/extptfm/appendix.html?

Best regards,

[Steven647]

Dear @jjonkman ,

Thank you very much for your reply.

As you said, the ExtPtfm.dat and ExtPtfm_SE.dat files that I am using
are from the readthedocs: https://openfast.readthedocs.io/en/main/source/user/extptfm/appendix.html.

Do you think this is an error caused by the version mismach? Furthermore, is it possible to modify the input files of the ExtPtfm module without changing the version of OpenFAST to make OpenFAST successfully invoke the ExtPtfm module and achieve the prescribed motion of wind turbine?

Best Regards,

[jjonkman]

Dear @Steven647,

According to pull request history, the current version of the ExtPtfm module that relies on the input files you are using was introduced in OpenFAST v2.4.0 via the following PR: #344. To use this version of ExtPtfm within OpenFAST v2.3.0 will require that you merge this PR into the v2.3.0 code base and recompile.

Best regards,