Inconsistent inputs for the IEA 15 MW RWT UMaineSemi

[zhilongwei]

Hi,

I noticed that some inputs for the IEA 15 MW RWT UMaineSemi differ between the FAST.Farm MD_Shared r-test case and the OpenFAST model in the IEA-15-240-RWT repository.

For example,

r-test/glue-codes/fast-farm/MD_Shared/IEA-15-240-RWT-UMaineSemi_ElastoDynT1.dat

Lines 83 to 90 in dd5feaa

	190000 HubMass - Hub mass (kg)
	1.37347E+06 HubIner - Hub inertia about rotor axis (2 or 3-blades) (kg m^2)
	0 HubIner_Teeter - Hub inertia about teeter axis (2-blades) (kg m^2)
	8.00865E+06 GenIner - Generator inertia about HSS (kg m^2)
	507275 NacMass - Nacelle mass (kg)
	1.96179E+07 NacYIner - Nacelle inertia about yaw axis (kg m^2)
	100000 YawBrMass - Yaw bearing mass (kg)
	1.83411E+07 PtfmMass - Platform mass (kg)

v.s.

https://github.com/IEAWindSystems/IEA-15-240-RWT/blob/86d51c8a1ee65be4f3686087a5c443c0b57e5cfb/OpenFAST/IEA-15-240-RWT-UMaineSemi/IEA-15-240-RWT-UMaineSemi_ElastoDyn.dat#L74-L81

Could you confirm whether the FAST.Farm MD_Shared case is intended to use the same UMaine VolturnUS-S semi-submersible platform defined in the NREL report?

https://docs.nlr.gov/docs/fy20osti/76773.pdf

Best regards

[erickaloz]

Hi Zhilong,

Apologies, I am not certain of the reason behind these differences. I think in this r-test we may have used an outdated version of the VolturnUS-S model. For the most accurate and up-to-date VolturnUS-S input files, you should use the IEA-15-240-RWT GitHub repo (https://github.com/IEAWindSystems/IEA-15-240-RWT/tree/master/OpenFAST/IEA-15-240-RWT-UMaineSemi).

[andrew-platt]

We'll update this in the OpenFAST 5.1.0 release.