Dear Ali,
I think you meant to say: JtdOmega_r/dt=Ta-TemGB.
Regardless, when running FAST v8, the rotor inertia, Jr, is written to the ElastoDyn summary file. For the NREL 5-MW turbine, the rotor inertia is 38,759,228 kgm^2.
Best regards,
Dear Ali,
I think you meant to say: JtdOmega_r/dt=Ta-TemGB.
Regardless, when running FAST v8, the rotor inertia, Jr, is written to the ElastoDyn summary file. For the NREL 5-MW turbine, the rotor inertia is 38,759,228 kgm^2.
Best regards,