Hi @Yushun.Fu
In regards to you question about the MoorDyn initialization problem:
A colleague of ours, Ryan Davies, deserves the credit for organizing the differences between different MoorDyn versions. His response:
Both WaveKin and FrictionCoefficient are options from the MoorDyn C code, and are not supported in the OpenFAST version (MD-F). For the wave kinematics file path, the correct flag is WaterKin, and the file needs to be formatted like this: https://moordyn.readthedocs.io/en/latest/inputs.html#water-kinematics-file-moordyn-f. For the friction coefficient, MD-F uses axial and transverse line friction coefficients. Those are MU_KT and MU_KA respectively. If there is an issue with the kinematics file name, it would follow whatever the OpenFAST convention on input file paths is, as MD-F uses the NWTC library for reading files.
The difference between the MD-C and MD-F options are detailed in the documentation here: https://moordyn.readthedocs.io/en/latest/inputs.html#id4.
Hope that helps.
Stein Housner