Mike Pettit
Ansys Employee

Hi Greg,

Sorry, this makes much more sense now. The Nonlinear Roll Damping definition is probably not much use here. To introduce nonlinear damping you should use additional Morison Disc elements, where each disc can be considered as a point Morison load on the structure. If you want to model damping along the length of each fin, you can use a row of discs.

Cheers, Mike