Reply To: Tutorial or Help for 2 way FSI

[Paul Hutcheson]

In the reference frame of the IR, the balls are not translating.

The animation you show shows motion in the absolute frame. You are not solving this problem in the absolute frame.

Your Mechanical setup should also reflect this. Only RZ should be free, the other 5 DOF should be fixed.

You can check if remeshing is sufficient indeed.