Reply To: Tutorial or Help for 2 way FSI

[Paul Hutcheson]

Hang on a minute - do you want to set a velocity here for the ball wall?

The ball is a system coupling boundary, so the mechanical ball is free to rotate and will send displacements to Fluent.

If the ball receives a torque from the fluid, it will rotate, and move the mesh in Fluent. 

So in this case you want to keep stationary ball wall relative to adjacent cell zone.

You also need to have a dynamic mesh setup in Fluent that is prepared for the ball rotation. So long as the ball will only rotate in Fluent (and not translate), sliding mesh or overset would be sensible. We discussed this is an option using remote displacement or revolute joint in mechanical.