Reply To: Tutorial or Help for 2 way FSI

[Paul Hutcheson]

 

Hi Ashish,

Ok I’m a bit surprised, as in the animation you wanted to follow there was no ball translation, and previously we were proceeding on the basis that the balls were rotating with the IR (as in the animation).

So what you’re saying is the balls do not rotate with the IR speed, but at a speed slightly different due to some slipping? This is not going to work with the domain you have currently, as the ball will move out of the domain and lose contact with the surrounding structure(!).

Is this ball motion pre-defined, or do you want to predict it?

If it’s pre-defined/constant, you could solve the whole problem in the reference frame of the ball, since IR and OR are surfaces of revolution.

Then you need to adjust wall boundary conditions accordingly.

If this new ball motion is an output not an input, I think the only solution is to model the full 3D geometry – but prediction of such motion will be extremely complex and prone to divergence – I wouldn’t recommend it with this type of high fidelity FSI approach.

Paul