Reply To: Tutorial or Help for 2 way FSI

[Paul Hutcheson]

 

Hi Ashish,

I explained before the purpose of the rotational velocity is to solve the IR in the rotating frame. If you move the IR mesh, it will not map correctly to the fluid zone (since the fluid zone is not moving). If you solve the fluid in rotating frame, you need to solve the IR in the rotating frame as well. The rotation of the fluid will be achieved by a moving wall velocity on the fluid side of the IR.

I thought the ball does not rotate from mechanical contact with IR but that the fluid imparts a torque on the ball since there is a fluid film in between. If it is the fluid that rotates the ball the current workflow is valid.

As for the penetration, it seems you have displacement scaling on so it is hard to see how much penetration you actually have. Penetration is normal for contact regions, this is how contact works, but it should be small compared to the displacement.

As I said, if the ball is not rotating, you have to find out why. Is the ball receiving a torque from the fluid? Then go from there.

Paul