Rotating Mesh without UDF
 

Hey there,
I am currently trying to make a rotating 3D wing without applying a UDF. Therefore, I have created a circular mesh zone in my outer farfield to which I applied the boolean to cut out the wing. Then I applied grid motion to it with a rotational velocity -> up to this point, everything works fine. The movement is updated and the wing is rotating. The only thing that doesn't work is that fluent created walls at the interface boundaries so that the flow of the outer mesh does not get into the inner mesh with my wing in it. Is there any way to make the boundaries permeable?

Thanks!
Alex