Error in zero-gap overset mesh
 

Dear all,

I want to simulate two counter-rotating solid cylinders that have contact with each other at their circular base. I want to put each cylinder in an overset region and also I want to have a background region.

I added five prism layers around each cylinder. when I set the two cylinders as zero-gap overset meshes and I initialize the simulation, the mesh at the edge of the contact surfaces become strange [SEE THE PHOTO PLZ]
I would appreciate someone could help me with this problem.