Keyur Kanade
Ansys Employee

Did you check the mesh before starting simulation? Did it pass the check?

When you created mesh, what was the quality. Please check orthogonal quality of the mesh. The min ortho must be more than 0.1. 

Also did you use non conformal interface of sliding mesh? Did you define the axis of rotation correctly in Fluent?

Please have a look at following for sliding mesh.