Hey DrAminenwow! you are on fire, so much quicker responses.nso you are suggesting here that I should keep the casing wall in contact with rotating fluid as the default setting is moving wall relative to the fluid zone which rotating.nSliding mesh is computationally expensive, right? As I want to simulate steady-state for temperature profile, I am riding with the MRF approch. Can you please explain here, how do I set up a rigid body rotating approach? or how it will be beneficial in this problem?nThank you, mannYogeshn