- Correct, the mesh must be continuous for your study
2)Unless you want to also simulate the cooling of the disc (in which case you need to switch to conjugate heat transfer sovler) what you need to do is mesh the area around the disc and duct, not the disc an duct themselves. There was another very similar question posted today (link below) and if you read the replies, you will see they explain how to mesh the area around the solid objects.