Do ShareTopo in SC as it's more reliable. It's also one less step in Fluent Meshing for whenever you do a mesh update.
Correct, assuming the faces connect then you'll have an interior face as opposed to two interface surfaces.
We can run mrf in steady or transient: sliding is transient only. The reason for using one of the other is whether the rotation changes something physical in the flow. Ie if it's a mixing tank impellor and there's a close pass between the blade and baffles you need sliding mesh. Otherwise the averaging from mrf is fine, and it's computationally cheaper.
You are navigating away from the AIS Discovery experience