Hi guys, I have a co-worker here who is stuck on a problem, and I cannot give him much help either. He is trying to model a multiphase flow with no inlets or outlets. The problem is essentially a rotating cylinder inside of a pipe that is sealed on both sides. Assume that the pipe is half filled with water. That's it. We are trying to do this in CFX, but having difficulty determining what, if any, boundary conditions can be applied. The Ansys people are of very little help, it any. Any suggestions?