Ansys Employee
Read up on precessing vortex cores: you've probably refined the mesh sufficiently to pick up the transients in the flow field. Also have a look at the model limitations for k-e and k-w models in highly swirling flows: hint, read up on the Reynolds Stress Model. nmakes good points; in this case y+ is less important as the complex flow is away from the wall: so you need to resolve the volume as well as the near wall. You also want to look at using a hex or poly mesh. n