[CFD-fellow]

Originally Posted by sasasa

I tried mrf model.It produces divergence with many settings..The inner ring has to rotate.Could you list the settings.The ring is defined as a separate zone

Hi
for simulating sliding mesh (which is a sub branch of dynamic mesh, but the difference is that the cells move rigidly without any geometrical change), you should provide two interfaces locating on each other, one belong to rotating zone and the other to stationary one.Then the following procedure lead you to correct answer:
1-change the solver to unsteady
2-change the ring zone from stationary to sliding mesh
3-couple the two interfaces from define>grid interface
3-choose a time step so that the ring rotates 1 degree
4-then about 30 iteration per time step is enough in your case i think
Best regards