[vavnoon]

Hello everyone,

I am trying to make a simulation of a rotating tank with a non-circular cross-section.
I have read the Fluent guide book. I think I have to use the single frame motion method for this simulation. It is expected that the rotational velocity of the fluid is not constant over the whole domain at least for some first seconds. But the results show the constant omega.

If I just rotate the wall (moving wall for b.c.) without mesh motion, the wall and the mesh will not match during the simulation.
If I rotate the wall and use define_grid_motion macro for the rotation of the mesh without any deformation, I think it will be the same as the mesh motion method that I tried before and I took the constant omega.

Could you please guide me in this regard?
Thank you so much for your time.