How do i do CFD simulation of rotating drum?

i have done the DEM simulation of rotating drum . now what to do if i want to do the CFD simulation of the same thing ?

I assume you mean that you did a granular flow simulation of a rotating drum and now you want to do a coupled (fluid + DEM) simulation?

MFiX does not re-mesh the geometry. So to do a rotating drum with both fluid and solids, rotate the gravity vector so you don’t need to re-mesh.

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yes you were right , but again how do i rotate the gravity vector ?
i am beginner in mfix.