Hi, does anyone simulate rotating fluids? I´m trying to simulate the flow inside a tubular centrifuge but I have a lot of convergence problems up a certain Reynolds number (1000). I use Reynolds stress model to simulate the turbulences. I would appreciate any help!

Xiana

Initialise your RSM model with an isotropic turbulence model's results.

I would try... check the mesh refined and time step.

Also try FMG initialisation and run with PRESTO if using pressure based solver

first of all u need to know by the data (i mean any experimental data availabe or any information available ) whether u r in turbulkent regime or not if not then y r u using turbulence model. i m also working in cfd field on centrifugal rotators only, but does ur system contains 2 fluids or only single fluid wat is the system can u tell me in detail , bcoz my system consists of 2 fluids, hence me using vof model , anyway tell me wat is the system

Thank you for your advices. The problem is that I have no yet experimental data (I´m working on it but it´s going to go for a long time.I´ve tried with turbulence models because it didn´t converged with laminar, but i think the problem is there. I simulate only one fluid and then, when streams are converged, I make some particle injections (concentration is very low and DPM works good). I simulated the interface fluid-air once with the VOF model and now I define this interface as a wall with no shear stress. The external wall and the blades of the centrifuge are moving walls and the fluid rotate in a moving reference frame. Do you think is a good formulation?

Xiana