[yvar]

Hi!

I am beginner with ansys cfx (v12) and have the next question

My challenge is a big water tank with some thin internal walls (it can be any configuration). Inlet is big hole from one side of the tank. Outlet is a small hole from the other side.
BCs: inlet - opening with some relative pressure; outlet - mass flow rate. Also rotating periodicity is used.
Flow velocity in main volume is slow, but high in the outlet

My problem is:
Solution gives flow trajectories with a lot of local swirlings. Flow moves not in straight direction (as seems to be logical in my model), but turns and flows in any other directions.
BUT I saw CFD analysis of such unit where flow trajectories were straight, uniform and logical...
I tried different turbulence models, remeshed model with smaller size but the pattern did not change significantly. Also tried change boundary conditions - no success..

So the questions are: 1. Can type of elements give so significant difference in flow behaviour? i mean if to remesh model with hexa, not tethra
2. I tried all given in CFX turbulence models, but without any additional controls.. all by default. Could you advice which turbulence model is more suitable for such task?

hope here is enough info.. thanks in advance for any advice!

Regards