Rotating coordinates in CFX 4

P.Fonteijn

Hi all,

I am simulating turbulent flow in a rotating drum with CFX 4. For this I use rotating coordinates. The speed of the rotating frame is equal to the wall velocity in the real world.

The problem is that my measured turbulent fluctuations are much higher (one order of magnitude) than the values obtained with the simulation (with k-e, dsm or whatever). So I wonder if the turbulent kinetic energy in the simulation is based on the velocity relative to the rotating coordinate or on the supposed wall velocity in the real world.

Pascale