Reynolds Stress Models

Roued

Hi, every one

I have e general question about using the Reynolds Stress models (RSM and ASM) within CFX.

When simulating air flow in ventilated enclosures like a building or a room, the quality of the prediction made by the Reynolds Stress models are poor compared to the two-equations model like k-eps, low-Reynolds k-eps or the low-Reynolds k-omega models. (Comparing velocity profiles, between different turbulence model and experiments).

The flow is in general low-Reynolds (RE approx. 4000-5000). Room has slot inlet and outlet in full width of the room.

Why does the RSM make such a poor prediction ???

Any hints ???

Only standard parameter are used both in the Reynolds Stress Model and the other two-equations models.

Thanks in advance.

Best Regards

Roued