[flyingd]

Hi:
I want to use sas turbulent model to calculate tubulent.
But I don't konw what I will pay attention to .
Wish every one gives me some suggestion.
Thinks!

[ghorrocks]

Hi,

Only consider using these advanced turbulence models such as SAS once you know exactly what you are doing and you have shown the simpler turbulence models are not adequate.

Glenn

[flyingd]

Hi: Glenn
Thinks for your suggestions.
I know the SAS turbulent model's idea, but I use LES to simulate the turbulent, the results are good.however, I change turbulent model to SAS model, the results are not good. I use the same time step. I guess perhaps
some paremeters which I set are not good.
So, I want to ask for setting methods on SAS model.
Thinks!

[hungryfish]

F. Menter described in his paper [Revisting the turbulence scale equation] some test cases, e.g. for self-similar flows (Csas=0.54 for a round jet). I can find in the latest theory guide (12.1) that the default value in CFX is set to Cs=0.11. The question is, how can I change the value of Cs ?? The documentation (p.86) indicates compliance with zeta2=3.51 (== SAS2 Coeffiecient in CFX-Pre) , sigma_Phi=2/3 (diffusion constant), but what means SAS1- SAS3- Coeffiecient?

Regards
Gert

[mohammad]

Originally Posted by hungryfish

The question is, how can I change the value of Cs ??

Hi Dear Gert Lindner,

Have you found your answer? would you please tell me useful info you have about SAS?

Regards