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Andrea Giusti April 1, 2010 08:35

kOmegaSSTSAS
 
Dear OpenFoam 1.6 users and experts,
I'm trying to use the LES turbulence model "kOmegaSSTSAS". I noticed some differences between the implemented version and the reference**. The main difference is the SAS source term in the omega equation: in the reference there is a (L/Lvk2)^2 (squared) instead of a simple L/Lvk2 (the coefficients of this term are also different). I'm doing a master thesis in CFD using this model, so I'm aware of how the model works. In the study of this model I discovered that the first version by Menter has a simple L/Lvk2 and later this term has been squared. Underlining that the other coefficients of the implemented model are the same of the reference (except those of the SAS source term), I have two questions:

1) Is the difference I noticed a bug?
2) Is the implemented kOmegaSSTSAS an old version of the model and so it needs to be updated?

Any help would be greatly appreciated!


**Reference:
DESider A European Effort on Hybrid RANS-LES Modelling:
Results of the European-Union Funded Project, 2004 - 2007
(Notes on Numerical Fluid Mechanics and Multidisciplinary Design).
Chapter 8 Formulation of the Scale-Adaptive Simulation (SAS) Model during
the DESIDER Project.
F. R. Menter and Y. Egorov.

waynezw0618 April 1, 2010 10:42

Hi
There are two version of SST based SAS model

2007 version :
Egorov, Y.,and Menter, F. ,
“Development and Application of SST-SAS Turbulence Model in the DESIDER Project”,
Second Symposium on Hybrid RANS-LES Methods, Corfu, Greece, 2007

2005 version :
Menter, F.R. and Egorov, Y.,
"A Scale-Adaptive Simulation Model using Two-Equation Models",
AIAA paper 2005-1095, Reno/NV, 2005.

here maybe the old version. and Fsas=1.25,this parameter is not in 2007 one .

you may modified this to new the one.
wish helps!

wayne


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