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-   -   SSt k-omega in gamma-Retetha transition model (https://www.cfd-online.com/Forums/main/102709-sst-k-omega-gamma-retetha-transition-model.html)

 mb.pejvak May 31, 2012 19:31

SSt k-omega in gamma-Retetha transition model

I have a question about kinetic energy production term in SST k-omega turbulence model that uses in gamma-Retetha transition model. in the Langtry's Thesis production term of K introduces:
P'k=Mt*S^2 S: absolute strain rate; Pk=min(P'k,10Dk)
but in menter's (1994) paper that SST k-omega and in main paper of the transition model refer to this paper (Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications) this term was introduces as:
p'k=mt*tij*dui/dxj tij: shear stress ; Pk=min(P'k,10Dk)
now my question exactly is which one of these two P'k is correct?

 Far May 31, 2012 22:42

it looks that both are same!!!!

 mb.pejvak June 1, 2012 04:56

Dear Far
I suspect both of them are same. if you descritize Tij*dui/dxj you can see it

Tij dui/dxj= (du/dy+dv/dx)^2+2*((du/dx)^2+(dv/dy)^2)
S^2= ((du/dy+dv/dx)^2+(du/dx)^2+(dv/dy)^2)

Am I correct?

 Far June 1, 2012 05:05

Let me check it again from my old notes

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