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-   -   SST K- omega turbulence model (http://www.cfd-online.com/Forums/main/92199-sst-k-omega-turbulence-model.html)

mb.pejvak September 6, 2011 02:33

SST K- omega turbulence model
 
Hi
I want to apply SST K- omega turbulence model (menter 1994) in my code. in Omega equation it has one term that called 'cross diffusion term'. I don't know how to discretize this equation. in that paper Menter recommended a linearization but I can't understand it (zonal two equation K-Omega turbulence model for aerodynamic flow, Menter, 1993, formula 27 & 28). Does any one know what should I do?

thanks a lot

Eezyville September 6, 2011 10:23

Did you try looking at other resources for clues. Here's a link to NASA's website on turbulence models. http://turbmodels.larc.nasa.gov/sst.html

I hope it can be helpful to you.

mb.pejvak September 6, 2011 10:34

Dear Eezyville
thanks for your advice. yes I did. but in that site nothing was said about discritization of cross diffusion term of this model. as I said in the paper of Menter recommended a way but I can't understand it.

swetkyz September 12, 2011 15:31

mb.pejvak,

If you are already computing the partial derivatives of k and omega with respect to x_j to solve Eqns. (5) and (6) from Menter 1994, then why not simply multiply them to compute your cross-diffusion term?

Out of curiosity, what is your motivation for implementing the Menter SST model yourself instead of using preexisting software (e.g. openFoam)?

-Zachariah

lalupp September 13, 2011 05:18

cross diffusion term
 
Check the code freecfd. It is a free c++ code in which cross diffusion term has been implemented. It is in the rans module. Code is not very difficult to understand

mb.pejvak September 15, 2011 22:03

Dear Zachariah
I can't understand what you mean. but if you said that I should multiply derivation of k to omega I know that, but I want to descritize it with finite volume and with using of Green law a logarithmic function will be earned and it's impossible to apply this term implicitly.
and about your another question I want apply this turbulence model in self- developing code and It has good answer in laminar flow and I want to use it in turbulent regime.

Mehdi

mb.pejvak September 15, 2011 22:08

Dear lalupp
thanks for your helping, but I couldn't find that code you recommended. could you please give me its address or name of site that it is there?

Mehdi

lalupp September 16, 2011 00:11

Cross diffusion term
 
Pls see http://www.freecfd.com/ register and download

swetkyz September 16, 2011 08:52

Medhi,

Thank you for clarifying. I had assumed that you were using a finite difference method.


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