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Old   September 6, 2011, 02:33
Default SST K- omega turbulence model
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Mehdi
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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
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Old   September 6, 2011, 10:23
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Chris
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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.
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Old   September 6, 2011, 10:34
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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.
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Old   September 12, 2011, 15:31
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Zachariah Swetky
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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

Last edited by swetkyz; September 13, 2011 at 08:11. Reason: Clarity
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Old   September 13, 2011, 05:18
Default cross diffusion term
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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
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Old   September 15, 2011, 22:03
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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
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Old   September 15, 2011, 22:08
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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
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Old   September 16, 2011, 00:11
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Pls see http://www.freecfd.com/ register and download
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Old   September 16, 2011, 08:52
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Medhi,

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