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use of Reynolds stress in CFX-post if possible?

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Old   October 19, 2007, 05:12
Default use of Reynolds stress in CFX-post if possible?
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I am using CFX for turbomachinery cfd prediction.

I don't know whether it is possible to use reynolds

stress components in CFX-post without the application

of reynolds stress models?

Thanks in advance.

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Old   October 19, 2007, 08:05
Default Re: use of Reynolds stress in CFX-post if possible
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The Reynolds stress tensor (tau_ij) for an incompressible fluid in a eddy-viscosity model is defined as:

tau_ij = - u_i u_j = nu_t (partial U_j/partial X_i + partial U_i/partial X_j)

In CFX-post all derivatives of U_j or velocity vector are available. You may compute u_iu_j for the inner field without any problems. At the near-wall cell, I am not sure if eddy viscosity or nu_t values in CFX-post are correctly set.

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Old   October 24, 2007, 19:31
Default Re: use of Reynolds stress in CFX-post if possible
Jonathan Lemay
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Dear July

Did you finally find out how to compute the Reynolds Stress with the K-E model for example. I did understand Kumar explication about the definition of the tau_ij, but when it comes time to applicate it in CFX it is different. How did you compute the turbulente viscosity?

Thanks anyone for more specification about the Reynolds tensor.

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