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Old   June 24, 2016, 06:15
Default NEW turbulence TRANSITIONAL model
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Hi everybody, some days ago I have had notice that model k-kl-omega isn't good to predict transition and it is been corrected by this new turbulence model, recently developed:


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Originally Posted by malv83 View Post
There are a few problems with the k-kl-omega model in the farfield. One of them is the growth of Laminar Kinetic energy when separation occurs. Lopez and Walters have a paper (have not been published yet) correcting this issue:

Maurin Lopez. D. K. Walters. “A recommended correction to the k-kl-omega transition sensitive eddy-viscosity model”. Journal of Fluid Engineering.

This correction has to be made to the 2008 k-kl-omega model from now on.

Now, Lopez and Walters also developed a new transitional model (k-omega-v2) as an alternative to the k-kl-omega one. This new model has more capabilities (it is more reliable) than the k-kl-omega model, especially in the farfield computations. Fortunately the paper for this new model is already publish.

Maurin Lopez. D. K. Walters. “Prediction of transitional and fully turbulent free shear flows using an alternative to the laminar kinetic energy approach”. Journal of Turbulence, Vol 17, Iss. 3, 2016.

If you see the papers, you will immediately see how the k-kl-omega model is not good for free shear flows, and how the new model corrects all those issues. From now on, k-kl-omega users have to start using the new k-omega-v2 model.

Hope this helps

But currently I don't know if this model is been implemented in OpenFOAM. Do you have notice of this?
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Old   June 30, 2016, 03:57
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It seems they have been implemented in new OF version: http://openfoam.org/release/4-0/
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Old   June 30, 2016, 04:17
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Quote:
Originally Posted by g.freeman View Post
It seems they have been implemented in new OF version: http://openfoam.org/release/4-0/
Maybe it's just me, but I don't see any reference to k-kl or k-omega-v2 on that page?
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Old   June 30, 2016, 09:47
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No, I haven't found nothing about it too.
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