# Turbulence Models.

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 June 27, 2001, 07:17 Turbulence Models. #1 Gavin Brady Guest   Posts: n/a I have been asked to use a "Realizable k-eplsilon" model in my industrial project for my masters. Does anyone know what is the fundamental difference between this and the standard "k-eplsilon" model? All comments appreciated. Cheers.

 June 27, 2001, 07:55 Re: Turbulence Models. #2 sylvain Guest   Posts: n/a Hello, The name Realizable k-epsilon model is used by Fluent for the Shih, Zhu and Lumley evolution of the k-epsilon model. It refers to several NASA/ICOMP papers. The final and "really" realizable version of this model is describe in the following paper "Developments in Computational Modeling of the Turbulent Flows" - Tsan-Hsing Shih - NASA Contractor Report 198458 - ICOMP-96-04; CMOTT-96-03 - February 1996. The main features of this model are the following : - uu = 2/3*k - 2*c_nu*k^2/eps*dU/dx can NOT be negative since c_nu is no more a constant. - the production term of the epsilon equation is equal to c_1*eps*S instead of c_eps_1*c_nu*k*S^2, where c_1 is NOT a constant. This last item gives a better stability to the turbulence model. Hope that helps, Sylvain

 July 14, 2001, 02:27 Re: Turbulence Models. #3 Max Guest   Posts: n/a simply speaking, realizable k-e models impose some conditions, usually derived based on some turbulence physics arguments, to prevent k and e (or some parameters derived from k and e) from going to wrong values...

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