# The k-epsilon model

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 August 24, 2004, 10:54 The k-epsilon model #1 Luis Guest   Posts: n/a The linear k-epsilon model assumes that the turbulence viscosity is linked to the turbulence kinetic energy and dissipation via the relation: μt=Cμ*ρ*k^2/ε Where Cμ is a constant (k-e Turbulence model constant). However, this linear model is inappropriate for swirl flows. Hence, a Cμ as a function of a shear parameter is usually defined to represent better those type of flows. Therefore, I would like to ask if is a way to define Cμ as a non constant parameter (as a function) using CFX 5.6 or 5.7

 August 25, 2004, 23:38 Re: The k-epsilon model #2 Jeff Guest   Posts: n/a You're better off using a Reynolds Stress model which solves the anisotropic Reynolds stresses in swirling flows. Hint: start with k-epsilon, and then restart using the Reynolds Stress model. Jeff

 August 26, 2004, 10:59 Re: The k-epsilon model #3 Luis Guest   Posts: n/a Thank you Jeff, but because I have no computer power right now, I have to use the k-epsilon model until I get a definite model. Any other suggestions that could help me? Luis

 August 26, 2004, 22:12 Re: The k-epsilon model #4 Jeff Guest   Posts: n/a I haven't looked at the CCL for the turbulence models, but C_mu should be a CCL parameter (option). Look in the rules file (under the /etc directory....but don't modify this file!!!) for the k-epsilon section and see if the model constants are parameters. If they are, your can edit your CCL file and set the model constant to a CEL variable. The CEL variable can then be a function of just about anything. Jeff

 August 27, 2004, 20:42 Re: The k-epsilon model #5 Luis Guest   Posts: n/a Thank you Jeff, I will try now

 August 31, 2004, 23:48 Re: The k-epsilon model #6 girish Guest   Posts: n/a dear sir, i want to know details of K-epsilon model,if u sent me the details i will thankful to you yours faithfully girish

 September 1, 2004, 11:10 Re: The k-epsilon model #7 Luis Guest   Posts: n/a Hi Girish You can get detail information of the model in the CFX manual under Two equation turbulence model. Also, you can read An introduction to Computational Fluid Dynamics, The Finite Volume Method by H. K. Versteeg, 1995. Luis

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