keps in finite elements
Hello, I'm looking for references on the implantation strategies of turbulence model (keps) in finite elements. Thanks for help ! Ben

welcome: keps
Where do you start from ?

Re: keps in finite elements
the code NSC2KE is a 2d NS code using ke w/ finite elements. you can find a link to the code and documentation at http://capella.Colorado.EDU/~laney/softaero.htm

Re: keps in finite elements

Re: welcome: keps
Hi, I know the finite elements : I work with a code for viscous steady and nonsteady flows I know about keps, and I want to introduce it in my code. I'm looking for programation strategies, algorithm, practical knowhow Thanks for help, Ben

Re: welcome: keps
Dear Ben,
I managed to program a 1D resolution (no simple algorithm) of the incompressible keps with finite differences for linearized custom equations with additionals sources. I was rather confident: I had yet solved analytical first order turbulence model (and spent weeks to relax it). However, keps convergence appeared as a more relevant tricky business: my code still not converges. So, I wonder who can help you: programation strategies have been argued to depend on many conditions to me, herein. I could see various tricks within open sources codes, but these could not help me enough. For finite elements, if read a preprint (Lee and Leone, 1991: "Numerical Modeling of Turbulent Dispersion Around Structures Using a Particlein Cell Method", available as a pdf from the Lawrence Livermore National Lab.) Paper refered to some 'clipping' method (used by the FIDAP code ? ), whose purpose is to avoid negative values for k and epsilon, and not too large nu_t values, but this is rather poorly documented, as are the various others tricks (e.g.: nu_t = C_mu*k^2/(tiny+abs(eps)), instead of: nu_t = C_mu*k^2/eps) involved within CFD solvers. I implemented clipping, as well as various unsuccessfulls relaxations schemes... I planned to summarize tricks for keps, some day, so as more and more people can develop open source codes, within buying some more book. If you plan to go this way, please, do not embed pre and post processing, it would be easier to understand. You may find links to postprocessing software within the forum. For pre, post, as well as 'proto' processing purposes, high level interpreted languages toolboxes (e.g.: Scilab may incorporate finite elements utilities) may help, at computing time cost, however. For research purposes this shouldn't hurt (much). Own opinion(heard this as open source developpers policy): consider starting from an existing software provided by some of the links below. This way, you may spare pain reusing a maximum of availables (if suited enough) parts. Hope some Doctor will let us know more 
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