# LES turbulence model

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 August 28, 2014, 06:39 LES turbulence model #1 Member   Join Date: Aug 2011 Posts: 83 Rep Power: 8 Hello, in OpenFOAM different LES turbulence models can be chosen. For example the "oneEqEddy", which is a -equation eddy-viscosity model. I just want to know how this model is working. Can anybody help me? It would be also very helpful to get literature, which describes this model. Thanks alot

 August 28, 2014, 09:39 src/turbulenceModels/compressible/LES/oneEqEddy/oneEqEddy.H #2 Senior Member     Armin Join Date: Feb 2011 Location: Helsinki, Finland Posts: 156 Rep Power: 12 Well the source code gives already some clues: Code: ```src/turbulenceModels/compressible/LES/oneEqEddy/oneEqEddy.H src/turbulenceModels/compressible/LES/oneEqEddy/oneEqEddy.C``` Also check out the wiki and this thread: http://www.cfd-online.com/Wiki/Kinet...id-scale_model http://www.cfd-online.com/Forums/ope...-openfoam.html

August 28, 2014, 09:46
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Join Date: Aug 2011
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Hello again,
I am sorry, I forget to mention I am looking at the incompressible turbulence model.

After reading the source code, my question changed a little:
In oneEqEddy.H the following equation for k is written:
Quote:
 d/dt(k) + div(U*k) - div(nuEff*grad(k)) = -B*L - ce*k^3/2/delta and B = 2/3*k*I - 2*nuSgs*dev(D) Beff = 2/3*k*I - 2*nuEff*dev(D) where D = symm(grad(U)); nuSgs = ck*sqrt(k)*delta nuEff = nuSgs + nu
Unfortunately I found no definition for L

If I look in the file oneEqEddy.C I found the following equation for k:
Quote:
 fvm::ddt(k_) + fvm::div(phi(), k_) - fvm::laplacian(DkEff(), k_) == G - fvm::Sp(ce_*sqrt(k_)/delta(), k_) with G = 2.0*nuSgs_*magSqr(symm(gradU))
As far as I understand G is a part of the term B*L.
If I am right, where is then the first part of B (2/3*k*I) in the k-equation?
Is this term necessary?

thanks a lot for your help

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