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-   -   Calculation of Epsilon in LES model (http://www.cfd-online.com/Forums/openfoam/111806-calculation-epsilon-les-model.html)

Yuri Almeida January 15, 2013 23:05

Calculation of Epsilon in LES model
 
Dears,

I'm performing flame simulations using the fireFoam solver. The default set for combustion is the eddy dissipation model, which furnishes the equation below for the source term in the species transport eqn:

wFuelNorm_ = C_*rho_*turbulence_.epsilon()
/max(turbulence_.k(),dimensionedScalar("SMALL",dimV elocity*dimVelocity,SMALL))
*min(YFuel , YO2/s.value());

However, the turbulence model utilized is LES OneEqEddy, which does not directly calculate the epsilon. So, where the epsilon calculation is performed? What expression is used for it?

Thanks in advance,

Yuri

gregor January 17, 2013 12:55

Hi Yuri,

the oneEqEddy model is derived from the GenEddyVisc model. In GenEddyVisc.H you find that epsilon is computed as
Code:

ce_*k()*sqrt(k())/delta();

Yuri Almeida January 18, 2013 08:43

Hi Gregor,

Now I got it!

Thank you very much!


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