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Calculation of Epsilon in LES model

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Old   January 15, 2013, 22:05
Default Calculation of Epsilon in LES model
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Yuri Almeida
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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
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Old   January 17, 2013, 11:55
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Gregor Olenik
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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();
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Old   January 18, 2013, 07:43
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Yuri Almeida
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Hi Gregor,

Now I got it!

Thank you very much!
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