Turbulent timescale
Dear all,
I am currently facing the problem of determining the local turbulent timescale, and I want to implement a function which does not depend from the kind of turbulence model used (LES/RAS). Looking inside solvers which already implement it (i.e. reacting*Foam) I have discovered something like this volScalarField tk = Cmix*sqrt(turbulence->muEff()/rho/turbulence->epsilon()); which should indeed represent a quite general approach. However, I have the following questions: - why does the expression contain muEff() and not mut()? According to my knowledge muEff includes the molecular viscosity. Even if this latter may be negligible in cold, high-Reynolds flows, I am pretty sure that in combustion applications the two viscosity may locallybe comparable! - is there any other possible approach I may use to get this quantity from both LES and RAS model? Thanks in advance, Max |
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