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,
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