- **OpenFOAM Running, Solving & CFD**
(*http://www.cfd-online.com/Forums/openfoam-solving/*)

- - **Favre averaged values**
(*http://www.cfd-online.com/Forums/openfoam-solving/60149-favre-averaged-values.html*)

I want to do RANS with variablI want to do RANS with variable density. The governing equations for my problem known but I was wondering how to treat the favre averaged values!
- Are the variables automatically favre averaged when using a compressible RANS-model? - When the solver computes i.e. k,epsilon ... are these the Favre averged values which I get back? As you can see I am a little bit confused with these averaging things. |

Yes, and yes.
The point of Yes, and yes.
The point of Favre averaging is that it is a mathematical trick designed to get us back to the same form of the equations. We _know_ how to solve the NSE in the form ddt(rho u) + div(rho u u) = ... When we average this equation /\ we get ddt(/rho u \) + .... Favre averaging allows us to split /rho u\ into separate variables, getting back to where we started again. So, yes; when using a compressible RANS model, the variables will be by definition assumed to be Favre averaged. Gavin |

Favre or RANS averaged equations are used in incompresible reacting flow ?I'm simulating incompresible reacting flow case where RSM is used as turbulence model. I have doubt about what fluent is actually solving for my case. Whether Favre-averaged NSE or RANS averaged NSE.
Can anybody help ? |

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