CFD Online Discussion Forums

CFD Online Discussion Forums (
-   FLUENT (
-   -   UDF Multicomponent Diffusivity with Knudsen term (

Emmanuel Resch August 8, 2008 21:01

UDF Multicomponent Diffusivity with Knudsen term

I'm trying to model the diffusivity in a porous region. Using the parallel pore model, the diffusivity can be the harmonic average of the effective multicomponent diffusivty (i.e. Stefan Maxwell - mc) and the Knudsen diffusivity(kn), such that 1/Deff = (1/Dkn + 1/Dsm)^(-1).

I'm just wondering if people could suggest a way to use the multicomponent diffusivity model in Fluent to calculate Dsm, but then use this diffusivity to calculate a Deff as above that will be used in governing transport equations...

Thanks a lot,


All times are GMT -4. The time now is 00:14.