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-   -   UDF Multicomponent Diffusivity with Knudsen term (http://www.cfd-online.com/Forums/fluent/48978-udf-multicomponent-diffusivity-knudsen-term.html)

Emmanuel Resch August 8, 2008 21:01

UDF Multicomponent Diffusivity with Knudsen term
 
Hi,

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,

Emmanuel


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