[Bulrush]

Dear everyone:
I known Soret effect is the contribution of temperature gradient to mass flux when there are multiple fluids in the flow. But so far as I know, in the numerical simulation of Compressible NS equations with multiple species (and even chemically reacting), no Soret effect is considered (and also for Dufour effect), such as that in the paper Fedkiw, R.P. (J. Comput. Phys., 1997).

Anyone could tell me the reason? Thank you.