How to calculate the flux?
 

How to calculate the flux of a spices in a specified direction? I mean which is just what the fluent solver does.

Re: How to calculate the flux?
 

Greg, a fellow poster, helped me out with this one a while ago

http://www.cfd-online.com/Forum/flue...cgi?read=14363

It was for a UDS flux, but I reckon the same could be applied to a F_YI

I wanna calculate the D*grad(Yi)*ds
 

Maybe I make something not clear. My question is related to his but not totally: For this term: -grad(D grad(Yi)) I wanna calculate the

D*grad(Yi)*ds Which is the diffusion flux through a face of a cell. I designed a method which gives me 2% difference with the result of fluent solver. I wanna get the exact fluent solver expression for this term. Any help will be highly appreciated. Thanks. Yun