Change the Mass flux formulation in Star ccm
 

Hello,

I am modelling the gas diffusion in tiny channels, so there is a problem of channel wall effect, which need other diffusioin law to calculate the mass flux instead of Fick's law or molecule binary diffusion in Star ccm.

I'd like to modify the mass flux formulation in Star ccm so that the new obtained flux can be used to iterate with other governing equations.

Does anyone know how to achieve this ? Much appreciated !