Hi Zahreddine:

In COMSOL manual, there are some application scenarios on two phase flow through porous media. I think you could start to follow the example from the manual and get familar with using COMSOL to solve two phase flow problem. Then you could change the geometry, physics, initial and boundary conditions for your own problem.

Regards,

Dong

Article An improved relative permeability model for coal reservoirs

Hi Dong,

Thanks a lot for the reply and the document. I'm testing some models but the problem is that for some Comsol modules the theory that goes behind is not well developed in the manual.

Thanks again

The governing equations are converted to the equations of pw (wetting phase pressure) and pnw (nonwetting phase pressure). You can treat the two equations as the matrix of pw and pnw. Capillary pressure is the difference between pw and pnw.

Under Comsol, normally via the Two Phase Darcy law module we can simulate immiscible fluids flow in porous media, in that way we need to define the capillary pressure i.e. its variation with saturation. Well, the initial capillary pressure can be guessed through the contact angle and the surface tension coefficient but to describe pc=f(s), a model is required (ven Genuchten, Brooks Corey...), the problem is that I'm not finding a rigorous definition of these models parameters (IvG, mvG, lambda) in a way to adjust them according to the treated problem.

I don't know if my approach is correct or I'm missing something.