Hi !

I'm trying to model a three phase flow in Comsol multiphysics. So I used the "ternary phase field model" but I'm very skeptical about it since it couples the mobility and the capillarity (I looked at the original article but I'm not convinced at all one has to do it this way).

I mean that when the spreading constant $\Sigma_i$ is negative, the mobility starts having not physical values.

So my idea was to use 2 binary phase field models together and couple the equations. Unfortunately and as expected it is very difficult and I don't manage to make it converge.

Has anybody ever used the ternary mixture model ? What's your experience regarding the point I discussed ? Have you ever tried to couple 2 binary mixture models to model a ternary mixture model ?

I'm using the last version of Comsol.

Thank you in advance

Joseph