[awacs]

Dear Foamers,

I am trying to create a new solver based on interFoam to simulate polymer melt flows(two phase flow with an free interface). I want to use the following boundary condition in my simulation:
The no-slip boundary condition is applied on the polymer melt only. The air is free to leave the cavity as pushed out by the advancing melt. This type of boundary condition is dynamic and changes as the polymer melt advances in the cavity. It must satify the following conditions on the boundary:
u=0 when gamma>=0.5 (filled);
σ(u)·n－p·n=0 when gamma<0.5 (empty);
where, u is the velocity, σ is the deviatoric stress tensor, p is the pressure and n is the outside normal direction.


I am a green hand in this field, could you guys give me tips how could I proceed it.

Thanks in advance.


Jitao Liu