[mizzou]

Dear friends,

I am so overwhelmed in my problem and I cannot figure out after spending too much time. I would more than appreciate if anyone could please provide me any comment how to solve that. I used to apply the solver interFoam to simulate air-water two-phase flow inside a 2D pipe (which is a simple rectangular channel). Now, I want to add a porous zone inside that old domain. In other words, I should have a secondary rectangular inside the bigger one while the walls of the inner one should be permeable. I have attached the schematic of what I am saying hereby. I really don't know how to create my second domain inside the main one.
Any help is highly appreciated.

Thank you,