Let's consider a rectangular channel having a porous obstruction in between. I want to set up a case to simulate the changes in flow behaviour due to this obstruction using VOF (interFoam). What pressure and velocity boundary conditions should I consider on the interface of porous medium and fluid?
Are you using Darcy-Forchheimer approximation for modelling the porous region? Could you please elaborate the problem a bit more?
With what you have mentioned so far it's hard to imagine the need for any pressure or velocity boundary at the interface l.
For the pressure B.C, you can use zeroGradient boundary (of course you define pressure initially and suitable pressure BC at the inlet or better at the outlet of the flow). On the other hand velocity B.C is very important in your case look into noSlip, Slip, zeroGradient and partialSlip boundaries.
You should pay attention to near-wall region especially if you have a turbulent flow.
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