[Cornelia]

I am trying to set up a model with several hundred of porous membranes of size 1.3m² each. Their thickness is 0.003m and their Darcy's coefficient is 10e+10 m^(-2) - quite high!

My first idea was to use a porousBafflePressure BC inside the simpleFoam solver. But I found out that this BC is really unstable: it is already quite hard to get converged a simple test case, and it seems to be impossible for my real model.

So I had a deeper look into porousSimpleFoam solver. With a test case I found out that I have to use a very fine mesh inside my porous media and also next to my porous media in order to predict the pressure loss through the membrane accurately. If I use only 1-2 cell layers inside my membranes, the pressure drop is computed much too low. For my real model I would get a crazy amount of cells...


So I wonder if somebody can share some experiences or ideas on how I can set up my model efficiently:
- How do you usually model your porous membranes? As porous baffle or as porous media?
- Is there a good way to converge the porousBafflePressure BC?
- How fine is your mesh?
- etc.