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How can I define a porous wall in comsol?

Hi everyone, I'm now modeling a membrane filtration process.
it a very simple 2D rectangle domain,
one boudary is inlet, one boudary is outlet, one is no slip wall, the rest is a wall with porous structure(considered as membrane).
So the problem is how can I treat the wall as a porous wall, because it is very thin and we don't have to built its real porous structure
Many thanks!

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