Re: How can I define a porous wall in comsol?

Many thanks for you patient help Pieter !
Actually right now there is no computational domain outside the membrane, the permeate side of the membrane is not considered yet, but will be taken into consideration in the future after this problem is solved.

Also I'm not sure would there be any different whether the permeated side is considered in computational domain or not...

The computational domain is a two phase fluid domain. The continous phase is water and dispersed phase is solid particles. Only water is allow to pass through the membrane

Thanks again for your generous help ^_^