I am doing a CFD simulation where at one point in the apparatus a filter exists. My working medium is a solution/mixture of two substances. The job of the filter is to let only one substance to go through it and withhold the other from passing. In the real application this is happens because the molecules of the one substance cannot go through the porous medium due to the molecules being larger than the pores.
Do you have any ideas about how I could model that kind of a filter, as I am quite stuck with this.
Thanks a lot for any help!