Yes, sorry that i didnt tell you. It is air and the resin. I did a lot of research but couldnt find out how they implemented it in Ansys Fluent. The attached Paper is how i want to do it. My only Problem is to assign velocity to the porous domain. Like i said: With a momentum source term it already worked but this is not the way i want to simulate it. https://www.mdpi.com/2073-4360/14/4/666
Thank you rob, for your time.