Modeling heat transfer through porous media
 

Hello
I want to use ANSYS Fluent/AIM (18.0) to essentially replicate this video:
https://www.youtube.com/watch?v=lJ3aNj9Y9j0

So fluid flow through an inlet, through a fluid zone, through a porous media, then out an outlet.

I'm not seeing how to set up any kind of porosity in AIM, however. What do you have to do to assign porosity to a solid in AIM?
Is it under the "Material Assignments" somewhere?