Why can I assign solid properties to porous media

I am trying to simulate the heat transfer of fluid of through the porous-media inside a cylinder. This porous media is steel and acts as heat source too. But the problem I am facing is that fluent considers the porous media as fluid, why is it so? Why I am not able to assign solid properties to porous media? What is the concept behind this? Also can you all please suggest me solution to this problem?

Hi!

Just to double check: is this project in SimScale, or in a different platform?

Make sure to post a project link if the project is in SimScale.

Cheers