Porous Monolith in a pipe

Dear All,

i'm studying heat transfer in a pipe where there is a SiC monolith surrounded by an insulating mat (see screenshot).

Up to now I have studied the system considering the monolith as pure solid using for my model only the Conjugate Heat Transfer physics.

Do I have to change physics to consider the monolith as porous?
If yes how have I to set the domain in the new physics?

Thank you in advance for your reply!
Have a nice day.