How to Couple Free and Porous Media Flow with Heat Transfer In Solids

Hi Everyone,

I am new to COMSOL and I am trying to simulate a solar panel cooling system. I am trying to simulate in 2D the heat transfer between a thin rectangular layer (the photovoltaic cell), another thin rectangular layer (thermal paste), and finally a porous layer through which water is flowing. Ultimately, I want specify a heat flux and initial temperature on the top layer (PV cell) and obtain the heat removed and temperature change achieved by using the porous media as a heat sink. I can couple the heat transfer between the 2 solid layers easily, however, I am having trouble simulating the heat transfer between all three layers (i.e. PV cell, thermal paste, and porous media).

Currently, I am using the following physics packages:

"Free and Porous Media Flow" - Models water flow through porous media
"Heat Transfer in Porous Media" - Models heat transfer in porous media layer
"Heat Transfer in Solids" - Models heat transfer in top two layers

My problem is that I can't get the top layers to "talk to" the porous media layer.

Any help would be greatly appreciated.

Thank you,
Brad