[Kepojeyathas]

Hi everyone.
I'm beginner with Ansys fluent and I've to do a 3D solar load simulation (DO radiation e solar ray tracing) on a building. The buildings materials are: concrete for roof and walls, the glass and the ground material. Should I have to do different cell zones for each material? Can I set only the air as a cell zone and put the wall, roof, glass as a Boundary condition?

In the attachment 1 the green one is the fluid domain; the violet one the ground;
In the attachment 2 the green one is the concrete material, in violet the ground and in blue the glass.

I hope someone can help me, thanks!

[Emmanuel_Sansusthy_T]

If you are only interested in studying the fluid (air) inside the building, you can assign cell zone just to that volume.
About the walls, windows, and others, you can keep them as coupled walls (shells or surfaces) to enable heat transfer. Additionally, if you want to take into account the heat conduction through them, enable "shell conduction" in the wall boundary conditions. There, you specify the thickness of the walls or windows and the material, which will supply the thermal conductivity. You can even make multi-layer walls with this option.