comsol multiphysics

Hello, everyone! I just started using comsol 5.5 and I was assigned this problem to solve. I have a soil, which is invested by a cylindrical radiation and perpendicular to the soil itself. I want to put a point source on the ground. this source and so also the soil, are in contact with the air...

Bye to all, Is there someone using comsol? in particular the cfd module for fluid dynamic analysis? Thank you very much