Discussion Forum

Hello,

I'm very new to COMSOL, and I'm creating what I feel like should be a fairly simple model in COMSOL 6.1 so I'm not sure what I'm doing incorrectly. I want to simulate a hemispherical copper shell, place some RF source a distance away, hit the shell with the source, and measure the temperature response. Given that the skin depth of the shell is much less than the characteristic length, the impedance boundary condition should be applicable and I don't expect much (if any) temperature increase in the shell.

I have created the copper shell, a rectangular port, and a spherical boundary around the shell and port that is filled with air. I'm considering 1 kW power and a 2.45 GHz source initially, just for the proof-of-principle part of the model (an image of the geometry and defined port are attached).

My question is in how to define the boundary conditions and measure the temperature at the center of the hemispherical shell. I tried defining the shell with the impedance boundary condition, but it says not applicable.

Is there a different boundary condition I should be using? Or should I not be defining the material of the hemispherical shell as copper, and solely defining it with the impedance boundary condition?

Finally, I've tried defining a 3D Cut Point at (0,0,0) (which is the center of the hemispherical shell), but the results give no temperature. Not a constant temperature, the graph is just blank. I've attached my model with the mesh and solution cleared and would appreciate any help that can be provided.