Discussion Forum

Hi everyone,

I mentioned this in an earlier post. I believe I have an inconsistency with the software (COMSOL Multiphysics Base Package). This may or may not be intended. When picking between the Electrostatics and Electric Currents Interfaces, I believe that the the basic functionality should be the same.

I have attached two different models of 3 copper "terminal" like objects in the middle of a relative insulator. I want to see the electric field and potential field mapped onto the geometry. One model uses the Electrostatics Interface and the other uses the Electric Currents Interface. Each model has a potential on the left terminal, ground on the right terminal, and nothing assigned to the middle terminal. Theoretically, the voltage should vary linearly from the potential to the ground with a little glitch in the linearity over the middle terminal. This is what the file "Electrostatics_ForumQuestion.png" file shows, which is the correct one. The other picture file "ElectricCurrents_ForumQuestion.png" shows an incorrect interpretation of the model (a non-linear change of the voltage with respect to the distance between the potential and grounded terminals). I have also included the corresponding Comsol model files for each one if you would like to see more.

Maybe I am missing something theoretically here. If these models do vary for some mathematical/physical reason (which I am obviously completely blind to :) ), could someone please explain to me why?

Thanks in advance for your time!
John