Thanks for the info, pblarsen. Your are right, it's the electrical symmetry that concerns me. For my case (as shown in the diagram). I divided my parallel plate setup into 36, 10degree sections and I would like to define a rotational symmetry. However, I am not sure how to do that accurately. My case is such that I have not been using a region to calculate capacitance till now, assuming it would include all the fringing effects from any direction in its calculation. Specifically, I have the following concerns:

  • Now, when I take a 10 degree section (without any boundary conditions) the capacitance for that section is not exactly 1/36th of the total, but very close. As a comparison, the cap of the full setup is 112.04pF, whereas for each section it calculates to be 3.0494pF. If this difference is considered negligible and common, do I even need to consider any boundary conditions for my case?

  • Secondly, when I do consider Master/Slave boundary condition (firstly, I have to define three sets of Master/Slave - for the two plates and the dielectric, since I have no region), the result is different but again not exactly 1/36th of the total.

I am just trying to figure out how to proceed with this. I can provide my model If someone is willing to test this out.

Your help is much appreciated. Thanks