Discussion Forum

Hi everyone, I would like to save some processing and memory requirements by utilizing the symmetry and antisymmetry in my models (Electrostatics and Electric Currents physical interfaces). I can impose the symmetry by using "Electric Insulation" boundary condition, but I do not know how (or whether it is even possible) to use the antisymmetry here. Although the problem I am solving is slightly more complicated, its essence can be demonstrated by the following simple example.

Consider a geometry containing just of a unit sphere. On the surface of the sphere we apply a potential boundary conditions of the form , where and are the spherical coordinates. When plotted, it looks like this (potential_boundary_condition.png):

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Now, I want to solve for the electric potential inside the whole sphere. Because of the obvious (anti)symmetry, it is tempting to split the simulation domain and consider only one quadrant of the whole geometry (keep in mind that I would like to use these principles in solving more complex but still (anti)symmetrical models). Is it possible to impose an antisymmetry condition to the highlighted faces (antisymmetry_faces.png)?

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I found out that in some physics interfaces, this is possible (e.g., the Perfect Magnetic Conductor Boundary Condition). But is it possible in electric currents or electrostatics interface?

Thanks for any advice. Tomas

I am using Comsol v5.1.