
#1
Dec511, 11:00 AM

P: 1

Hi all,
I want to calculate the electrostatic potential for an twodimensional area with given Dirichlet boundary conditions (say, a square) with a charged ring in it (like a wedding ring, but inifinitely thin) with a given line charge density. I figured out that the problem should be solvable if I divided up the whole area into two areas: inside (solution phi_1(r)) and outside (solution phi_2(r)) the ring, connected with the boundary conditions phi_1=phi_2 dphi_1/dndphi_2/dn=\sigma/epsilon_0 d.../dn is the normal derivative, and sigma is the positiondependent line charge along the ring. If you want, you can also think about the physics behind this, but my real question is about the mathematical issue: Do you know any (free) FEM software that can implement those conditions? I read into NGsolve and ELMER until now, and I don't think they can do it (at least, in a reasonable amout of my time configuring it). Best Rafael 


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