Quasi-static Maxwell's equations with a dissipative non-linear boundary condition: Full discretization

Abstract

We study a time dependent eddy current equation for the magnetic field H accompanied with a nonlinear boundary condition, which is a generalization of the classical Silver–Müller condition for a non-perfect conductor. More exactly, the relation between the normal components of electric (E) and magnetic (H) fields obeys the following power law (linearized for small and large values) ν×E=ν×(|H×ν|α−1H×ν) for some α∈(0,1]. We design a linear fully discrete approximation scheme to solve this nonlinear problem. The convergence of the approximations to a weak solution is proved, error estimates describing the dependence of the error on discretization parameters are derived as well. The efficiency of the proposed method is supported by numerical experiments.