The Artificial Boundary Method for a Nonlinear Interface Problem on Unbounded Domain

Abstract

In thispaper, we apply the artificial boundary method to solvea three- dimensional nonlinear interface problem on an unbounded domain. A spherical or ellipsoidal surface as the artificial boundary is introduced. The exact artificial boundary conditions are derived explicitly in terms of an infinite series and then the well-posedness of the coupled weak formulation in a bounded domain, which is equivalent to the original problem in the unbounded domain, is obtained. The error estimate depends on the mesh size, the term after truncating the infinite series and the location of the artificial boundary. Some numerical examples are presented to demonstrate the effectiveness and accuracy of this method. Keyword: Artificial boundary method, Dirichlet to Neumann mapping, Finite element method, Natural integral operator, Nonlinear interface problem.