A Nitsche Finite Element Approach for Elliptic Problems with Discontinuous Dirichlet Boundary Conditions
It provides a convergent numerical method for elliptic problems with discontinuous boundary conditions, which is a known challenge in computational mathematics.
The paper develops a Nitsche finite element method for linear diffusion-reaction problems with discontinuous Dirichlet boundary conditions, achieving second-order convergence in mesh size by combining singular functions with a regularized Nitsche approximation.
We present a numerical approximation method for linear diffusion-reaction problems with possibly discontinuous Dirichlet boundary conditions. The solution of such problems can be represented as a linear combination of explicitly known singular functions as well as of an $H^2$-regular part. The latter part is expressed in terms of an elliptic problem with regularized Dirichlet boundary conditions, and can be approximated by means of a Nitsche finite element approach. The discrete solution of the original problem is then defined by adding the singular part of the exact solution to the Nitsche approximation. In this way, the discrete solution can be shown to converge of second order with respect to the mesh size.