Selection of UPML parameters in DGTD calculation

Abstract

Outgoing waves can be strongly absorbed in Perfectly Matched Layer (PML), but its absorption effect strongly depends on the selection of the medium parameters in the PML layer. In this paper, the optimization problem of UPML absorption boundary of Discontinuous Galerkin Time Domain (DGTD) method based on 0.5 order and 1.5 order basis functions are studied. The effects of basis function, discrete scale, UPML layer thickness and medium parameters on the absorption effect are discussed in detail. Based on the simulation results, the optimized parameter selection scheme is given to simplify the choice of UPML.