Accurate finite difference methods for time-harmonic wave propagation
Journal of Computational Physics
Discrete Dispersion Relation for hp-Version Finite Element Approximation at High Wave Number
SIAM Journal on Numerical Analysis
A perfectly matched layer for the Helmholtz equation in a semi-infinite strip
Journal of Computational Physics
Component-Averaged Row Projections: A Robust, Block-Parallel Scheme for Sparse Linear Systems
SIAM Journal on Scientific Computing
Compact finite difference schemes of sixth order for the Helmholtz equation
Journal of Computational and Applied Mathematics
A Compact Fourth Order Scheme for the Helmholtz Equation in Polar Coordinates
Journal of Scientific Computing
The Method of Difference Potentials for the Helmholtz Equation Using Compact High Order Schemes
Journal of Scientific Computing
Journal of Computational Physics
Hi-index | 31.45 |
Several studies have presented compact fourth order accurate finite difference approximation for the Helmholtz equation in two or three dimensions. Several of these formulae allow for the wave number k to be variable. Other papers have extended this further to include variable coefficients within the Laplacian which models non-homogeneous materials in electromagnetism. Later papers considered more accurate compact sixth order methods but these were restricted to constant k. In this paper we extend these compact sixth order schemes to variable k in both two and three dimensions. Results on 2D and 3D problems with known analytic solutions verify the sixth order accuracy. We demonstrate that for large wave numbers, the second order scheme cannot produce comparable results with reasonable grid sizes.