New point-weighting 17-point and 25-point finite difference schemes for the 2D Helmholtz equation with PML are fourth-order consistent and are tuned to reduce numerical dispersion.
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A generalized optimal fourth-order finite difference scheme for a 2D Helmholtz equation with the perfectly matched layer boundary condition
New point-weighting 17-point and 25-point finite difference schemes for the 2D Helmholtz equation with PML are fourth-order consistent and are tuned to reduce numerical dispersion.