Perfectly Matched Layers for nonlocal Helmholtz equations Part II: higher dimensions

Perfectly matched layers (PMLs) are formulated and numerically applied to nonlocal Helmholtz equations in one and two dimensions. In one dimension, we give the PML modifications for the nonlocal Helmholtz equation with general kernels and show its effectiveness theoretically in some sense. In two dimensions, we give the PML modifications in both Cartesian coordinates and polar coordinates. Based on the PML modifications, nonlocal Helmholtz equations are truncated in one and two dimensional spaces, and asymptotic compatibility schemes are introduced to solve the resulting truncated problems. Finally, numerical examples are provided to study the "numerical reflections" by PMLs and verify the effectiveness and validation of our nonlocal PML strategy.

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