A HIGHLY ACCURATE PERFECTLY-MATCHED-LAYER BOUNDARY INTEGRAL EQUATION SOLVER FOR ACOUSTIC LAYERED-MEDIUM PROBLEMS.

Based on the perfectly matched layer (PML) technique, this paper develops a highly accurate boundary integral equation (BIE) solver for acoustic scattering problems in locally defected layered media in both two and three dimensions. The original scattering problem is truncated onto a bounded domain by the PML. Assuming the vanishing of the scattered field on the PML boundary, we derive BIEs on local defects only in terms of using PML-transformed free-space Green's function, and the four standard integral operators: single-layer, double-layer, transpose of double-layer, and hyper-singular boundary integral operators. The hyper-singular integral operator is transformed into a combination of weakly-singular integral operators and tangential derivatives. We develop a highorder Chebyshev-based rectangular-polar singular-integration solver to discretize all weakly singular integrals. Numerical experiments for both two- and three-dimensional problems are carried out to demonstrate the accuracy and efficiency of the proposed solver. [ABSTRACT FROM AUTHOR]