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Based on the perfectly matched layer (PML) technique, this paper develops ahigh-accuracy boundary integral equation (BIE) solver for acoustic scatteringproblems 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 deriveBIEs on local defects only in terms of using PML-transformed free-space Green'sfunction, and the four standard integral operators: single-layer, double-layer,transpose of double-layer, and hyper-singular boundary integral operators. Thehyper-singular integral operator is transformed into a combination ofweakly-singular integral operators and tangential derivatives. We develop ahigh-order Chebyshev-based rectangular-polar singular-integration solver todiscretize all weakly-singular integrals. Numerical experiments for both two-and three-dimensional problems are carried out to demonstrate the accuracy andefficiency of the proposed solver.

A highly accurate perfectly-matched-layer boundary integral equation solver for acoustic layered-medium problems