Abstract:The perfectly matched layer-based boundary integral equation (PML-BIE) method (Lu et al., \emph{SIAM J. Appl. Math.} 78 (2018)) has become an effective tool for wave scattering problems in unbounded domains. Despite its successful applications, a rigorous convergence theory has remained incomplete in many physically relevant settings. In this paper, we present a general framework for establishing convergence of PML-BIE methods, using acoustic scattering in an impedance half-space as the first illustrative example. The framework separates the analysis into three components: convergence of the PML truncated partial differential equation, equivalence between the PML problem and an exact PML-BIE, and convergence of a computable PML-BIE obtained by replacing the exact kernel with a stretched free-space kernel. For the impedance half-space problem, we prove convergence of both the exact and computable PML-BIE formulations. The final error bound decays exponentially as the PML absorption power increases. The resulting theory provides a rigorous foundation for the PML-BIE method and gives a reference model for more general scattering problems in layered and inhomogeneous media.
From: Wangtao Lu [view email]
[v1]
Sun, 14 Jun 2026 16:04:42 UTC (29 KB)
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