Nested Volume-Surface Integral Equations for Acoustics

Abstract

The simulation of high-frequency acoustic wave propagation in unbounded domains with local heterogeneous materials and high-contrast interfaces poses significant challenges to numerical methods. The volume-surface integral equation (VSIE) method is an attractive approach as it automatically satisfies the radiation condition at infinity via Green's functions, handles heterogeneous materials via Newton potentials, and models scattering at high-contrast interfaces via surface integral operators. However, its effectiveness in practical simulations has been limited by high computational costs, sensitivity to sharp interfaces, and insufficient computational verification. This study extends the applicability of VSIE by deriving integral formulations for nested heterogeneous materials with parameter jumps at interfaces. We also develop extensive benchmarks against coupled finite-element and boundary-element methods to verify the VSIE's accuracy and mesh convergence. The various benchmarks using open-source software demonstrate the effectiveness of VSIE for large-scale acoustic simulations.

Disclosure

“acoustic fields across challenging scenarios. Acknowledgments Software and data availability The Python code to reproduce the numerical results is available on GitHub (github.com/daniloaballayf/BenchmarkingVSIEAcoustics). Declaration on generative AI During the preparation of this work, the authors used Google Gemini to improve the manuscript’s language and readability. The authors reviewed and edited the content as needed and take full responsibility for the article’s content.”

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4

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2026-08-24T00:34:12.480Z

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