High-order discretization of a stable time-domain integral equation for 3D acoustic scattering

Alex Barnett, Leslie Greengard, Thomas Hagstrom

Research output: Contribution to journalArticlepeer-review

Abstract

We develop a high-order, explicit method for acoustic scattering in three space dimensions based on a combined-field time-domain integral equation. The spatial discretization, of Nyström type, uses Gaussian quadrature on panels combined with a special treatment of the weakly singular kernels arising in near-neighbor interactions. In time, a new class of convolution splines is used in a predictor-corrector algorithm. Experiments on a torus and a perturbed torus are used to explore the stability and accuracy of the proposed scheme. This involved around one thousand solver runs, at up to 8th order and up to around 20,000 spatial unknowns, demonstrating 5–9 digits of accuracy. In addition we show that parameters in the combined field formulation, chosen on the basis of analysis for the sphere and other convex scatterers, work well in these cases.

Original languageEnglish (US)
Article number109047
JournalJournal of Computational Physics
Volume402
DOIs
StatePublished - Feb 1 2020

Keywords

  • Acoustic scattering
  • High-order methods
  • Time-domain integral equations

ASJC Scopus subject areas

  • Numerical Analysis
  • Modeling and Simulation
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)
  • Computer Science Applications
  • Computational Mathematics
  • Applied Mathematics

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