Combined boundary integral equations for acoustic scattering-resonance problems

Olaf Steinbach, Gerhard Unger*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this paper, boundary integral formulations for a time-harmonic acoustic scattering-resonance problem are analyzed. The eigenvalues of eigenvalue problems resulting from boundary integral formulations for scattering-resonance problems split in general into two parts. One part consists of scattering-resonances, and the other one corresponds to eigenvalues of some Laplacian eigenvalue problem for the interior of the scatterer. The proposed combined boundary integral formulations enable a better separation of the unwanted spectrum from the scattering-resonances, which allows in practical computations a reliable and simple identification of the scattering-resonances in particular for non-convex domains. The convergence of conforming Galerkin boundary element approximations for the combined boundary integral formulations of the resonance problem is shown in canonical trace spaces. Numerical experiments confirm the theoretical results
Original languageEnglish
Pages (from-to)1516-1530
JournalMathematical Methods in the Applied Sciences
Issue number5
Publication statusPublished - 2017


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