Abstract
We consider high-frequency multiple-scattering problems in the exterior of two-dimensional smooth scatterers consisting of finitely many compact, disjoint, and strictly convex obstacles. To deal with this problem, we propose Galerkin boundary element methods, namely the frequency-adapted Galerkin boundary element methods and Galerkin boundary element methods generated using frequency-dependent changes of variables. For both of these new algorithms, in connection with each multiple-scattering iterate, we show that the number of degrees of freedom needs to increase as \(\mathcal {O}(k^{\epsilon })\) (for any \(\epsilon >0\)) with increasing wavenumber k to attain frequency-independent error tolerances. We support our theoretical developments by a variety of numerical implementations.






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F. Ecevit’s work was supported by The Scientific and Technological Research Council of Turkey through grant number TÜBİTAK-1001-117F056. A. Anand gratefully acknowledges support from IITK-ISRO Space Technology Cell through contract No. STC/MATH/2014100. Y. Boubendir’s work was supported by the NSF through Grant DMS-1720014.
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Ecevit, F., Anand, A. & Boubendir, Y. Galerkin Boundary Element Methods for High-Frequency Multiple-Scattering Problems. J Sci Comput 83, 1 (2020). https://doi.org/10.1007/s10915-020-01189-x
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DOI: https://doi.org/10.1007/s10915-020-01189-x