Multiscale Petrov-Galerkin method for high-frequency heterogeneous Helmholtz equations

Brown, Donald and Gallistl, Dietmar and Peterseim, Daniel (2017) Multiscale Petrov-Galerkin method for high-frequency heterogeneous Helmholtz equations. Lecture Notes in Computational Science and Engineering, 115 . pp. 85-115. ISSN 1439-7358

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Abstract

This paper presents a multiscale Petrov-Galerkin finite element method for time-harmonic acoustic scattering problems with heterogeneous coefficients in the high-frequency regime. We show that the method is pollution free also in the case of heterogeneous media provided that the stability bound of the continuous problem grows at most polynomially with the wave number k. By generalizing classical estimates of Melenk (Ph.D. Thesis 1995) and Hetmaniuk (Commun. Math. Sci. 5, 2007) for homogeneous medium, we show that this assumption of polynomially wave number growth holds true for a particular class of smooth heterogeneous material coefficients. Further, we present numerical examples to verify our stability estimates and implement an example in the wider class of discontinuous coefficients to show computational applicability beyond our limited class of coefficients.

Item Type: Article
Additional Information: The final publication is available at Springer via http://dx.doi.org/10.1007/978-3-319-51954-8
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Mathematical Sciences
Identification Number: 10.1007/978-3-319-51954-8_6
Depositing User: Brown, Donald
Date Deposited: 08 May 2017 11:07
Last Modified: 08 May 2017 11:57
URI: http://eprints.nottingham.ac.uk/id/eprint/42391

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