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Error estimates for the Ultra Weak Variational Formulation of theHelmholtz equation

Published online by Cambridge University Press:  12 August 2008

Annalisa Buffa  and
Peter Monk
Annalisa Buffa
Affiliation:
Istituto di Matematica Applicata e Tecnologie Informatiche, via Ferrata 1, 27100 Pavia, Italy. annalisa@imati.cnr.it
Peter Monk
Affiliation:
Department of Mathematical Sciences, University of Delaware, Newark, DE 19716, USA. monk@math.udel.edu
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Abstract

The Ultra Weak Variational Formulation (UWVF) of the Helmholtz equationprovides a variational framework suitable for discretization using plane wave solutionsof an appropriate adjoint equation. Currently convergence of the method is only proved on the boundary of the domain. However substantial computational evidence exists showing that the method also converges throughout the domain of the Helmholtz equation. In this paper we exploit the fact that the UWVF is essentially an upwind discontinuous Galerkin method to prove convergence of the solution in the special case where there is no absorbing medium present. We also provide some other estimates in the case when absorption is present, and give some simple numerical results to test the estimates. We expect that similar techniques can be used to prove error estimates for the UWVF applied to Maxwell's equations and elasticity.

Keywords

Helmholtz equationUWVFplane waveserror estimate.
Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 42 , Issue 6 , November 2008 , pp. 925 - 940
Copyright
© EDP Sciences, SMAI, 2008

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