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Error estimates for Galerkin reduced-order models of thesemi-discrete wave equation

Published online by Cambridge University Press:  18 December 2013

D. Amsallem
Affiliation:
Department of Aeronautics and Astronautics, Stanford University, Stanford, CA 94305, USA.. amsallem@stanford.edu
U. Hetmaniuk
Affiliation:
Department of Applied Maths, University of Washington, Box 353925, Seattle, WA 98195-3925, USA.; hetmaniu@uw.edu

Abstract

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Galerkin reduced-order models for the semi-discrete wave equation, that preserve thesecond-order structure, are studied. Error bounds for the full state variables are derivedin the continuous setting (when the whole trajectory is known) and in the discrete settingwhen the Newmark average-acceleration scheme is used on the second-order semi-discreteequation. When the approximating subspace is constructed using the proper orthogonaldecomposition, the error estimates are proportional to the sums of the neglected singularvalues. Numerical experiments illustrate the theoretical results.

Information

Type
Research Article
Copyright
© EDP Sciences, SMAI 2013