Plane wave discontinuous Galerkin methods: Analysis of the h-version

Claude J. Gittelson; Ralf Hiptmair; Ilaria Perugia

ESAIM: Mathematical Modelling and Numerical Analysis (2009)

  • Volume: 43, Issue: 2, page 297-331
  • ISSN: 0764-583X

Abstract

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We are concerned with a finite element approximation for time-harmonic wave propagation governed by the Helmholtz equation. The usually oscillatory behavior of solutions, along with numerical dispersion, render standard finite element methods grossly inefficient already in medium-frequency regimes. As an alternative, methods that incorporate information about the solution in the form of plane waves have been proposed. We focus on a class of Trefftz-type discontinuous Galerkin methods that employs trial and test spaces spanned by local plane waves. In this paper we give a priori convergence estimates for the h-version of these plane wave discontinuous Galerkin methods in two dimensions. To that end, we develop new inverse and approximation estimates for plane waves and use these in the context of duality techniques. Asymptotic optimality of the method in a mesh dependent norm can be established. However, the estimates require a minimal resolution of the mesh beyond what it takes to resolve the wavelength. We give numerical evidence that this requirement cannot be dispensed with. It reflects the presence of numerical dispersion.

How to cite

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Gittelson, Claude J., Hiptmair, Ralf, and Perugia, Ilaria. "Plane wave discontinuous Galerkin methods: Analysis of the h-version." ESAIM: Mathematical Modelling and Numerical Analysis 43.2 (2009): 297-331. <http://eudml.org/doc/250619>.

@article{Gittelson2009,
abstract = { We are concerned with a finite element approximation for time-harmonic wave propagation governed by the Helmholtz equation. The usually oscillatory behavior of solutions, along with numerical dispersion, render standard finite element methods grossly inefficient already in medium-frequency regimes. As an alternative, methods that incorporate information about the solution in the form of plane waves have been proposed. We focus on a class of Trefftz-type discontinuous Galerkin methods that employs trial and test spaces spanned by local plane waves. In this paper we give a priori convergence estimates for the h-version of these plane wave discontinuous Galerkin methods in two dimensions. To that end, we develop new inverse and approximation estimates for plane waves and use these in the context of duality techniques. Asymptotic optimality of the method in a mesh dependent norm can be established. However, the estimates require a minimal resolution of the mesh beyond what it takes to resolve the wavelength. We give numerical evidence that this requirement cannot be dispensed with. It reflects the presence of numerical dispersion. },
author = {Gittelson, Claude J., Hiptmair, Ralf, Perugia, Ilaria},
journal = {ESAIM: Mathematical Modelling and Numerical Analysis},
keywords = {Wave propagation; finite element methods; discontinuous Galerkin methods; plane waves; ultra weak variational formulation; duality estimates; numerical dispersion.; wave propagation; plane waves; numerical dispersion; Helmholtz equation; Trefftz type local trial spaces; convergence; numerical results},
language = {eng},
month = {2},
number = {2},
pages = {297-331},
publisher = {EDP Sciences},
title = {Plane wave discontinuous Galerkin methods: Analysis of the h-version},
url = {http://eudml.org/doc/250619},
volume = {43},
year = {2009},
}

TY - JOUR
AU - Gittelson, Claude J.
AU - Hiptmair, Ralf
AU - Perugia, Ilaria
TI - Plane wave discontinuous Galerkin methods: Analysis of the h-version
JO - ESAIM: Mathematical Modelling and Numerical Analysis
DA - 2009/2//
PB - EDP Sciences
VL - 43
IS - 2
SP - 297
EP - 331
AB - We are concerned with a finite element approximation for time-harmonic wave propagation governed by the Helmholtz equation. The usually oscillatory behavior of solutions, along with numerical dispersion, render standard finite element methods grossly inefficient already in medium-frequency regimes. As an alternative, methods that incorporate information about the solution in the form of plane waves have been proposed. We focus on a class of Trefftz-type discontinuous Galerkin methods that employs trial and test spaces spanned by local plane waves. In this paper we give a priori convergence estimates for the h-version of these plane wave discontinuous Galerkin methods in two dimensions. To that end, we develop new inverse and approximation estimates for plane waves and use these in the context of duality techniques. Asymptotic optimality of the method in a mesh dependent norm can be established. However, the estimates require a minimal resolution of the mesh beyond what it takes to resolve the wavelength. We give numerical evidence that this requirement cannot be dispensed with. It reflects the presence of numerical dispersion.
LA - eng
KW - Wave propagation; finite element methods; discontinuous Galerkin methods; plane waves; ultra weak variational formulation; duality estimates; numerical dispersion.; wave propagation; plane waves; numerical dispersion; Helmholtz equation; Trefftz type local trial spaces; convergence; numerical results
UR - http://eudml.org/doc/250619
ER -

References

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