A numerical study on the stability of a class of Helmholtz problems

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Detail(s)

Original languageEnglish
Pages (from-to)46-59
Journal / PublicationJournal of Computational Physics
Volume287
Online published11 Feb 2015
Publication statusPublished - 15 Apr 2015

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DOI

DOI
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Link to Scopus https://www.scopus.com/record/display.uri?eid=2-s2.0-84923036350&origin=recordpage
Permanent Link https://scholars.cityu.edu.hk/en/publications/publication(a741cd5c-1e8e-4213-ba54-0a62325cf4b9).html

Abstract

This paper concerns the stability of a class of Helmholtz problems in rectangular domains. A well known application is the electromagnetic scattering from a rectangular cavity embedded in an infinite ground plane. Error analysis of numerical methods for cavity problems relies heavily on the stability estimates. However, it is extremely difficult to derive an optimal stability bound with the explicit dependency on wave numbers. In this paper a high-order finite element approximation is proposed for calculating the stability bound. Numerical experiments show that the stability depends strongly on wave numbers in extreme case and it is almost independent on the wave numbers in an average sense. Our numerical results also help to understand the stability of the multi-frequency inverse problems.

Research Area(s)

  • Helmholtz problems, Numerical study, Stability, Tensor-product FEM

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Publication fingerprints text

100
Class Mathematics
100
Numerical Analysis Mathematics
100
Wave Number Mathematics
100
stability INIS
100
numerical analysis INIS
100
Wave number Keyphrases
100
Helmholtz Problem Keyphrases
66
Bounds Mathematics
66
Stability Bound Keyphrases
33
Order Mathematics
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Citation Format(s)

[ RIS ] [ BibTeX ]
A numerical study on the stability of a class of Helmholtz problems. / Du, Kui; Li, Buyang; Sun, Weiwei.
In: Journal of Computational Physics, Vol. 287, 15.04.2015, p. 46-59.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review