High-order finite elements for the solution of Helmholtz problems

Konstantinos Christodoulou, Omar Laghrouche, M. Shadi Mohamed, Jon Trevelyan

Research output: Contribution to journalArticle

16 Citations (Scopus)
69 Downloads (Pure)

Abstract

In this paper, two high-order finite element models are investigated for the solution of two-dimensional wave problems governed by the Helmholtz equation. Plane wave enriched finite elements, developed in the Partition of Unity Finite Element Method (PUFEM), and high-order Lagrangian-polynomial based finite elements are considered. In the latter model, the Chebyshev-Gauss-Lobatto nodal distribution is adopted and the approach is often referred to as the Spectral Element Method (SEM). The two strategies, PUFEM and SEM, were developed separately and the current study provides data on how they compare for solving short wave problems, in which the characteristic dimension is a multiple of the wavelength. The considered test examples include wave scattering by a rigid circular cylinder, evanescent wave cases and propagation of waves in a duct with rigid walls. The two approaches are assessed in terms of accuracy for increasing SEM order and PUFEM enrichment. The conditioning, discretization level, total number of storage locations and total number of non-zero entries are also compared.
Original languageEnglish
Pages (from-to)129–139
JournalComputers and Structures
Volume191
Early online date30 Jun 2017
DOIs
Publication statusPublished - 15 Oct 2017

Keywords

  • Helmholtz equation
  • high-order elements
  • evanescent waves
  • wave scattering
  • PUFEM
  • plane waves

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