A hybrid PSTD/DG method to solve the linearized Euler equations

Raúl Pagán Muñoz, Maarten Hornikx

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Abstract

The Fourier Pseudospectral Time Domain (Fourier-PSTD) method was shown to be an effective way of modelling wave propagation. Fourier-PSTD is based on Fourier analysis and synthesis to compute the spatial derivatives of the governing wave equation. Therefore, the method suffers from the well-known Gibbs phenomenon when computing a non-smooth or discontinuous function. This limits its possibilities to compute arbitrary boundary conditions. Furthermore, the method needs to be computed on a regular mesh. Although some developments have been presented to locally refine the grid using multidomain implementations, its performance is limited when computing complex geometries. This paper presents a hybrid approach to solve the linearized Euler equations, coupling the Fourier-PSTD method with a nodal Discontinuous Galerkin (DG) method. DG exhibits almost no restrictions with respect to geometrical complexity or boundary conditions. The aim of this novel method is to allow the computation of arbitrary boundary conditions and complex geometries by using the benefits of the DG method while keeping Fourier-PSTD in the bulk of the domain. In this paper, a coupling algorithm is presented together with an analysis of the precision of the hybrid approach.

Original languageEnglish
Title of host publicationEuronoise 2015, the 10th European Congress and Exposition on Noise Control Engineering, May 31 - June 3, 2015, Maastricht, The Netherlands
PublisherC. Glorieux
Pages291-296
Number of pages6
Publication statusPublished - Jun 2015
Event10th European Congress and Exposition on Noise Control Engineering (Euronoise 2015) - Maastricht, Netherlands
Duration: 31 May 20153 Jun 2015
Conference number: 10
http://www.euronoise2015.eu

Conference

Conference10th European Congress and Exposition on Noise Control Engineering (Euronoise 2015)
Abbreviated titleEuronoise 2015
Country/TerritoryNetherlands
CityMaastricht
Period31/05/153/06/15
Internet address

Keywords

  • Hybrid
  • Pseudospectral
  • Discontinuous Galerkin
  • Fourier
  • Linearized Euler equations
  • Time domain
  • Acoustics
  • Numerical methods
  • Wave propagation
  • Gibbs

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