A convected frequency-domain equivalent source approach for aeroacoustic scattering prediction of sources in a moving medium

Leonidas Siozos-Rousoulis, Orestis Amoiridis, Zhongjie Huang, Tim De Troyer, Anestis I. Kalfas, Ghader Ghorbaniasl

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this paper, a convected frequency-domain approach for acoustic scattering prediction is
suggested, for sources and scattering surfaces in a uniform constant flow. Frequencydomain
moving-medium formulations are used for prediction of the incident acoustic
pressure and acoustic pressure gradient. The latter is required for evaluation of the
hardwall boundary condition in a moving medium and allows a convected definition of the
equivalent sources. The scattering approach is validated by the analytical case of scattering
of a pulsating monopole source by a rigid sphere. The applicability of the methodology to
moving-medium problems is demonstrated for rotating and pulsating monopole point
sources in a uniform flow, located near an infinite flat scattering surface. The suggested
approach allows frequency-domain scattering predictions for sources in a uniform constant
flow of any subsonic velocity, enabling direct inclusion of convection effects on
incident and scattered acoustics. The hardwall boundary condition is thus evaluated
directly in a moving medium. The need for a Lorentz transform is obviated, overcoming the
complexity it introduces and the limitations it imposes.
Original languageEnglish
Pages (from-to)88-104
Number of pages17
JournalJOURNAL OF SOUND AND VIBRATION
Volume431
DOIs
Publication statusPublished - 29 Sep 2018

Keywords

  • Acoustic pressure gradient
  • Acoustic scattering
  • Computational aeroacoustics
  • Equivalent sources
  • Moving medium

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