A combined analytical and numerical analysis of the flow-acoustic coupling in a cavity-pipe system

Mikael A. Langthjem, Masami Nakano

Research output: Contribution to journalArticle

Abstract

The generation of sound by flow through a closed, cylindrical cavity (expansion chamber) accommodated with a long tailpipe is investigated analytically and numerically. The sound generation is due to self-sustained flow oscillations in the cavity. These oscillations may, in turn, generate standing (resonant) acoustic waves in the tailpipe. The main interest of the paper is in the interaction between these two sound sources. An analytical, approximate solution of the acoustic part of the problem is obtained via the method of matched asymptotic expansions. The sound-generating flow is represented by a discrete vortex method, based on axisymmetric vortex rings. It is demonstrated through numerical examples that inclusion of acoustic feedback from the tailpipe is essential for a good representation of the sound characteristics.

Original languageEnglish
Pages (from-to)451-473
Number of pages23
JournalTheoretical and Computational Fluid Dynamics
Volume32
Issue number4
DOIs
Publication statusPublished - 2018 Aug 1

Keywords

  • Aeroacoustics
  • Discrete vortex method
  • Flow–sound interaction
  • Matched asymptotic expansions
  • Self-sustained flow oscillations
  • Vortex sound

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Engineering(all)
  • Fluid Flow and Transfer Processes

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