Aeroacoustic tonal noise prediction of open cavity flows involving feedback

Y. J. Moon, J. H. Seo, S. R. Koh, Y. Cho

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A new hydrodynamic/acoustic splitting method is employed to predict aeroacoustic tonal noise of self-sustained oscillatory flows over the open cavity at low Mach numbers. Acoustic field is computed using a sixth-order compact scheme and a fourth-order Runge-Kutta method, with acoustic sources obtained from the unsteady incompressible Navier-Stokes calculation. First, numerical accuracy of the present splitting method is assessed for the aeolian tone generated by Karman vortex shedding from a circular cylinder at ReD = 200 and M = 0.3. A direct comparison was made with solutions of direct acoustic numerical simulation (DaNS) and Curle's acoustic analogy. The fundamental mode characteristics of the cavity flows at (i) Reδ* = 850 and M = 0.077 and (ii) Reδ* = 1620 and M = 0.147 are examined by the present method, verifying the solution with the experimentally measured sound pressure level (SPL) spectra. A dual tone characteristic observed in experiment (Henderson 2000) for case (i) is also confirmed computationally by the present method.

Original languageEnglish
Pages (from-to)359-366
Number of pages8
JournalComputational Mechanics
Volume31
Issue number3-4
DOIs
Publication statusPublished - 2003 Jul

Keywords

  • Computational aero-acoustics
  • Feedback
  • Open cavity
  • Tonal noise

ASJC Scopus subject areas

  • Computational Mechanics
  • Ocean Engineering
  • Mechanical Engineering
  • Computational Theory and Mathematics
  • Computational Mathematics
  • Applied Mathematics

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