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 journalArticlepeer-review

    9 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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