Effects of fluid-structure interaction on trailing-edge noise

Youngmin Bae, Jae Young Jang, Young J. Moon

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    This study numerically investigates the effects of fluid-structure interaction (FSI) on the trailing-edge noise, particularly for the cases of wake instability and Karman vortex shedding. The trailing edge is modeled as a flat plate with an elastic cantilever end and its flow-induced vibration is solved by an eigenmode analysis with the Galerkin method. The flow and sound coupled in the FSI analysis are computed on the moving grid by a direct numerical simulation (DNS) procedure. The computed result of wake instability shows that when the first-eigenmode natural frequency ω n of the cantilever is close to be resonant with the wake characteristic frequency ω c , the sound pressure level (SPL) is significantly reduced by 20 dB at ω nc =0.95, or increased by 15 dB at ω nc =1.05, for all angles. For the Karman vortex shedding, a similar frequency modulation occurs via FSI, if ω n is close to ω c . The flow and acoustic details are somewhat different for this case but a considerable noise reduction was also possible for angles from -120° to +120°.

    Original languageEnglish
    Pages (from-to)1426-1435
    Number of pages10
    JournalJournal of Mechanical Science and Technology
    Volume22
    Issue number7
    DOIs
    Publication statusPublished - 2008 Jul

    Keywords

    • Fluid-structure interaction
    • Frequency modulation
    • Karman vortex shedding
    • Trailing-edge noise reduction
    • Wake instability

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering

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