Effects of fluid-structure interaction on trailing-edge noise

Youngmin Bae, Jae Young Jang, Young J. Moon

Research output: Contribution to journalArticle

3 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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