A numerical study of open-loop control of bluff body aeroacoustics using periodic forcing

Ka Him Seid, Chi Kin Randolph Leung, Guangyuan Huang

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Flow past bluff bodies has received immense attention from fluid dynamists as it underpins various flow-induced structural and noise phenomena in engineering applications. In the present study, the effects of temporally periodic, open-loop actuation on the generation of sound by a square cylinder in a uniform flow are investigated by direct aeroacoustics simulation (DAS), which solves the two-dimensional, unsteady, fully compressible Navier-Stokes equations using the space-Time conservation element and solution element (CE/SE) method. For the sake of simplicity, the flow is set a low Mach number (Ma = 0.2) and a low Reynolds number (Re = 200) based on the cylinder size. The DAS solution is validated using experiment and numerical results in literature and the sound generation is studied quantitatively. An open-loop strategy is adopted with periodic blowing and suction actuations located near the real separation points of the cylinder. It is found that the aerodynamic characteristics and the sound generation can be controlled though manipulation of the vortex shedding. When the actuation amplitude is large, flow fluctuation in the wake is in general locked in phase to the actuation and reduces the control efficiency. The present study compares the natural and controlled flow cases and provides insight on the effectiveness of time-periodic forcing for the control of bluff body aeroacoustics.
Original languageEnglish
Title of host publicationINTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet
PublisherInstitute of Noise Control Engineering
Publication statusPublished - 1 Jan 2017
Event46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017 - Hong Kong Convention and Exhibition Centre (HKCEC), Hong Kong, Hong Kong
Duration: 27 Aug 201730 Aug 2017

Conference

Conference46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017
Country/TerritoryHong Kong
CityHong Kong
Period27/08/1730/08/17

Keywords

  • Active noise control
  • Aeroacoustics
  • Square cylinder

ASJC Scopus subject areas

  • Automotive Engineering
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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