Bluff Body Flow and Noise Control Using Porous Media

Syamir Alihan Showkat Ali, Xiao Liu, Mahdi Azarpeyvand

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

13 Citations (Scopus)
318 Downloads (Pure)

Abstract

This research is concerned with the application of porous materials for reducing noise from bluff bodies by stabilizing the vortex shedding and the wake region. To better understand the noise generation and reduction mechanism, steady and unsteady flow measurements have been carried out. Measurements have been performed for unsteady aerodynamics forces, wake velocity fields and frequency energy content of the turbulent structures within the wake. The study is performed using several types of porous materials, with different porosities and permeability constants and over a wide range of Reynolds number. Results show that the use of a porous cover leads to the reduction of drag in every case of square cylinder, but an increase in drag coefficient in the case of circular cylinder at high Reynold numbers. The effect of porous material on the fluctuating lift force has also been investigated and it has been shown that the lift fluctuations can be reduced significantly using porous covers at low frequencies. The PIV results have also shown that the porous cover can delay the vortex shedding and significantly increase the vortex formation length, leading to a very low turbulent near wake region. It has also been observed that the turbulent kinetic energy in the near wake region can be reduced significantly using the porous layer. These findings are particularly important in the case of noise from tandem cylinder configurations where the wake interaction is the primary source of noise.
Original languageEnglish
Title of host publication22nd AIAA/CEAS Aeroacoustics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages23
ISBN (Electronic)9781624103865
DOIs
Publication statusPublished - Jun 2016
Event22nd AIAA/CEAS Aeroacoustics Conference - Lyon, France
Duration: 30 May 2016 → …

Conference

Conference22nd AIAA/CEAS Aeroacoustics Conference
CountryFrance
CityLyon
Period30/05/16 → …

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