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Direct numerical simulation of coherent perturbations in a low mach number turbulent channel flow
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. (Marcus Wallenberg Laboratory for Sound and Vibration)
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. (Marcus Wallenberg Laboratory for Sound and Vibration)ORCID iD: 0000-0003-4103-0129
KTH, School of Engineering Sciences (SCI), Mechanics. Swedish Defence Research Agency, FOI, Sweden .ORCID iD: 0000-0002-5913-5431
2014 (English)In: 21st International Congress on Sound and Vibration 2014, ICSV 2014, 2014, Vol. 3, 2019-2026 p.Conference paper, Published paper (Refereed)
Abstract [en]

When acoustic wave propagates in turbulent flows, the modulated turbulent stresses can cause wave attenuation. Recently the present authors proposed a non-equilibrium model to determine the effective turbulent stress acting on the acoustic wave in duct flows, which can be used to predict the wave attenuation caused by turbulent mixing. The model reveals that the modulated turbulent stress and the wave shear strain rate near the wall are out of phase for a certain range of the Strouhal number. In this paper, direct numerical simulation (DNS) of small coherent perturbations in turbulent channel flow is performed to validate the model. The simulation results confirms the predictions by the proposed model.

Place, publisher, year, edition, pages
2014. Vol. 3, 2019-2026 p.
Keyword [en]
Acoustic wave propagation, Acoustic waves, Acoustics, Channel flow, Direct numerical simulation, Fluid dynamics, Mach number, Numerical models, Shear strain, Strain rate, Turbulent flow, Coherent perturbation, Low Mach numbers, Non-equilibrium modeling, Out of phase, Turbulent channel flows, Turbulent mixing, Turbulent stress, Wave attenuation, Shear flow
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-167558Scopus ID: 2-s2.0-84922633703ISBN: 9781634392389 (print)OAI: oai:DiVA.org:kth-167558DiVA: diva2:818071
Conference
21st International Congress on Sound and Vibration 2014, ICSV 2014, 13 July 2014 through 17 July 2014
Note

QC 20150608

Available from: 2015-06-08 Created: 2015-05-22 Last updated: 2015-06-08Bibliographically approved

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Boij, SusannHanifi, Ardeshir

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