Direct numerical simulation of coherent perturbations in a low mach number turbulent channel flow
2014 (English)In: 21st International Congress on Sound and Vibration 2014, ICSV 2014, 2014, Vol. 3, 2019-2026 p.Conference paper (Refereed)
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.
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
IdentifiersURN: urn:nbn:se:kth:diva-167558ScopusID: 2-s2.0-84922633703ISBN: 9781634392389OAI: oai:DiVA.org:kth-167558DiVA: diva2:818071
21st International Congress on Sound and Vibration 2014, ICSV 2014, 13 July 2014 through 17 July 2014
QC 201506082015-06-082015-05-222015-06-08Bibliographically approved