Sound and turbulence modulation by particles in highspeed shear flows
Abstract
Highspeed freeshearflow turbulence, laden with droplets or particles, can radiate weaker pressure fluctuations than its unladen counterpart. In this study, Eulerian–Lagrangian simulations of highspeed temporally evolving shear layers laden with monodisperse, adiabatic, inertial particles are used to examine particle–turbulence interactions and their effect on radiated pressure fluctuations. An evolution equation for gasphase pressure intensity is formulated for particleladen flows, and local mechanisms of pressure changes are quantified over a range of Mach numbers and particle mass loadings. Particle–turbulence interactions alter the local pressure intensity directly via volume displacement (due to the flow of finitesize particles) and drag coupling (due to local slip velocity between phases), and indirectly through significant turbulence changes. The sound radiation intensity near subsonic mixing layers increases with mass loading, consistent with existing low Mach number theory. For supersonic flows, sound levels decrease with mass loading, consistent with trends observed in previous experiments. Particleladen cases exhibit reduced turbulent kinetic energy compared to singlephase flow, providing one source of their sound changes; however, the subsonic flow does not support such an obvious sourcetosound decomposition to explain its sound intensity increase. Despite its decrease in turbulence intensity, the louder particleladen subsonic flows show an increase in the magnitude andmore »
 Authors:

 Univ. of Illinois at UrbanaChampaign, IL (United States). Coordinated Science Laboratory
 Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Mechanical Engineering
 Publication Date:
 Research Org.:
 Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); UTBattelle LLC/ORNL, Oak Ridge, TN (Unted States)
 Sponsoring Org.:
 USDOE Office of Science (SC)
 OSTI Identifier:
 1565740
 DOE Contract Number:
 AC0500OR22725
 Resource Type:
 Journal Article
 Journal Name:
 Journal of Fluid Mechanics
 Additional Journal Information:
 Journal Volume: 875; Journal ID: ISSN 00221120
 Publisher:
 Cambridge University Press
 Country of Publication:
 United States
 Language:
 English
 Subject:
 Mechanics; Physics
Citation Formats
Buchta, David A., Shallcross, Gregory, and Capecelatro, Jesse. Sound and turbulence modulation by particles in highspeed shear flows. United States: N. p., 2019.
Web. doi:10.1017/jfm.2019.467.
Buchta, David A., Shallcross, Gregory, & Capecelatro, Jesse. Sound and turbulence modulation by particles in highspeed shear flows. United States. doi:10.1017/jfm.2019.467.
Buchta, David A., Shallcross, Gregory, and Capecelatro, Jesse. Thu .
"Sound and turbulence modulation by particles in highspeed shear flows". United States. doi:10.1017/jfm.2019.467.
@article{osti_1565740,
title = {Sound and turbulence modulation by particles in highspeed shear flows},
author = {Buchta, David A. and Shallcross, Gregory and Capecelatro, Jesse},
abstractNote = {Highspeed freeshearflow turbulence, laden with droplets or particles, can radiate weaker pressure fluctuations than its unladen counterpart. In this study, Eulerian–Lagrangian simulations of highspeed temporally evolving shear layers laden with monodisperse, adiabatic, inertial particles are used to examine particle–turbulence interactions and their effect on radiated pressure fluctuations. An evolution equation for gasphase pressure intensity is formulated for particleladen flows, and local mechanisms of pressure changes are quantified over a range of Mach numbers and particle mass loadings. Particle–turbulence interactions alter the local pressure intensity directly via volume displacement (due to the flow of finitesize particles) and drag coupling (due to local slip velocity between phases), and indirectly through significant turbulence changes. The sound radiation intensity near subsonic mixing layers increases with mass loading, consistent with existing low Mach number theory. For supersonic flows, sound levels decrease with mass loading, consistent with trends observed in previous experiments. Particleladen cases exhibit reduced turbulent kinetic energy compared to singlephase flow, providing one source of their sound changes; however, the subsonic flow does not support such an obvious sourcetosound decomposition to explain its sound intensity increase. Despite its decrease in turbulence intensity, the louder particleladen subsonic flows show an increase in the magnitude and timerateofchange of fluid dilatation, providing a mechanism for its increased sound radiation. Contrasting this, the quieter supersonic particleladen flows exhibit decreased gasphase dilatation yet its timerateofchange is relatively insensitive to mass loading, supporting such a connection.},
doi = {10.1017/jfm.2019.467},
journal = {Journal of Fluid Mechanics},
issn = {00221120},
number = ,
volume = 875,
place = {United States},
year = {2019},
month = {7}
}
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