Advanced

Effects of aerodynamic particle interaction in turbulent non-dilute particle-laden flow

Salewski, Mirko LU and Fuchs, Laszlo LU (2008) In Journal of Turbulence 9(46). p.1-23
Abstract
Aerodynamic four-way coupling models are necessary to handle two-phase flows with a dispersed phase in regimes in which the particles are neither dilute enough to neglect particle interaction nor dense enough to bring the mixture to equilibrium. We include an aerodynamic particle interaction model within the framework of large eddy simulation together with Lagrangian particle tracking. The particle drag coefficients are corrected depending on relative positions of the particles accounting for the strongest drag correction per particle but disregarding many-particle interactions. The approach is applied to simulate monodisperse, rigid, and spherical particles injected into crossflow as an idealization of a spray jet in crossflow. A domain... (More)
Aerodynamic four-way coupling models are necessary to handle two-phase flows with a dispersed phase in regimes in which the particles are neither dilute enough to neglect particle interaction nor dense enough to bring the mixture to equilibrium. We include an aerodynamic particle interaction model within the framework of large eddy simulation together with Lagrangian particle tracking. The particle drag coefficients are corrected depending on relative positions of the particles accounting for the strongest drag correction per particle but disregarding many-particle interactions. The approach is applied to simulate monodisperse, rigid, and spherical particles injected into crossflow as an idealization of a spray jet in crossflow. A domain decomposition technique reduces the computational cost of the aerodynamic particle interaction model. It is shown that the average drag on such particles decreases by more than 40% in the dense particle region in the near-field of the jet due to the introduction of aerodynamic four-way coupling. The jet of monodisperse particles therefore penetrates further into the crossflow in this case. The strength of the counterrotating vortex pair (CVP) and turbulence levels in the flow then decrease. The impact of the stochastic particle description on the four-way coupling model is shown to be relatively small. If particles are also allowed to break up according to a wave breakup model, the particles become polydisperse. An ad hoc model for handling polydisperse particles under such conditions is suggested. In this idealized atomizing mixture, the effect of aerodynamic four-way coupling reverses: The aerodynamic particle interaction results in a stronger CVP and enhances turbulence levels. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
jet in, crossflow, aerodynamic particle interaction, four-way coupling, LES, LPT
in
Journal of Turbulence
volume
9
issue
46
pages
1 - 23
publisher
Taylor & Francis
external identifiers
  • wos:000263094800001
  • scopus:77952831292
ISSN
1468-5248
DOI
10.1080/14685240802577879
language
English
LU publication?
yes
id
5577c52f-f10d-47f6-8ddb-3db451a85408 (old id 1375675)
date added to LUP
2009-05-08 13:40:22
date last changed
2017-04-09 03:54:12
@article{5577c52f-f10d-47f6-8ddb-3db451a85408,
  abstract     = {Aerodynamic four-way coupling models are necessary to handle two-phase flows with a dispersed phase in regimes in which the particles are neither dilute enough to neglect particle interaction nor dense enough to bring the mixture to equilibrium. We include an aerodynamic particle interaction model within the framework of large eddy simulation together with Lagrangian particle tracking. The particle drag coefficients are corrected depending on relative positions of the particles accounting for the strongest drag correction per particle but disregarding many-particle interactions. The approach is applied to simulate monodisperse, rigid, and spherical particles injected into crossflow as an idealization of a spray jet in crossflow. A domain decomposition technique reduces the computational cost of the aerodynamic particle interaction model. It is shown that the average drag on such particles decreases by more than 40% in the dense particle region in the near-field of the jet due to the introduction of aerodynamic four-way coupling. The jet of monodisperse particles therefore penetrates further into the crossflow in this case. The strength of the counterrotating vortex pair (CVP) and turbulence levels in the flow then decrease. The impact of the stochastic particle description on the four-way coupling model is shown to be relatively small. If particles are also allowed to break up according to a wave breakup model, the particles become polydisperse. An ad hoc model for handling polydisperse particles under such conditions is suggested. In this idealized atomizing mixture, the effect of aerodynamic four-way coupling reverses: The aerodynamic particle interaction results in a stronger CVP and enhances turbulence levels.},
  author       = {Salewski, Mirko and Fuchs, Laszlo},
  issn         = {1468-5248},
  keyword      = {jet in,crossflow,aerodynamic particle interaction,four-way coupling,LES,LPT},
  language     = {eng},
  number       = {46},
  pages        = {1--23},
  publisher    = {Taylor & Francis},
  series       = {Journal of Turbulence},
  title        = {Effects of aerodynamic particle interaction in turbulent non-dilute particle-laden flow},
  url          = {http://dx.doi.org/10.1080/14685240802577879},
  volume       = {9},
  year         = {2008},
}