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Large eddy simulations of turbulent swirling flows in a dump combustor: a sensitivity study

Wang, Ping LU and Bai, Xue-Song LU (2005) In International Journal for Numerical Methods in Fluids 47(2). p.99-120
Abstract
Large eddy simulations (LES) of confined turbulent swirling flows in a model dump combustor are carried out. The simulations are based on a high-order finite difference method on a Cartesian grid, with the sub-grid scale stress tensor modelled using a scale-similarity model. The aims of this work are to study the physics of the flow and to evaluate the performance of LES method for simulation of the major features of turbulent swirling flows-the vortex breakdown, the highly anisotropic and fast-decaying turbulence structure. Influences of inflow/outflow conditions, combustor geometry, inlet swirl profile and Reynolds numbers on the vortex breakdown and turbulence structures are investigated. At very high swirl levels, the influence of the... (More)
Large eddy simulations (LES) of confined turbulent swirling flows in a model dump combustor are carried out. The simulations are based on a high-order finite difference method on a Cartesian grid, with the sub-grid scale stress tensor modelled using a scale-similarity model. The aims of this work are to study the physics of the flow and to evaluate the performance of LES method for simulation of the major features of turbulent swirling flows-the vortex breakdown, the highly anisotropic and fast-decaying turbulence structure. Influences of inflow/outflow conditions, combustor geometry, inlet swirl profile and Reynolds numbers on the vortex breakdown and turbulence structures are investigated. At very high swirl levels, the influence of the outflow conditions and the outlet geometry is fairly significant, not only at downstream near the outlet, but also at far upstream. At low Reynolds numbers, the onset of vortex breakdown is fairly sensitive to the change of Reynolds number; however, at high Reynolds numbers it is rather insensitive to the Reynolds number. Comparisons of LES results with experimental data are made. The LES results are shown to be in reasonably good agreement with the experimental data if appropriate inflow and outflow boundary conditions are imposed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
boundary conditions, vortex breakdown, internal recirculation zone, swirling flow, large eddy simulation
in
International Journal for Numerical Methods in Fluids
volume
47
issue
2
pages
99 - 120
publisher
John Wiley & Sons
external identifiers
  • wos:000226079300001
  • scopus:11244337238
ISSN
1097-0363
DOI
10.1002/fld.781
language
English
LU publication?
yes
id
24e28316-dd02-4410-8c1f-36383a5a8a79 (old id 257943)
date added to LUP
2007-08-16 17:01:52
date last changed
2017-09-17 05:35:27
@article{24e28316-dd02-4410-8c1f-36383a5a8a79,
  abstract     = {Large eddy simulations (LES) of confined turbulent swirling flows in a model dump combustor are carried out. The simulations are based on a high-order finite difference method on a Cartesian grid, with the sub-grid scale stress tensor modelled using a scale-similarity model. The aims of this work are to study the physics of the flow and to evaluate the performance of LES method for simulation of the major features of turbulent swirling flows-the vortex breakdown, the highly anisotropic and fast-decaying turbulence structure. Influences of inflow/outflow conditions, combustor geometry, inlet swirl profile and Reynolds numbers on the vortex breakdown and turbulence structures are investigated. At very high swirl levels, the influence of the outflow conditions and the outlet geometry is fairly significant, not only at downstream near the outlet, but also at far upstream. At low Reynolds numbers, the onset of vortex breakdown is fairly sensitive to the change of Reynolds number; however, at high Reynolds numbers it is rather insensitive to the Reynolds number. Comparisons of LES results with experimental data are made. The LES results are shown to be in reasonably good agreement with the experimental data if appropriate inflow and outflow boundary conditions are imposed.},
  author       = {Wang, Ping and Bai, Xue-Song},
  issn         = {1097-0363},
  keyword      = {boundary conditions,vortex breakdown,internal recirculation zone,swirling flow,large eddy simulation},
  language     = {eng},
  number       = {2},
  pages        = {99--120},
  publisher    = {John Wiley & Sons},
  series       = {International Journal for Numerical Methods in Fluids},
  title        = {Large eddy simulations of turbulent swirling flows in a dump combustor: a sensitivity study},
  url          = {http://dx.doi.org/10.1002/fld.781},
  volume       = {47},
  year         = {2005},
}