Large eddy simulations of turbulent swirling flows in a dump combustor: a sensitivity study
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/257943
- author
- Wang, Ping LU and Bai, Xue-Song LU
- organization
- publishing date
- 2005
- 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 Inc.
- 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
- 2016-04-01 12:36:56
- date last changed
- 2022-04-13 21:22:49
@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}},
keywords = {{boundary conditions; vortex breakdown; internal recirculation zone; swirling flow; large eddy simulation}},
language = {{eng}},
number = {{2}},
pages = {{99--120}},
publisher = {{John Wiley & Sons Inc.}},
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}},
doi = {{10.1002/fld.781}},
volume = {{47}},
year = {{2005}},
}