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Simulations of a turbulent flow past a sudden expansion: A sensitivity analysis

Duwig, Christophe LU ; Salewski, Mirko LU and Fuchs, Laszlo LU (2008) In AIAA Journal 46(2). p.408-419
Abstract
Large eddy simulation is used to study the flow behind a pair of symmetric backward-facing steps. As reported in the literature, the flow exhibits an asymmetric pattern characterized by the deflection of the jet toward one of the walls. The large eddy simulation results are compared with laser Doppler anemometry measurements showing the ability of the present numerical tool to capture the complex features of the flow. Furthermore, a sensitivity study is conducted to assess the influence of the grid resolution, the inflow boundary, the channel width, and the step size on the flowfield. The flow was found to be only weakly sensitive to the grid, assuring the quality of the simulation results. The inflow boundary influences the mean results... (More)
Large eddy simulation is used to study the flow behind a pair of symmetric backward-facing steps. As reported in the literature, the flow exhibits an asymmetric pattern characterized by the deflection of the jet toward one of the walls. The large eddy simulation results are compared with laser Doppler anemometry measurements showing the ability of the present numerical tool to capture the complex features of the flow. Furthermore, a sensitivity study is conducted to assess the influence of the grid resolution, the inflow boundary, the channel width, and the step size on the flowfield. The flow was found to be only weakly sensitive to the grid, assuring the quality of the simulation results. The inflow boundary influences the mean results only marginally unless low-frequency fluctuations are applied. In this case, the flowfield recovers a mean symmetry with suppression of the jet bending. The jet mean bending has also been shown to increase with the step size h and to decrease with increasing channel width. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
AIAA Journal
volume
46
issue
2
pages
408 - 419
publisher
American Institute of Aeronautics and Astronautics
external identifiers
  • wos:000252822800012
  • scopus:43649083196
ISSN
1533-385X
DOI
10.2514/1.30149
language
English
LU publication?
yes
id
1409d2ef-fe3f-4dfa-8263-58df048cc14c (old id 1199228)
date added to LUP
2008-09-11 11:00:22
date last changed
2017-01-01 04:35:56
@article{1409d2ef-fe3f-4dfa-8263-58df048cc14c,
  abstract     = {Large eddy simulation is used to study the flow behind a pair of symmetric backward-facing steps. As reported in the literature, the flow exhibits an asymmetric pattern characterized by the deflection of the jet toward one of the walls. The large eddy simulation results are compared with laser Doppler anemometry measurements showing the ability of the present numerical tool to capture the complex features of the flow. Furthermore, a sensitivity study is conducted to assess the influence of the grid resolution, the inflow boundary, the channel width, and the step size on the flowfield. The flow was found to be only weakly sensitive to the grid, assuring the quality of the simulation results. The inflow boundary influences the mean results only marginally unless low-frequency fluctuations are applied. In this case, the flowfield recovers a mean symmetry with suppression of the jet bending. The jet mean bending has also been shown to increase with the step size h and to decrease with increasing channel width.},
  author       = {Duwig, Christophe and Salewski, Mirko and Fuchs, Laszlo},
  issn         = {1533-385X},
  language     = {eng},
  number       = {2},
  pages        = {408--419},
  publisher    = {American Institute of Aeronautics and Astronautics},
  series       = {AIAA Journal},
  title        = {Simulations of a turbulent flow past a sudden expansion: A sensitivity analysis},
  url          = {http://dx.doi.org/10.2514/1.30149},
  volume       = {46},
  year         = {2008},
}