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Large Eddy Simulation of a turbulent flow past a pair of symmetric backward-facing steps: A sensitivity analysis

Duwig, Christophe LU ; Salewski, Mirko LU and Fuchs, Laszlo LU (2007) 45th AIAA Aerospace Sciences Meeting 2007 In Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting 16. p.11096-11114
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 of the walls. The LES results are compared to LDA measurements showing the ability of the present numerical tool to capture the complex features of the flow. Furthermore, a sensitivity study is conducted in order to assess the influence of the grid resolution, inflow boundary, channel width (aspect ratio A <sub>h</sub>) and step size (h) on the flow field. The flow was found to be weakly sensitive to the grid, assuring the quality of the simulation results. The inflow boundary influences the results only... (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 of the walls. The LES results are compared to LDA measurements showing the ability of the present numerical tool to capture the complex features of the flow. Furthermore, a sensitivity study is conducted in order to assess the influence of the grid resolution, inflow boundary, channel width (aspect ratio A <sub>h</sub>) and step size (h) on the flow field. The flow was found to be weakly sensitive to the grid, assuring the quality of the simulation results. The inflow boundary influences the results only marginally unless low frequency fluctuations are applied. In this case, the flow field recovers symmetry with suppression of the jet bending. The jet bending has also been shown to increase with the step size h and to reduce with increasing A<sub>h</sub>. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Inflow boundary, Jet bending, Grid resolution
in
Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
volume
16
pages
11096 - 11114
publisher
American Institute of Aeronautics and Astronautics
conference name
45th AIAA Aerospace Sciences Meeting 2007
external identifiers
  • Scopus:34250872176
ISBN
978-1-56347-890-1
language
English
LU publication?
yes
id
51f2a0d3-d092-4a9a-abf8-83d7386a51f6 (old id 643458)
date added to LUP
2007-12-04 14:33:14
date last changed
2016-10-13 04:50:24
@misc{51f2a0d3-d092-4a9a-abf8-83d7386a51f6,
  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 of the walls. The LES results are compared to LDA measurements showing the ability of the present numerical tool to capture the complex features of the flow. Furthermore, a sensitivity study is conducted in order to assess the influence of the grid resolution, inflow boundary, channel width (aspect ratio A &lt;sub&gt;h&lt;/sub&gt;) and step size (h) on the flow field. The flow was found to be weakly sensitive to the grid, assuring the quality of the simulation results. The inflow boundary influences the results only marginally unless low frequency fluctuations are applied. In this case, the flow field recovers symmetry with suppression of the jet bending. The jet bending has also been shown to increase with the step size h and to reduce with increasing A&lt;sub&gt;h&lt;/sub&gt;.},
  author       = {Duwig, Christophe and Salewski, Mirko and Fuchs, Laszlo},
  isbn         = {978-1-56347-890-1},
  keyword      = {Inflow boundary,Jet bending,Grid resolution},
  language     = {eng},
  pages        = {11096--11114},
  publisher    = {ARRAY(0x877af20)},
  series       = {Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting},
  title        = {Large Eddy Simulation of a turbulent flow past a pair of symmetric backward-facing steps: A sensitivity analysis},
  volume       = {16},
  year         = {2007},
}