Large Eddy Simulation of a turbulent flow past a pair of symmetric backward-facing steps: A sensitivity analysis
Författare
Summary, in English
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>.
Avdelning/ar
Publiceringsår
2007
Språk
Engelska
Sidor
11096-11114
Publikation/Tidskrift/Serie
Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
Volym
16
Dokumenttyp
Konferensbidrag
Förlag
American Institute of Aeronautics and Astronautics
Ämne
- Fluid Mechanics and Acoustics
Nyckelord
- Inflow boundary
- Jet bending
- Grid resolution
Conference name
45th AIAA Aerospace Sciences Meeting 2007
Conference date
2007-01-08 - 2007-01-11
Conference place
Reno, NV, United States
Status
Published
ISBN/ISSN/Övrigt
- ISBN: 978-1-56347-890-1