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Simulations of a turbulent flow past a sudden expansion: A sensitivity analysis
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Mechanics of Industrial Processes.
2008 (English)In: AIAA Journal, ISSN 0001-1452, E-ISSN 1533-385X, Vol. 46, no 2, 408-419 p.Conference paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
2008. Vol. 46, no 2, 408-419 p.
Keyword [en]
proper orthogonal decomposition, reynolds-number flows
URN: urn:nbn:se:kth:diva-17288DOI: 10.2514/1.30149ISI: 000252822800012OAI: diva2:335331
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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