LATTICE-BOLTZMANN SIMULATIONS OF FLOWS OVER BACKWARD-FACING INCLINED STEPS

Rupesh B. Kotapati (), Richard Shock () and Hudong Chen ()
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Rupesh B. Kotapati: Exa Corporation, 55 Network Drive, Burlington, MA 01803, USA
Richard Shock: Exa Corporation, 55 Network Drive, Burlington, MA 01803, USA
Hudong Chen: Exa Corporation, 55 Network Drive, Burlington, MA 01803, USA

International Journal of Modern Physics C (IJMPC), 2014, vol. 25, issue 01, 1-14

Abstract: The lattice-Boltzmann method (LBM) is used in conjunction with a very large-eddy simulation (VLES) turbulence modeling approach to compute separated flows over backward-facing steps at different wall inclination angles. The Reynolds numberReHbased on the step heightHand center-line velocity at the channel inletuclis 64 000. The expansion ratio of the outlet section to the inlet section of the channel is 1.48. Wall inclination angles α considered include 10°, 15°, 20°, 25°, 30° and 90°. The computed flow fields for different inclination angles of the step are assessed against the laser Doppler anemometry (LDA) measurements of Makiola [B. Makiola, Ph.D. Thesis, University of Karlsruhe (1992); B. Ruck and B. Makiola, Flow separation over the step with inclined walls, inNear-Wall Turbulent Flows, eds. R. M. C. So, C. G. Speziale and B. E. Launder (Elsevier, 1993), p. 999.]. In addition to validating the lattice-Boltzmann solution with the experiments, this study also investigates the effects of three dimensionality, the proximity of the inlet to the step, and the grid resolution on the quality of the predictions.

Keywords: Lattice-Boltzmann simulations; very large-eddy simulations; backward-facing inclined steps; separated flows (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1142/S0129183113400214

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