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Lattice-Boltzmann Simulations Of Flows Over Backward-Facing Inclined Steps

Author

Listed:
  • 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)

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.

Suggested Citation

  • Rupesh B. Kotapati & Richard Shock & Hudong Chen, 2014. "Lattice-Boltzmann Simulations Of Flows Over Backward-Facing Inclined Steps," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 25(01), pages 1-14.
    • Handle: RePEc:wsi:ijmpcx:v:25:y:2014:i:01:n:s0129183113400214
    DOI: 10.1142/S0129183113400214
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    References listed on IDEAS

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    1. Lewandowski, Witold M. & Radziemska, Ewa & Buzuk, Maciej & Bieszk, Henryk, 2000. "Free convection heat transfer and fluid flow above horizontal rectangular plates," Applied Energy, Elsevier, vol. 66(2), pages 177-197, June.
    2. Bogaerts, Ph. & Castillo, J. & Hanus, R., 1997. "Analytical solution of the non-uniform heat exchange in a reactor cooling coil with constant fluid flow," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 43(2), pages 101-113.
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