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An advanced switching parameter for a hybrid LES/RANS model considering the characteristics of near-wall turbulent length scales

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Abstract

In this study, we proposed an idea for an advanced switching parameter used in a hybrid approach connecting large eddy simulation (LES) with Reynolds-averaged Navier–Stokes modeling [the hybrid LES/RANS (HLR) model]. Although the HLR model is promising way to predict engineering turbulent flows, an important problem is that RANS is always adopted in the near-wall region, even if the grid resolution is fine enough for LES. To overcome this difficulty, the switching parameter proposed here introduced knowledge of the Kolmogorov microscale that is thought to be reasonable for representing the near-wall turbulence. This parameter enabled the present HLR model to be smoothly replaced by a full LES if a grid resolution was fine enough in the near-wall region. To confirm model performance, the present HLR model was applied to numerical simulations of a periodic hill flow as well as fundamental plane channel flows. The model generally provided reasonable predictions for these test cases that include complex turbulence with massive flow separation.

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Authors and Affiliations

  1. Department of Aeronautics and Astronautics, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan

    Ken-ichi Abe

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  1. Ken-ichi Abe
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Correspondence to Ken-ichi Abe.

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Communicated by Tim Colonius.

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Abe, Ki. An advanced switching parameter for a hybrid LES/RANS model considering the characteristics of near-wall turbulent length scales. Theor. Comput. Fluid Dyn. 28, 499–519 (2014). https://doi.org/10.1007/s00162-014-0328-3

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  • DOI: https://doi.org/10.1007/s00162-014-0328-3

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