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Comparative Study of DNS, LES and Hybrid LES/RANS of Turbulent Boundary Layer with Heat Transfer Over 2d Hill

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Abstract

This paper first presents the turbulent heat transfer phenomenon of the boundary layer over a 2-dimensional hill using the direct numerical simulation (DNS). DNS results reveal turbulent heat transfer phenomena in the boundary layer over a 2-dimensional hill affected by the flow acceleration and the concave wall at the foreface of a hill, the convex wall at the top of the hill, and the flow deceleration, separation, and reattachment and the concave wall at the back of the hill. The prediction of turbulent heat transfer, the turbulence models of LES and HLR should be assessed in such heat transfer because these models have seldom been evaluated in the complex turbulent heat transfer. Therefore, this paper also presents evaluations of predictions of LES and HLR in the complicated turbulent heat transfer which is the boundary layer with heat transfer over a 2-dimensional hill. Consequently, this paper obviously shows the detailed turbulent heat transfer phenomena of a boundary layer over a 2-dimensional hill via DNS, and the evaluation results of prediction accuracy of LES and HLR for the heat transfer. LES and HLR give good prediction in comparison with DNS results, but the predicted reattachment and separation points are slightly different from DNS.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan

    H. Hattori & T. Umehara

  2. Department of Research, Nagoya Industrial Science Research Institute, Yotsuya-dori 1-13, Chikusa-ku, Nagoya, 464-0819, Japan

    Y. Nagano

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  1. H. Hattori
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  2. T. Umehara
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  3. Y. Nagano
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Correspondence to H. Hattori.

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Hattori, H., Umehara, T. & Nagano, Y. Comparative Study of DNS, LES and Hybrid LES/RANS of Turbulent Boundary Layer with Heat Transfer Over 2d Hill. Flow Turbulence Combust 90, 491–510 (2013). https://doi.org/10.1007/s10494-013-9450-3

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