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DNS of thermally-stratified turbulent boundary layer over 2-dimensional hill

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2600
pages 2513-2522

Hirofumi Hattori
Information and Analysis Technologies Division, Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showaku, Nagoya 466-8555, JAPAN

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

Tomoya Houra
Department of Electronical and Mechanical Engineering, Department of Environmental Technology, Nagoya Institute of Technology, Gokiso-cho, Showa-ки, Nagoya 466-8555, JAPAN

Masato Tagawa
Department of Electronical and Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, JAPAN

Yasutaka Nagano
Nagoya Industrial Science Research Institute; Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Sinopsis

The objective of this study is to investigate turbulent heat transfer in a thermally-stratified turbulent boundary layer over a 2-dimensional hill (2DH) by means of direct numerical simulation (DNS). Considering the effect of thermal stratification and wall shape to a flow and thermal fields, in order to investigate and obtain the near-wall distributions of turbulent quantities in various thermally-stratified turbulent boundary layers over a 2DH in detail, DNS is carried out, in which the thermal stratifications are set to stable, neutral and unstable conditions. The present DNS indicates the fundamental and detailed characteristics of turbulent boundary layers with various thermal stratifications over a 2DH, and shows that the effects of the wall shape and the thermal stratifications to the turbulent boundary layer. Also, it is revealed that the counter gradient diffusion phenomenon of thermal field is yielded by the strong stable thermal stratification and the bulging wall shape such as a 2DH.

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