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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

PREDICTION OF TIME-MEAN CHARACTERISTICS AND PERIODICAL FLUCTUATION OF VELOCITY AND THERMAL FIELDS OF A BACKWARD-FACING STEP

Kazuya Tatsumi
Department of Mechanical Engineering and Science, Kyoto University; Advanced Research Institute of Fluid Science and Engineering, Kyoto University

Hiroshi Iwai
Dept. of Aeronautics and Astronautics, Department of Mechanical Engineering Kyoto University

Eng Chong Neo
Department of Mechanical Engineering Kyoto University, Kyoto 606-8501, Japan

K. Inaoka
Department of Mechanical Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan

Kenjiro Suzuki
Department of Mechanical Engineering, Kyoto University, Kyoto; Department of Machinery and Control Systems, Shibaura Institute of Technology, 307 Fukasaku, Saitama, 337-8570, Japan

Abstract

The present study presents the results of a three-component decomposition approach for the two- and three-dimensional computations of a turbulent flow over a backward-facing step. By this approach, effect of periodical fluctuation on the studied flow and temperature field incurred by the discrete counter-rotating vortices appearing in the free shear layer is discussed. Consequently, significance of the influence of this periodical fluctuation to the instantaneous fluid and heat transfer characteristics and eventually to the time mean momentum and heat transfer is demonstrated.