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Turbulence and Shear Flow Phenomena -1 First International Symposium

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

3-D UNSTEADY FLOW STRUCTURES AROUND RECTANGULAR COLUMN IN OPEN CHANNELS BY MEANS OF NON-LINEAR κ−ε MODEL

Ichiro Kimura
Department of Electro-Mechanics, Osaka Electro-Communication University, Osaka; Department of Environmental and Information Sciences, Yokkaichi University 1200 Kayo-cho, Yokkaichi 512-8512, Japan

Takashi Hosoda
Department of Urban Management, Kyoto University, C1-3, Kyodai-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan

Abstract

The unsteady flow structures induced by Karman vortices and horseshoe vortices around a rectangular column are examined using 3-D numerical computations. The non-linear κ−ε model with the effect of the strain and rotation parameters is adopted as the turbulence model. Applicability of the turbulence model to the Karman vortex shedding in the 2-D flow field is firstly investigated through the comparison of the calculated results with the experimental ones conducted in the closed water section by Lyn (1992) and the model constants are adjusted. Then, the 3-D computations of unsteady flows in open channels are carried out focusing on the Karman vortex and the horseshoe vortex generated around a cylinder. Effects of the depth on the 3-D flow structures in open channels are also discussed through the comparison of the numerical results under the different conditions of water depth.