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NUMERICAL STUDIES OF OPEN CHANNEL FLOWS AROUND INCLINED SPUR DIKES BY MEANS OF A NON-LINEAR k−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

Shinichiro Onda
Graduate School of Civil Engineering, Kyoto University Yoshida Sakyo-ku, Kyoto 606-850 I, Japan

Akihiro Tominaga
Department of Architecture and Civil Engineering, Nagoya Institute of Technology, Gokiso-cho Showa-ku, Nagoya 466-8555, Japan

Resumo

Characteristics of 3D turbulent flow features around inclined submerged spur dikes are numerically investigated using a non-linear k−ε model. A generalized curvilinear movable coordinate is employed to calculate the free surface oscillation and take into account the complex topography. The computations were performed under the conditions of the laboratory tests with PIV measurements performed by Tominaga et al (2001). Numerical results show that the amplitude of fluid oscillation around downstream inclined spur dikes is much larger than that around downstream inclined ones and the period of the oscillation is in compatible with the first mode of impinging shear layer.