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Dec 31, 2015
Oscillatory Boundary Layer Flow Over Rippled Beds
Authors: Shinji Sato, Nobuo Mimura, and Akira WatanabeAuthor Affiliations
Publication: Coastal Engineering 1984
Abstract
Characteristics of the oscillatory boundary layer flow above rippled beds were investigated through experiments and numerical calculations. Experiments were conducted in an oscillatory flow tunnel. Velocities above symmetric and asymmetric ripples were measured with split-hot-film sensors under conditions of both sinusoidal and asymmetric oscillations. The stress field in the boundary layer was evaluated based on the distributions of the measured velocity and Reynolds stress. Relations between vortex formation and turbulence were examined, and effects of the asymmetry of oscillatory main flow and of ripple form on the velocity field were discussed. Numerical calculations were carried out by integrating the Navier-Stokes equations with an implicit finite difference scheme. Formation of a lee vortex above ripples was simulated in the calculations. The bottom shear stress and the energy dissipation rate were estimated based on the results of the experiments and calculations.
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© 1985 American Society of Civil Engineers.
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Published online: Dec 31, 2015
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Shinji Sato
Research Associate, Dept. of Civil Eng., Univ. of Tokyo, Bunkyo-ku, Tokyo, 113 JAPAN
Nobuo Mimura
Associate Professor, Dept. of Civil Eng., Ibaraki Univ., Hitachi, Ibaraki, 316 JAPAN
Akira Watanabe
Professor, Dept. of Civil Eng., Univ. of Tokyo, Bunkyo-ku, Tokyo, 113 JAPAN
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