Hydrodynamic Behavior of Asymmetric Oscillatory Boundary Layers at Low Reynolds Numbers
Publication: Journal of Hydraulic Engineering
Volume 132, Issue 10
Abstract
An experimental and numerical study has been carried out to study the wave boundary layers under asymmetric waves. The experiments were conducted in an oscillating tunnel using a simple mechanical system to generate an asymmetric oscillatory motion similar to cnoidal waves. The velocities were measured by laser Doppler velocimetry and the bottom shear stress was calculated from the cross-stream velocity profile. A low Reynolds number model was used to predict the hydrodynamic properties of the cnoidal wave boundary layers. After validating the model with the experimental data, a series of numerical experiments were carried out to study the transitional behavior of these boundary layers by virtue of friction factor and phase difference between mean free-stream velocity and bottom shear stress. Finally a stability diagram was drawn to demarcate the laminar, transition, and fully turbulent regimes using the numerical results. The present study would be useful for the hydraulic and coastal engineers interested in calculating bottom shear stress in order to compute the sediment transport in coastal environments.
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Acknowledgments
A part of this study was completed when the first writer was on research leave from Sultan Qaboos University, Oman to stay in Japan as Japan Society for the Promotion of Science (JSPS) fellow at Tohoku University, Sendai. The first writer is grateful for the support provided by JSPS, Tohoku University, and Sultan Qaboos University.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 132 • Issue 10 • October 2006
Pages: 1086 - 1096
Copyright
© 2006 ASCE.
History
Received: Jul 29, 2003
Accepted: Jun 1, 2005
Published online: Oct 1, 2006
Published in print: Oct 2006
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