Turbulent Flow over a Channel with Fluid-Saturated Porous Bed
Publication: Journal of Hydraulic Engineering
Volume 133, Issue 6
Abstract
The characteristics of fully developed turbulent flow in a hybrid domain channel, which consists of a clear fluid region and a porous bed, are examined numerically using a model based on the macroscopic Reynolds-averaged Navier–Stokes equations. By adopting the classical continuity interface conditions, the present model treats the hybrid domain problem with a single domain approach, and the simulated results are noted to coincide with the existing experimental data and microscopic data. The effects of porosity and Darcy number on the flow properties over and inside the porous bed are further investigated in the selected ranges of , and . It has been demonstrated that the presence of the porous bed causes the significant reduction of the flow velocities inside the clear fluid region relative to that of a smooth impermeable bed, and also reduces the magnitude of the integral constant of the velocity logarithmic distributions from its traditional value 5.25. Moreover, turbulent shear stress within the upper part of the porous bed increases significantly with the porosity and Darcy number . The thickness of turbulence penetration remains proportional to the values of porosity and Darcy number .
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Acknowledgments
The National Science Council, Taiwan, financially supported this study under Grant No. NSC 92-2211-E-006-031. The writers gratefully acknowledge Dr. A. Sau (Cheng-Kung University) for his writing comment. The writers would also like to thank all of the referees for providing their helpful and constructive comments.
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 133 • Issue 6 • June 2007
Pages: 610 - 617
Copyright
© 2007 ASCE.
History
Received: Oct 4, 2004
Accepted: Sep 25, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
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