Turbulence Statistics in an Open-Channel Flow over a Rough Bed
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 11
Abstract
This paper presents the results of a large-eddy simulation (LES) of turbulent flow over a channel bed artificially roughened by hemispheres. The Reynolds number of the flow based on the channel depth is 13,680 at a relatively low submergence of 3.42. First- and second-order statistics are compared with corresponding laboratory experiments to validate the LES. The effect of roughness heterogeneity on higher-order statistics is quantified and discussed. The contribution of the dominating turbulent events (i.e., sweeps, ejections) to the Reynolds stress and the anisotropy of turbulence are quantified. Visualizations of the complex three-dimensional turbulence structures reveal the occurrence of a number of different vortex types in the flow. The contribution of turbulence structures to the turbulent kinetic energy and their scaling is assessed through proper orthogonal decomposition.
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Acknowledgments
The first author is supported by the National Science Foundation Award NSF#0738690. CPU time was granted by the Norwegian Metacenter for Computational Science (NOTUR), which is gratefully acknowledged. The simulations were carried out on the njord supercomputer at the Norwegian University of Science and Technology, Trondheim, Norway. The three anonymous reviewers are thanked for their comments and feedback, which helped improve the paper.
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Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 11 • November 2011
Pages: 1347 - 1358
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Aug 26, 2010
Accepted: May 10, 2011
Published online: Jul 11, 2011
Published in print: Nov 1, 2011
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