Three-Dimensional Flow around a Bottom-Mounted Short Cylinder
Publication: Journal of Hydraulic Engineering
Volume 133, Issue 5
Abstract
The flow characteristics around short, bottom-mounted cylinders were examined with a three-dimensional nonhydrostatic model for Reynolds numbers of 300–3,900 and different obstacle geometries. Simulations using a large-eddy simulation closure scheme reproduce the vortex shedding in the wake, with reasonable Strouhal number comparisons to available laboratory data. The length of the recirculation region is also in good agreement with the data. The sensitivity of the flow to obstacle cross section and length is investigated for a Reynolds number of 500 with square and circular cylinder geometries for nondimensional lengths of 1–15. Model predicted upstream separation was found to be most sensitive to cross section. The predicted downstream recirculation lengths reproduced the nondimensional length dependency of available observations. To highlight the processes relevant to scour, the time-dependent bed shear was evaluated with the mean and peak Shields parameters. Significant wake variability was found which would not be described by the mean alone, indicating that sediment transport models assuming a mean shear will underpredict the transport in the wake.
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Acknowledgements
This study is funded partially by the Ohio State University College of Engineering and the Office of Naval Research–Mine Burial Project (Project No. N00014-00-1-0570). The writers would like to thank Dr. Firat Testik, Dr. Sergey Voropayev, and Dr. Joe Fernando for their generosity in sharing their laboratory data and insights.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 133 • Issue 5 • May 2007
Pages: 534 - 544
Copyright
© 2007 ASCE.
History
Received: Mar 29, 2005
Accepted: Jul 12, 2006
Published online: May 1, 2007
Published in print: May 2007
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