Vortices and Large-Scale Structures in a Rough Open-Channel Flow Subjected to Bed Suction and Injection
Publication: Journal of Engineering Mechanics
Volume 138, Issue 5
Abstract
The effect of seepage (injection and suction) on the dynamics of vortices and large-scale structures in a rough open channel flow was examined experimentally. The velocity measurements in the open channel flow were carried out using particle image velocimetry. A swirling strength-based vortex identification algorithm was used to extract the location, size, and strength of vortices in the flow. Proper orthogonal decomposition (POD) was used to analyze the dynamics of large-scale structures in the flow. The results indicate that suction induces a greater change compared with an equivalent amount of injection on the open channel flow. Suction dampens the size and strength of the vortices compared to the no-seepage case. POD analysis indicates that seepage tends to introduce more small-scale structures in the flow and destroys the large-scale organized motion present otherwise in the flow.
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Acknowledgments
The authors would like to thank the Natural Sciences and Engineering Research Council of Canada (NSERC) for the support to the senior author via a Discovery Grant program.
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Information
Published In
Journal of Engineering Mechanics
Volume 138 • Issue 5 • May 2012
Pages: 491 - 501
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Dec 31, 2010
Accepted: Nov 16, 2011
Published online: Nov 18, 2011
Published in print: May 1, 2012
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