Calculations of Nonsubmerged Groin Flow in a Shallow Open Channel by Large-Eddy Simulation
Publication: Journal of Engineering Mechanics
Volume 140, Issue 5
Abstract
Rigid structures, such as groins or spur dikes, are constructed along riverbanks for various purposes, which pose computational challenges for unsteady flow in engineering mechanics. This paper presents a study of turbulent flow past a series of groins in a shallow, open channel by large-eddy simulation (LES). A direct-forcing immersed boundary method (IBM) was implemented to approximate complex boundaries around groins with round heads. The time-averaged velocities and turbulence intensities at the water surface obtained by an experiment using particle image velocimetry (PIV) were employed to validate the LES model, finding a satisfactory agreement between laboratory data and model results. Subsequently, the numerical model was employed to investigate the impact of groin parameters (i.e., head shape, aspect ratio , and length ) on the flow properties. Model results showed that a rectangular-headed groin generates higher turbulence intensities and larger vortices than a round-headed groin. On the other hand, the groin aspect ratio () affects the strength of turbulence intensities, vorticity in the mixing layer, and flow patterns in the groin field. Consistent with previous studies, the groin length () significantly affected the turbulent intensities and the vorticity but had little influence on the streamline in the recirculation zone. Eddies were produced at the groin tips and transported downstream. The shape of the vortex group varied as the vortices were transported downstream by the flow. Coherent structures were visualized by -criterion around the groin tips.
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Acknowledgments
This work was funded by the Natural Science Foundation for the Youth (No. 10902061). The computations were supported by Tsinghua High-performance Computing Center (THPCC). The authors are grateful to Professor W. Rodi for granting the CFD group at Tsinghua University access to the LESSOC2 code.
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Published In
Journal of Engineering Mechanics
Volume 140 • Issue 5 • May 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Sep 7, 2012
Accepted: Sep 18, 2013
Published online: Sep 20, 2013
Published in print: May 1, 2014
Discussion open until: Jun 14, 2014
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