Quadrant Analysis of Turbulence in a Rectangular Cavity with Large Aspect Ratios
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 7
Abstract
By using particle image velocimetry techniques, this paper presents new insights on the turbulence structure and time-averaged flows in a rectangular cavity with large aspect ratios. The three cavity aspect ratios (, where = cavity length, = cavity depth) used in this study are 9.9, 13.0, and 18.9. The time-averaged velocity fields and Reynolds shear stress distributions within the cavity show that the flow pattern and turbulence structures are strongly affected by the cavity aspect ratio. The quadrant dynamic analysis of velocity fluctuations on the cavity shear layers and cavity downstream edge for the three cavities is conducted. Considering all of the bursting events with hole size parameter, in the measured planes, sweeps are found to have the highest probability of occurrence within the zone of the shear layer, and ejections dominate almost all of the areas within the cavity and a certain depth of flow immediately above the shear layer. For the high-magnitude events (), quadrant dominances are almost inverted for all of the measured planes. The quadrant shear stress distributions show that the opposing events are approximately balanced for these regions on the cavity shear layers and along the cavity downstream edge.
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Acknowledgments
The authors sincerely thank Dr. S. C. Hsieh for his significant contributions to the development of the PIV data processing algorithm. The NTU Research Scholarship provided by Nanyang Technological University to the second author is gratefully acknowledged. This research was supported by the Young Scientists Fund of the National Natural Science Foundation of China (51709082).
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Published In
Journal of Hydraulic Engineering
Volume 144 • Issue 7 • July 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 24, 2017
Accepted: Jan 4, 2018
Published online: Apr 30, 2018
Published in print: Jul 1, 2018
Discussion open until: Sep 30, 2018
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