Characteristics of Steady Horseshoe Vortex System near Junction of Square Cylinder and Base Plate
Publication: Journal of Engineering Mechanics
Volume 134, Issue 2
Abstract
This paper presents an experimental investigation on the characteristics of a horseshoe vortex system near the juncture of a square cylinder and a horizontal base plate, using particle image velocimetry and flow visualization technique. Experiments were conducted for Reynolds numbers (based on the free stream velocity and the width of square cylinder) ranging from to . The flow patterns are first classified into four major regimes: Steady horseshoe vortex system, periodic oscillation vortex system with small displacement, periodic breakaway vortex system, and irregular vortex system. The classifications can be demonstrated as a figure of Reynolds number versus the ratio of the height of square cylinder to undisturbed boundary layer thickness. The study then mainly focused on the characteristics of steady horseshoe vortex system (corresponding to Reynolds numbers ranging from to ). The nondimensional characteristics, including the horizontal and vertical distances from the primary vortex core to frontal face of the vertical square cylinder and bottom boundary of the base plate, respectively, the height of stagnation point at frontal face of the square cylinder, and the down-flow discharge as well as circulation of the primary vortex, all increase with increase of the ratio of the height of square cylinder to undisturbed boundary layer thickness. However, they all decrease with the increase of the aspect ratio (i.e., the height-to-width ratio) of the square cylinder. The study provides essential properties of a steady horseshoe vortex system and gives an insight for related engineering applications. It can be served as a basis for more complicated horseshoe vortex systems occurring at high Reynolds numbers.
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Acknowledgments
The writers gratefully acknowledge the financial support of the National Science Council of Taiwan under Grant Nos. NSCTNSC93-2611-E-005-002 and NSCTNSC94-2611-E-005-002, and the Directorate General of the Highways Bureau, Ministry of Transportation and Communication of Taiwan, to the National Chung-Hsing University.
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© 2008 ASCE.
History
Received: May 22, 2006
Accepted: Jun 15, 2007
Published online: Feb 1, 2008
Published in print: Feb 2008
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Note. Associate Editor: Brett F. Sanders
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