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Technical Briefs

Particle Image Velocimetry Measurements in the Wake of a Cactus-Shaped Cylinder

[+] Author and Article Information
Jack E. Abboud, Wafaa S. Karaki

Mechanical Engineering Department,  American University of Beirut, P.O. Box 11-0236, Beirut, Lebanon

Ghanem F. Oweis

Mechanical Engineering Department,  American University of Beirut, P.O. Box 11-0236, Beirut, Lebanongoweis@aub.edu.lb

J. Fluids Eng 133(9), 094502 (Sep 08, 2011) (3 pages) doi:10.1115/1.4004824 History: Received July 17, 2009; Revised February 24, 2011; Published September 08, 2011; Online September 08, 2011

The flow field past a biologically inspired cylindrical model with a cactus-shaped cross section is investigated in a wind tunnel using particle image velocimetry and surface pressure measurements at a biologically relevant Reynolds number of ∼ 2 × 105 . For the cactus model, the mean streamwise flow heals faster in its immediate wake, the wake turbulent velocity level is lower, and the surface static pressure has better recovery compared to the circular cylinder model.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 2

Vertical turbulent velocity fluctuations at x/D = 0.5 for Re 6.8 × 104 and 2.1 × 105 for the cactus and circular cylinders

Grahic Jump Location
Figure 3

Surface pressure coefficient (cP=P-P∞/12ρU∞2) measurements from the cactus model (gray continuous) and the circular model (black dashed) for Re ≈ 2.1 × 105

Grahic Jump Location
Figure 1

Mean streamwise velocity distribution in the cylinder’s wake as a function of downstream distance from the trailing edge (x/D) for the cactus (continuous line) and circular (dashed line) models for Re ≈ 2.1 × 105 . Inset: a depiction of the eight groove, 69 mm cactus cross section showing the coordinate system, and the incident flow at 0 deg (Θ=0).

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