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Research Papers: Flows in Complex Systems

The Effect of Free Surface on the Vortex Shedding From Inclined Circular Cylinders

[+] Author and Article Information
P. P. Vlachos

Mechanical Engineering Department,  Virginia Tech, Blacksburg, VA 24061

D. P. Telionis

Engineering Science and Mechanics Department,  Virginia Tech, Blacksburg, VA 24061

J. Fluids Eng 130(2), 021103 (Jan 24, 2008) (9 pages) doi:10.1115/1.2829578 History: Received February 08, 2007; Revised July 01, 2007; Published January 24, 2008

Spectral analysis of laser Doppler velocimetry measurements and flow visualization are employed to study the wake of inclined cylinders piercing a free surface. The results indicate that the free surface affects vortex shedding almost two to three cylinder diameters below the free surface. Variation of the vortex axis inclination and cells of shedding were visually observed. These effects induce a phase difference in the vortex-shedding mechanism. Streamwise vortical structures are formed along the primary vortex axis. Furthermore, for the case of the highest Froude number, evidence is provided that vortex shedding is suppressed in the region near the free surface.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Inclination of the cylinder with respect to the free-stream velocity. This is a side view of the experimental setup. The flow is depicted from right to left, to be consistent with the flow visualizations.

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Figure 2

Schematic representation of the position of the hydrogen-bubble wire and the fiber-optic LDV probe with respect to the cylinder axis. This sketch represents a cut normal to the z axis of Fig. 1, i.e., a top view of the experimental setup. Here, the flow is from left to right. (All dimensions are in mm)

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Figure 3

Hydrogen bubbles. (a) Inclination a=0deg, Fr=0.3; (b) inclination a=0deg, Fr=0.3; (c) inclination a=0deg, Fr=0.3; (d) inclination a=0deg, Fr=0.65; (e) inclination a=0deg, Fr=0.65; (f) inclination a=0deg, Fr=0.65; (g) inclination a=0deg, Fr=1.06; (h) inclination a=0deg, Fr=1.06; and (i) inclination a=0deg, Fr=1.06.

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Figure 4

Hydrogen bubbles. (a) Inclination a=30deg, Fr=0.3; (b) inclination a=30deg, Fr=0.3; (c) inclination a=30deg, Fr=0.3; (d) inclination a=30deg, Fr=0.65; (e) inclination a=30deg, Fr=0.65; (f) inclination a=30deg, Fr=0.65; (g) inclination a=30deg, Fr=1.06; (h) inclination a=30deg, Fr=1.06; (i) inclination a=30deg, Fr=1.06.

Grahic Jump Location
Figure 5

Hydrogen bubbles. (a) Inclination a=−30deg, Fr=0.3; (b) inclination a=−30deg, Fr=0.3; (c) inclination a=−30deg, Fr=0.3; (d) inclination a=−30deg, Fr=0.65; (e) inclination a=−30deg, Fr=0.65; (f) inclination a=−30deg, Fr=0.65; (g) inclination a=−30deg, Fr=1.06; (h) inclination a=−30deg, Fr=1.06; and (i) inclination a=−30deg, Fr=1.06.

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Figure 6

Particle visualization. (a) a=0deg, Fr=0.3; (b) a=30deg, Fr=0.3; (c) a=−30deg, Fr=0.3; (d) a=0deg, Fr=0.65; (e) a=30deg, Fr=0.65; (f) a=−30deg, Fr=0.65; (g) a=0deg, Fr=1.06; (h) a=30deg, Fr=1.06; and (i) a=−30deg, Fr=1.06

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Figure 7

Power spectra contours as a function of the elevation. (a) Inclination a=0deg, Fr=0.3; (b) inclination a=30deg, Fr=0.3; (c) inclination a=−30deg, Fr=03; (d) inclination a=0deg, Fr=0.65; (e) inclination a=30deg, Fr=0.65; (f) inclination a=−30deg, Fr=0.65; (g) inclination a=0deg, Fr=1.06; (h) inclination a=30deg, Fr=Fr=1.06; and (i) inclination a=−30deg, Re=Fr=1.06.

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