Research Papers: Fundamental Issues and Canonical Flows

Experimental Investigation of Vortex-Induced Vibration in One and Two Dimensions With Variable Mass, Damping, and Reynolds Number

[+] Author and Article Information
Robert D. Blevins

 Goodrich, 850 Lagoon Drive, Chula Vista, CA 91910

Charles S. Coughran

 Scripps Institution of Oceanography, 9500 Gilman Drive, La Jolla, CA 92093

J. Fluids Eng 131(10), 101202 (Sep 30, 2009) (7 pages) doi:10.1115/1.3222904 History: Received May 20, 2008; Revised July 26, 2009; Published September 30, 2009

Measurements are made of vortex-induced vibration of an elastically supported circular cylinder in water with reduced velocity (U/fnD) from 2 to 12, damping factors (ζ) from 0.2% to 40% of critical damping, mass ratios (m/ρD2) from π/2 to π/17, and transverse, inline, and combined inline and transverse motions at Reynolds numbers up to 150,000. Effects of mass, damping, Reynolds number, and strakes on vortex-induced vibration amplitude, frequency, entrainment, and drag are reported.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

Test cylinder and experimental apparatus. Y is out of plane.

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Figure 2

One-dimensional transverse-only motion amplitude, frequency, and drag for six levels of damping, m/ρD2=5.02 and D=6.35 cm

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Figure 3

Transverse cylinder response for four cylinder masses at constant reduced damping, 2m(2πζ)/ρD2=1.24

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Figure 4

Time histories of vortex-induced cylinder motion. One degree-of-freedom transverse motion: (a) U/fnD=11.52, ζ=0.002, (b) U/fnD=6.15, ζ=0.05, (c) U/fnD=6.15, ζ=0.02, and (d) two degrees-of-freedom U/fnD=8.25, ζ=0.02.

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Figure 5

Amplitude of transverse cylinder response as a function of Reynolds number. m/ρD2=5.02, ζ=0.02 m, and 2m(2πζ)/ρD2=1.24. Surface roughness/cylinder diameter=0.00001 solid symbols and 0.005 open symbols.

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Figure 6

One degree-of-freedom inline only motion parallel to the freestream flow. Amplitude and frequency as a function of damping, m/ρD2=3.27.

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Figure 7

Two degrees-of-freedom inline (Ax) and transverse (Ay) amplitudes, frequency and drag coefficient (CD) for six levels of damping. m/ρD2=5.02. Dashed lines are jump in Fig. 4.

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Figure 8

Two degree-of-freedom X−Y orbits of transverse and inline motion. Velocity increases from left to right, 2m(2πζ)/ρD2=1.24

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Figure 9

Transverse cylinder response with two degree-of-freedom motion for four cylinder masses at constant reduced damping, 2m(2πζ)/ρD2=1.24. Compare with Fig. 3.

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Figure 10

Response of straked cylinders, m/ρD2=4.4, ζ=0.002

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Figure 11

Annotated two-dimensional motion showing regimes of inline, transverse, and figure 8 motion. ζ=0.02, m/ρD2=5.02. See orbits in Fig. 8. fs is stationary cylinder shedding frequency and fn is cylinder natural frequency in still water.



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