Vortex shedding from a cylinder vibrating in line with an incident uniform flow

Griffin, O. M.; Ramberg, S. E.

doi:10.1017/s0022112076000207

Cited by 217 publications

(111 citation statements)

References 9 publications

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“…Others include, but are not limited to, transverse (cross-stream) oscillation, [1][2][3][4] rotational oscillation of the cylinder, [5][6][7][8] constant rotation of the cylinder, 9,10 and actuation by synthetic jets from the surface of the cylinder and base bleed. [11][12][13] Previous studies of streamwise forced oscillation [14][15][16][17] have investigated the synchronization between the forcing and the vortex shedding. These studies report that the vortex shedding locks to a subharmonic of the forcing (vortex shedding at half the frequency of the forcing), particularly for forcing frequencies around twice f so , the shedding frequency from the unperturbed cylinder.…”

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confidence: 99%

Streamwise forced oscillations of circular and square cylinders

et al. 2012

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The modification of a cylinder wake by streamwise oscillation of the cylinder at the vortex shedding frequency of the unperturbed cylinder is reported. Recent numerical simulations [J. S. Leontini, D. Lo Jacono, and M. C. Thompson, “A numerical study of an inline oscillating cylinder in a free stream,” J. Fluid Mech. 688, 551–568 (2011)10.1017/jfm.2011.403] showed that this forcing results in the primary frequency decreasing proportionally to the square of the forcing amplitude, before locking to a subharmonic at higher amplitudes. The experimental results presented here show that this behavior continues at higher Reynolds numbers, although the flow is three-dimensional. In addition, it is shown that this behavior persists when the body is a square cross section, and when the frequency of forcing is detuned from the unperturbed cylinder shedding frequency. The similarity of the results across Reynolds number, geometry, and frequency suggests that the physical mechanism is applicable to periodic forcing of the classic von Kármán vortex street, regardless of the details of the body which forms the street.

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confidence: 99%

Streamwise forced oscillations of circular and square cylinders

et al. 2012

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“…Some researchers have studied the flow past a cylinder subjected to forced oscillations, while others have looked at flow-induced vibrations. The interested reader is referred to the works by Toebes (1969), Griffin (1971), Tanida et al (1973), Griffin & Ramberg (1975), King (1977), Durgin et al (1980), Chen (1987), Williamson & Roshko (1988), Olinger & Sreenivasan (1988), Ongoren & Rockwell (1988a, b) and Blevins (1990). There have been fewer efforts using computational methods.…”

Section: Introductionmentioning

confidence: 99%

Flow-Induced Oscillations of Two Cylinders in Tandem and Staggered Arrangements

Mittal

Kumar

2001

Journal of Fluids and Structures

161

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A stabilized finite element formulation is employed to study flow-induced oscillations of a pair of equal-sized cylinders in tandem and staggered arrangement placed in uniform incompressible flow. Computations, restricted to 2-D, are carried out for Reynolds numbers 100 for various values of the structural frequency of the oscillator. The cylinders are separated by 5,5 times the cylinder diameter in the streamwise direction. For the staggered arrangement, the cross-flow spacing between the two cylinders is 0.7 times the cylinder diameter. In this arrangement, the downstream cylinder lies in the wake of the upstream one and therefore experiences an unsteady in-flow. Since the spacing between the two cylinders is beyond the critical value for proximity interference, it is expected that the upstream cylinder behaves like an isolated single cylinder, while the dQwnstream one experiences wake-induced flutter. The Re = 100 flow leads to a very organized wake and large amplitude motion is observed for the downstream cylinder. The trajectory of the upstream cylinder resembles a figure-of-eight. The downstream cylinder shows a similar behaviour for the tandem arrangement. However, for the staggered arrangement, the trajectory of the rear cylinder resembles a tilted oval. Soft lock-in is observed in almost all the cases.(g)

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“…Structural failure may result from synchronization between the fluid excitation force and the system natural frequency in the streamwise direction. Examples include the damage of piling during the construction of an oil terminal on the Humber estuary of England in the 1960s (Griffin & Ramberg 1976) and of a thermocouple in the fast breeder reactor Monju of the Japan Nuclear Cycle Development Institute in 1995 (Okajima et al 2004). The problem of streamwise oscillation could be particularly severe when a lightly damped cylindrical structure is used in liquids of high density such as water, oil and metal at high temperature.…”

Section: Introductionmentioning

confidence: 99%

“…an isolated cylinder case, one order of magnitude larger than the drag force (e.g. Griffin & Ramberg 1976;Chen 1987;Williamson & Roshko 1988;Staubli & Rockwell 1989;Griffin & Hall 1991;Carberry & Sheridan 2001). Subsequently the lateral structural oscillation prevails over that in the streamwise direction.…”

Section: Introductionmentioning

confidence: 99%

“…Tanida, Okajima & Watanabe (1973) measured the lift and drag force on a streamwise oscillating circular cylinder to study the stability of the oscillation of the cylinder at A/d = 0.14 and f e /f s = 0.5-2.2. Griffin & Ramberg (1976) visualized the vortex formation around a cylinder oscillating in line with the flow at the onset of 'lock-on'. They investigated f e /f s and A/d ranging from 1.74 to 2.2 and 0.06 to 0.12 (Re ≡ U ∞ d/ν = 190, where U ∞ is the free-stream velocity and ν is the fluid kinematic viscosity), respectively.…”

Section: Introductionmentioning

confidence: 99%

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A symmetric binary-vortex street behind a longitudinally oscillating cylinder

Zhou

Wang

2006

J. Fluid Mech.

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The wake of a streamwise oscillating circular cylinder has been experimentally investigated over a range of oscillation amplitude and frequency ratios using laserinduced-fluorescence flow visualization, particle image velocimetry and hot-wire techniques. Five typical flow structures, referred to as S-I, S-II, A-I, A-III and A-IV, are identified. Special attention is given to the S-II mode because this flow structure is observed experimentally for the first time. It consists of two rows of binary vortices symmetrically arranged about the centreline of the wake. Each binary vortex contains two counter-rotating vortices shed from the same side of the cylinder. This flow structure corresponds to zero mean and fluctuating lift on the cylinder, which could be of engineering significance. A theoretical analysis for this flow has been conducted based on the governing equations. The solution to the two-dimensional vorticity equation suggests that the flow may be considered to be the superposition of two components, i.e. that due to a stationary cylinder in a steady uniform cross-flow and to a cylinder oscillating in fluid at rest, which are characterized by alternate and symmetric vortex shedding, respectively. The solution provides insight into the formation of the various modes of the flow structure. A semi-empirical prediction of the S-II mode structure is developed, which is in excellent agreement with experimental data as well as with previous numerical results.

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Vortex shedding from a cylinder vibrating in line with an incident uniform flow

Cited by 217 publications

References 9 publications

Streamwise forced oscillations of circular and square cylinders

Streamwise forced oscillations of circular and square cylinders

Flow-Induced Oscillations of Two Cylinders in Tandem and Staggered Arrangements

A symmetric binary-vortex street behind a longitudinally oscillating cylinder

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