Vortex-induced oscillation of bluff cylinders

Komatsu, Sadao; Kobayashi, Hiroshi

doi:10.1016/0167-6105(80)90010-0

Cited by 73 publications

(29 citation statements)

References 3 publications

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“…oscillation cycles. These conclusions are supported by the results of Komatsu & Kobayashi (1980). They plotted the development of the vortex pattern and pressure distribution along a rectangular cylinder in cross-flow undergoing oscillations at a velocity slightly higher than the critical velocity value.…”

Section: Introductionsupporting

confidence: 64%

Fluid–structure interaction-induced oscillation of flexible structures in laminar and turbulent flows

Gomes

Lienhart

2013

J. Fluid Mech.

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Self-excitation of the motion of a structure has become a prominent aspect of engineering projects over recent years as designers are using materials at their limits, causing structures to become progressively lighter, more flexible and, therefore, prone to vibrate. Stimulated by the increasing interest in fluid-structure interaction (FSI) problems, this study investigated the instability and consequent FSI-induced self-excited oscillation of flexible structures in uniform flows at Reynolds numbers between 10 and 1.69 × 10 5 . The investigations were performed in both water and a highly viscous syrup (ν = 1.64 × 10 −4 m 2 s −1 ) and considered three structures of different geometries. The results were conclusive in showing that the motion of the structure was characterized by a sequence of oscillation modes as a function of the characteristics of the structure and flow properties. In addition, it was possible to identify the self-excitation mechanisms as being of the instability-induced excitation (IIE) or movement-induced excitation (MIE) types. IIE was observed to be the most dominant mechanism of excitation at lower velocities and it was defined by a direct relation between the flow fluctuation and natural frequencies of the structure. For that reason, IIE was strongly determined by the geometry of the front body of the structure. At higher velocities, the amplitudes of the flow disturbances generated by the structure movement increased and excitations of the MIE type became predominant for all structures. The MIE mechanism was found to be weakly influenced by the shape of the structure but very sensitive to its dynamic characteristics and to the properties of the fluid, especially the Reynolds number.

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Section: Introductionsupporting

confidence: 64%

Fluid–structure interaction-induced oscillation of flexible structures in laminar and turbulent flows

Gomes

Lienhart

2013

J. Fluid Mech.

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“…(Komatsu and Kobayashi, 1980). (Komatsu and Kobayashi, 1980). This modified Strouhal number accurately predicts the free stream wind velocity at which cross-flow vibrations occur for fundamental structural bluff bodies (Matsumoto, 1999).…”

Section: Impinging Leading-edge Vorticesmentioning

confidence: 81%

“…For specific velocities dependent on the aspect ratio, they found that, while no spontaneous oscillation occurs if the cylinder is initially at rest, an initial amplitude could trigger sustained oscillation. Komatsu and Kobayashi, 1980 reported that V r , C r did not coincide with the velocity producing the maximum amplitudes of oscillation.…”

Section: Impinging Leading-edge Vorticesmentioning

confidence: 96%

“…Komatsu and Kobayashi (1980), conducted wind tunnel experiments with elastically supported rectangular cylinders with aspect ratios that ranged from 2 < L/D < 5. The cylinders were suspended in a smooth air flow at zero angle of attack and constrained to only cross-flow motion.…”

Section: Impinging Leading-edge Vorticesmentioning

confidence: 99%

“…As shown, the peak amplitudes for the elastically supported rectangular cylinders tend to two common straight lines, whereas the V r>cr curve exhibits the variation of Strouhal number, derived for stationary cylinders, relative to each aspect ratio. (Komatsu and Kobayashi, 1980). (Komatsu and Kobayashi, 1980).…”

Section: Impinging Leading-edge Vorticesmentioning

confidence: 99%

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