Flow-induced streamwise oscillation of two circular cylinders in tandem arrangement

Okajima, Atsushi; Yasui, Satoru; Kiwata, Takahiro

doi:10.1016/j.ijheatfluidflow.2007.04.015

Cited by 28 publications

(12 citation statements)

References 11 publications

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“…This aspect ratio is smaller than the minimum aspect ratio 10 corresponding to an infinite cylinder (e.g., West and Apelt, 1993). In FIV of two-dimensional model, a smaller aspect-ratio cylinder is chosen to avoid bending and pitching motions of the cylinder (e.g., Okajima et al, 1999Okajima et al, , 2007Hover et al, 2004;Takai and Sakamoto, 2006;Pan et al, 2007) capturing the essential features of the cross-flow vibration phenomenon. A cylinder vibration gives rise to a high degree of spanwise correlation, producing nearly two-dimensional flow on the cylinder (Griffin, 1980).…”

Section: Methodsmentioning

confidence: 99%

Characteristics and suppression of flow-induced vibrations of two side-by-side circular cylinders

Kim

Alam

2015

Journal of Fluids and Structures

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Section: Methodsmentioning

confidence: 99%

Characteristics and suppression of flow-induced vibrations of two side-by-side circular cylinders

Kim

Alam

2015

Journal of Fluids and Structures

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“…On the other hand, the standard deviation X 1sd of the in-line amplitude measured by Okajima et al (2007) at the spacing S/D = 3 are plotted in Figure 7 in order to compare with our numerical results. In the experiment by Okajima et al, the mass ratio χ = 160 was adopted for the in-line oscillations of the upstream cylinder in two tandem circular cylinders which are arranged at the spacing of S/D=1.3 to 4.0.…”

Section: Flow-induced Vibrations Of Anmentioning

confidence: 97%

“…For flow-induced vibrations of two circular cylinders, Okajima et al (2007) showed experimental results for inline vibrations of an upstream circular cylinder or a downstream circular cylinder in two tandem circular cylinders which were placed at various spacings. Brika and Laneville (1997) showed experimental results for vortex-induced vibrations of two flexible cylinders which were placed at long spacing.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional computation for flow-induced vibrations of an upstream circular cylinder in two tandem circular cylinders

Kondo

2014

International Journal of Computational Fluid Dynamics

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It is well known from a lot of experimental data that fluid forces acting on two tandem circular cylinders are quite different from those acting on a single circular cylinder. Therefore, we first present numerical results for fluid forces acting on two tandem circular cylinders, which are mounted at various spacings in a smooth flow, and second we present numerical results for flow-induced vibrations of the upstream circular cylinder in the tandem arrangement. The two circular cylinders are arranged at close spacing in a flow field. The upstream circular cylinder is elastically placed by damper-spring systems and moves in both the in-line and cross-flow directions. In such models, each circular cylinder is assumed as a rigid body. On the other hand, we do not introduce a turbulent model such as the Large Eddy Simulation (LES) or Reynolds Averaged Navier-Stokes (RANS) models into the numerical scheme to compute the fluid flow. Our numerical procedure to capture the flow-induced vibration phenomena of the upstream circular cylinder is treated as a fluid-structure interaction problem in which the ideas of weak coupling is taken into consideration.

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“…Tanida et al (1973) measured the lift and drag forces on the two cylinders when the downstream one oscillates streamwisely at A/d = 0.14 and f e /f s = 0.5 ∼ 2.2. Okajima et al (2007) focused on the flow-induced vibration of two tandem cylinders and also showed different excitation regions determined by the reduced velocity and the spacing between the cylinders, L/d. In addition, Bearman (2011) provided useful reviews of some recent experimental works in this flow category together with some other recent works (Assi et al , 2010;Huera-Huarte & Bearman, 2011) focusing on the near wake interactions, although in these works the oscillation is induced by the flows rather than forced.…”

Section: Introductionmentioning

confidence: 99%

Flow interaction between a streamwise oscillating cylinder and a downstream stationary cylinder

Gan

Zhou

2016

Exp Fluids

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Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Flow interaction between a streamwise oscillating cylinder and a downstream stationary cylinderReceived: date / Accepted: dateAbstract In this paper we present some experimental results about the physical effects of a cylinder's streamwise oscillation motion on a downstream one in a tandem arrangement. The upstream cylinder undergoes a controlled simple harmonic oscillation at amplitudes A/d = 0.2 ∼ 0.8, where d is the cylinder diameter, and the frequency ratio of f e /f s = 0 ∼ 3.0, where f e is the cylinder oscillation frequency and f s is the natural frequency of vortex shedding from a single stationary cylinder. Under these conditions, the vortex shedding is locked to the controlled oscillation motion. Flow visualization using the planar laser-induced fluorescence (LIF) and qualitative measurements using hot-wire anemometry (HWA) reveal three distinct flow regimes behind the downstream cylinder. For f e /f s > (f e /f s ) c , where (f e /f s ) c is a critical frequency ratio which depends on A/d and Reynolds number Re, a so called SA-mode occurs. The upstream oscillating cylinder generates binary vortices symmetrically arranged about the centreline, each containing a pair of counterrotating vortices, and the downstream cylinder sheds vortices alternately at 0.5f e . For 0.7 ∼ 1.0 < f e /f s < (f e /f s ) c a complex vortex street that consists of two outer rows of vortices generated by the oscillating cylin- der and two inner rows of vortices shed from the downstream stationary cylinder, which is referred to as AAmode. For 0.3 ∼ 0.6 < f e /f s < 0.8 ∼ 1.0, one single staggered vortex street (A-mode) is observed. It also is found that, when f e /f s is near unity, the streamwise interaction of the two cylinders gives rise to the most energetic wake in the corss-stream direction, in terms of its maximum width, and the wake is AA-mode like. The effects of other parameters such as the spacing between the two cylinders, Re and A/d on the flow pattern are also discussed in details. The observations are further compared to the stationary tandem cylinder cases.

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Flow-induced streamwise oscillation of two circular cylinders in tandem arrangement

Cited by 28 publications

References 11 publications

Characteristics and suppression of flow-induced vibrations of two side-by-side circular cylinders

Characteristics and suppression of flow-induced vibrations of two side-by-side circular cylinders

Three-dimensional computation for flow-induced vibrations of an upstream circular cylinder in two tandem circular cylinders

Flow interaction between a streamwise oscillating cylinder and a downstream stationary cylinder

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