Suppression of wake-induced vibration of tandem cylinders with free-to-rotate control plates

Assi, Gustavo R. S.; Bearman, P. W.; Kitney, Neil; Tognarelli, Michael A.

doi:10.1016/j.jfluidstructs.2010.08.004

Cited by 84 publications

(21 citation statements)

References 20 publications

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“…The 1-dof rig has been employed for several VIV experiments and is described in detail in Assi et al (2010a). For brevity, we will limit ourselves to comment that the 1-dof rig consisted of a rigid support table, mounted on two carbon fibre tubes, sliding through air bearings in the cross-flow direction.…”

Section: Experimental Arrangementmentioning

confidence: 99%

“…In addition to the short-tail fairing, two splitter plates of length L/D¼ 0.5 and 1.0 were tested in the 1-dof rig (cross-flow direction only). Responses are compared against the typical VIV response of a plain cylinder with 1-dof from Assi et al (2010a).…”

Section: Fixed Suppressors In 1-dofmentioning

confidence: 99%

“…The same was verified for free-to-rotate suppressors composed of two parallel plates (Assi et al, 2012), revealing that a minimum rotational resistance is necessary to stabilise the devices. Assi et al (2009Assi et al ( , 2010a have also shown that 1D-long parallel plates can be very efficient in suppressing both VIV and WIV (wakeinduced vibration). WIV occurs when the downstream body of a set is excited by the unsteady wake generated from another body placed upstream (Assi et al, 2010b(Assi et al, , 2013a.…”

Section: Introductionmentioning

confidence: 99%

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On the stability of a free-to-rotate short-tail fairing and a splitter plate as suppressors of vortex-induced vibration

2014

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Section: Experimental Arrangementmentioning

confidence: 99%

Section: Fixed Suppressors In 1-dofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the stability of a free-to-rotate short-tail fairing and a splitter plate as suppressors of vortex-induced vibration

2014

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“…The springs were set to provide the same natural frequency ( f 0 ) in both the cross-flow and streamwise directions. The design and construction of the pendular elastic rig was made by Freire et al [3] based on a previous idea employed by Assi et al [4,5] for experiments with VIV suppressors. The present apparatus has been validated for VIV experiments by Freire at al.…”

Section: Experimental Arrangementmentioning

confidence: 99%

Experimental Investigation of the Vortex-Induced Vibration of a Curved Cylinder

Assi

Srinil

Freire

et al. 2012

Volume 5: Ocean Engineering; CFD and VIV

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Experiments have been conducted in a water channel in order to investigate the vortex-induced vibration (VIV) response of a rigid section of a curved circular cylinder. Two curved configurations were tested regarding the direction of the approaching flow, a concave or a convex cylinder, in addition to a straight cylinder that served as reference. Amplitude and frequency response are presented versus reduced velocity for a wide Reynolds number range between 750 and 15,000. Trajectories in the cross-flow and streamwise direction are presented as well for several reduced velocities. Results show a distinct behaviour from the typical VIV of a straight cylinder highlighting the effect of curvature on vortex formation and excitation. The concave configuration presents relatively high amplitudes of vibration that are sustained beyond the typical synchronisation region. The mechanism behind the response is not yet clear, although authors suggest it might be related to some kind of buffeting excitation due to the disturbed flow from *

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“…The situation is of practical interest in many engineering applications as chimney stacks, long-span bridges, marine structures, tall buildings and towers etc. and has been steadily investigated by the researchers Bearman, [1,2,3,4,5]; Matsumato [6]; Williamson [7]; Williamson and Govardhan, [8,9]. In order to reduce or eliminate the adverse effects of vortex-induced vibrations (VIV), it is inevitably important to control the flow structure around the bluff body and/or alter the mechanical properties of the material used in terms of damping and natural frequency.…”

Section: Introductionmentioning

confidence: 99%

The effects of perforated cylinders on the vortex shedding on the suppression of a circular cylinder

et al. 2017

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Abstract. The aim of this study is the control of unsteady vortical flow occurred downstream of a circular cylinder located in shallow water flow using concentrically located outer perforated cylinder. The porosities, ȕ have been changed between 0.1 and 0.8 in the present study. The increments of porosity ȕ were taken as 0.05 in the range of 0.1 and 0.8 with a hole diameter of d=10 mm. The ratio of inner cylinder diameter to outer cylinder diameter, D i /D o was selected as 0.25, 0.3, 0.4, 0.5 and 0.6 the inner cylinder diameter is D i =50mm where the outer cylinder diameter is D d =100mm. Experiments were performed at a constant depth of the water level as h=50mm (half of the outer cylinder diameter). Free stream velocity was taken as U =100 mm/s corresponding to a Reynolds number of Re D o =10000 based on the outer cylinder diameter. It has been observed that the inner circular cylinder was highly affected by the existence of surrounding outer perforated cylinders. It is observed that the intensity of Reynolds shear stress correlating, is completely attenuated in the region both downstream of concentric cylinder and between the concentric cylinders. It is determined from the experiments that porosity, ȕ=0.55 is the most effective parameter for control of flow structure that is occurred from the inner cylinder.

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Suppression of wake-induced vibration of tandem cylinders with free-to-rotate control plates

Cited by 84 publications

References 20 publications

On the stability of a free-to-rotate short-tail fairing and a splitter plate as suppressors of vortex-induced vibration

On the stability of a free-to-rotate short-tail fairing and a splitter plate as suppressors of vortex-induced vibration

Experimental Investigation of the Vortex-Induced Vibration of a Curved Cylinder

The effects of perforated cylinders on the vortex shedding on the suppression of a circular cylinder

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