Regenerative semi-active vortex-induced vibration control of elastic circular cylinder considering the effects of capacitance value and control parameters

Rabiee, Amir Hossein

doi:10.1007/s12206-018-1104-x

Cited by 9 publications

(2 citation statements)

References 33 publications

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“…From one perspective, flow control techniques are divided into passive and active methods (Kumar et al, 2008;Rabiee, 2018). There are several active flow control methods, including boundary layer control, plasma, rotating cylinders, and suction-blowing flow control that can reduce/suppress FIV by modifying the wake behind the structure…”

Section: Introductionmentioning

confidence: 99%

Transverse FIV suppression of square cylinder using two control rods of varying size and distance in lock-in and galloping regions

Farahani

Rabiee

2021

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Purpose) In this study, for the first time, the efficacy of control rods for full suppression of vortex-induced vibrations (VIV) and galloping of an elastically supported rigid square cylinder that vibrates freely in the cross-flow direction is investigated. Design/methodology/approach To this aim, two small control rods are placed at constant angles of ± 45° relative to the horizontal axis and then the influence of diameter and spacing ratios on the oscillation and hydrodynamic response along with the vortex structure behind the cylinder is evaluated in the form of nine different cases in both VIV and galloping regions. Findings The performed simulations show that using the configuration presented in this study results in full VIV suppression for the spacing ratios G/D = 0.5, 1 and 1.5 at the diameter ratios d/D = 0.1, 0.2 and 0.3 (D: diameter of square cylinder, G: distance between rods and cylinder, d: diameter of rods). On the contrary, a perfect attenuation of galloping is only achieved at the largest diameter (d/D = 0.3) and the smallest spacing ratio (G/D = 0.5). In general, for both VIV and galloping regions, with increasing diameter ratio and decreasing spacing ratio, the effect of the control rods wake in the vortex street of square cylinder gradually increases. This trend carries on to the point where the vortex shedding is completely suppressed and only the symmetric wake of control rods is observed. Originality/value So far, the effect of rod control on VIV of a square cylinder and its amplitude of oscillations has not been investigated.

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Section: Introductionmentioning

confidence: 99%

Transverse FIV suppression of square cylinder using two control rods of varying size and distance in lock-in and galloping regions

Farahani

Rabiee

2021

HFF

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“…As a result, the oscillating body begins high-amplitude vibrations that are bound to serious phenomena including acoustical noise and structural failure. Previous research on this subject reveals the promising potential of different control strategies to tackle this issue (Rabiee, 2018; Liu et al , 2019). In particular, active control methods used in reducing the FIV of elastically mounted circular cylinders are generally divided into two categories of open loop and closed-loop systems.…”

Section: Introductionmentioning

confidence: 99%

The effect of externally applied rotational oscillations on FIV characteristics of tandem circular cylinders for different spacing ratios

Rabiee

Esmaeili

2020

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Purpose This study aims to explore an active control strategy for attenuation of in-line and transverse flow-induced vibration (FIV) of two tandem-arranged circular cylinders. Design/methodology/approach The control system is based on the rotary oscillation of cylinders around their axis, which acts according to the lift coefficient feedback signal. The fluid-solid interaction simulations are performed for two velocity ratios (V_r = 5.5 and 7.5), three spacing ratios (L/D = 3.5, 5.5 and 7.5) and three different control cases. Cases 1 and 2, respectively, deal with the effect of rotary oscillation of front and rear cylinders, while Case 3 considers the effect of applied rotary oscillation to both cylinders. Findings The results show that in Case 3, the FIV of both cylinders is perfectly reduced, while in Case 2, only the vibration of rear cylinder is mitigated and no change is observed in the vortex-induced vibration of front cylinder. In Case 1, by rotary oscillation of the front cylinder, depending on the reduced velocity and the spacing ratio values, the transverse oscillation amplitude of the rear cylinder suppresses, remains unchanged and even increases under certain conditions. Hence, at every spacing ratio and reduced velocity, an independent controller system for each cylinder is necessary to guarantee a perfect vibration reduction of front and rear cylinders. Originality/value The current manuscript seeks to deploy a type of active rotary oscillating (ARO) controller to attenuate the FIV of two tandem-arranged cylinders placed on elastic supports. Three different cases are considered so as to understand the interaction of these cylinders regarding the rotary oscillation.

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Two-degree-of-freedom flow-induced vibration suppression of a circular cylinder via externally forced rotational oscillations: comparison of active open-loop and closed-loop control systems

Rabiee

2020

J Braz. Soc. Mech. Sci. Eng.

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Regenerative semi-active vortex-induced vibration control of elastic circular cylinder considering the effects of capacitance value and control parameters

Cited by 9 publications

References 33 publications

Transverse FIV suppression of square cylinder using two control rods of varying size and distance in lock-in and galloping regions

Transverse FIV suppression of square cylinder using two control rods of varying size and distance in lock-in and galloping regions

The effect of externally applied rotational oscillations on FIV characteristics of tandem circular cylinders for different spacing ratios

Two-degree-of-freedom flow-induced vibration suppression of a circular cylinder via externally forced rotational oscillations: comparison of active open-loop and closed-loop control systems

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