Flow-Induced Vibrations of Single and Multiple Heated Circular Cylinders: A Review

Ali, Ussama; Islam, Md Didarul; Janajreh, Isam; Yap, Yit Fatt; Alam, Md. Mahbub

doi:10.3390/en14248496

Cited by 45 publications

(8 citation statements)

References 235 publications

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“…As the Reynolds number increases, a bluff body approaches vortex shedding, galloping, and turbulence [5]. Usually the twodimensional set of motion equations governs the transverse x and streamwise y motion of the bluff body [7]. The small scale of the oscillations enables us to hypothesize that they are caused not by external turbulence but by the droplet itself, which perturbs the oncoming flow.…”

Section: Discussionmentioning

confidence: 99%

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Oscillatory Signatures in the Raindrop Motion Relative to the Air Medium with Terminal Velocity

et al. 2022

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This paper aims to study the path oscillations of single, spherical water droplets levitated in a wind tunnel to better comprehend the mechanical motion of small raindrops. The observations were carried out in the Mainz vertical wind tunnel. The discrete, fast Fourier transform was used to determine the oscillatory frequencies of the droplet paths, and the Hilbert transform was applied to analyze their instantaneous frequency stability. Both transversal and streamwise components of the path oscillations are described with typical frequencies of several tens of Hertz. The studied oscillations elongate the paths, reduce the terminal velocity of the smallest droplets, and make the rain droplet fall in a non-uniform motion even after reaching terminal velocity. The terminal velocity can be considered as physically having been reached if our proposed practical criterion is satisfied. From a fluid mechanics perspective, the paper fills an experimental gap in the studies of the paths oscillations of single, liquid spheres of microscopic sizes at low Bond numbers <1 and relatively low Reynolds numbers ~102.

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Section: Discussionmentioning

confidence: 99%

“…However, little attention has been paid to the vibrational path motion of spheres superimposed on their averagely straight movement through fluid. Although there are a number of studies about vibrating cylinders [5][6][7], they have not described the case of spherical symmetry.…”

Section: Introductionmentioning

confidence: 99%

Oscillatory Signatures in the Raindrop Motion Relative to the Air Medium with Terminal Velocity

et al. 2022

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“…The phenomenon of vortex-induced vibrations (VIV) has long been a subject of interest and concern in engineering and fluid dynamics, particularly when considering the structural integrity of cylindrical bodies exposed to flowing fluids [1]. VIV refers to the oscillations induced in a structure due to the unsteady shedding of vortices in its wake [2], [3], a phenomenon that can lead to fatigue and potential structural failure [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Passive Vibration Reduction in Circular Cylinders: The Role of Slits

Ali,

Islam,

Janajreh

2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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This work investigates a passive flow control method to mitigate vortex-induced vibration (VIV) by introducing a slit into a circular structure. The impact of varying slit sizes on the behaviour of a cylinder subjected to VIV is investigated across different reduced velocities (Ur) at a Reynolds number (Re) of 100. The size of the slit (S/D) is adjusted from 0 (without slit) to 0.1 & 0.2, where S corresponds to the width of slit & D the cylinder diameter. The mass and damping ratios are fixed at m* = 10 and ζ = 0.005, respectively, while Ur is varied from 2 to 10. The numerical analysis is conducted using Ansys/Fluent, incorporating mesh motion to consider cylinder vibration. The outcomes are presented in terms of vibration amplitude & frequency, drag & lift coefficients, Strouhal number, and vorticity contours. The findings suggest that the slit reduces lift and drag coefficients, effectively suppressing VIV. Examining maximum vibration amplitude, a 10% slit results in a 5.16% decrease, whereas a 20% slit leads to a substantial 34.27% reduction compared to a solid cylinder.

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“…Readers can refer to reviews by Sarpkaya (2004), Williamson & Govardhan (2004), Bearman (1984, 2011), Wu, Ge & Hong (2012) and Ali et al. (2021). Nonetheless, based on Derakhshandeh & Alam's (2019) classification of the cross-section shapes, in addition to the continuous and finite curvature shape (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…A large number of fundamental studies on the VIV of a circular cylinder have provided a comprehensive understanding of this crucial fluid-structure interaction (FSI) problem. Readers can refer to reviews by Sarpkaya (2004), Williamson & Govardhan (2004), Bearman (1984Bearman ( , 2011, Wu, Ge & Hong (2012) and Ali et al (2021). Nonetheless, based on Derakhshandeh & Alam's (2019) classification of the cross-section shapes, in addition to the continuous and finite curvature shape (e.g.…”

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confidence: 99%

Two-degree-of-freedom flow-induced vibrations of a D-section prism

Chen,

Alam,

et al. 2023

J. Fluid Mech.

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This paper presents a comprehensive study of flow-induced vibrations of a D-section prism with various angles of attack $\alpha$ ( $= 0^{\circ }\unicode{x2013}180^{\circ }$ ) and reduced velocity $U^*$ (= 2–20) via direct numerical simulations at a Reynolds number ${Re} = 100$ . The prism is allowed to vibrate in both streamwise and transverse directions. Based on the characteristics of vibration amplitudes and frequencies, the responses are classified into nine different regimes: typical VIV regime ( $\alpha = 0^{\circ }\unicode{x2013}30^{\circ }$ ), hysteretic VIV regime ( $\alpha = 35^{\circ }\unicode{x2013}45^{\circ }$ ), extended VIV regime ( $\alpha = 50^{\circ }\unicode{x2013}55^{\circ }$ ), first transition response regime ( $\alpha = 60^{\circ }\unicode{x2013}65^{\circ }$ ), dual galloping regime ( $\alpha = 70^{\circ }$ ), combined VIV and galloping regime ( $\alpha = 75^{\circ }\unicode{x2013}80^{\circ }$ ), narrowed VIV regime ( $\alpha = 85^{\circ }\unicode{x2013}145^{\circ }$ ), second transition response regime ( $\alpha = 150^{\circ }\unicode{x2013}160^{\circ }$ ) and transverse-only galloping regime ( ${\alpha = 165^{\circ }\unicode{x2013}180^{\circ }}$ ). In the typical and narrowed VIV regimes, the vibration frequencies linearly increase with increasing $U^*$ . In the hysteretic and extended VIV regimes, the vibration amplitudes are large in a wider range of $U^*$ as a result of the closeness of the vortex shedding frequency to the natural frequency of the prism because of the shear layer reattachment and separation point movement. In the two galloping regimes, the transverse amplitude keeps increasing with $U^*$ while the streamwise amplitude stays small or monotonically increases with increasing $U^*$ . In the combined VIV and galloping regime, the vibration amplitude is relatively small in the VIV region while drastically increasing with increasing $U^*$ in the galloping region. In the transition response regimes, the vibration frequencies are galloping-like but the divergent amplitude cannot persist at high $U^*$ . Furthermore, a wake mode map in the examined parametric space is offered. Particular attention is paid to physical mechanisms for hysteresis, dual galloping and flow intermittency. Finally, we probe the dependence of the responses on Reynolds numbers, mass ratios and degrees of freedom, and analyse the roles of the shear layer reattachment and separation point movement in the appearance of multiple responses.

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Flow-Induced Vibrations of Single and Multiple Heated Circular Cylinders: A Review

Cited by 45 publications

References 235 publications

Oscillatory Signatures in the Raindrop Motion Relative to the Air Medium with Terminal Velocity

Oscillatory Signatures in the Raindrop Motion Relative to the Air Medium with Terminal Velocity

Passive Vibration Reduction in Circular Cylinders: The Role of Slits

Two-degree-of-freedom flow-induced vibrations of a D-section prism

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