One degree-of-freedom vortex-induced vibrations at constant Reynolds number and mass-damping

Riches, Graham; Morton, Chris

doi:10.1007/s00348-018-2603-3

Cited by 14 publications

(4 citation statements)

References 24 publications

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“…In addition, only one frequency component was found in the displacement response during the nodal-shaped oscillation. These characteristics distinguish it significantly from previously reported beat phenomena [5,[18][19][20][21].…”

Section: Discussionsupporting

confidence: 68%

“…Therefore, he concludes that the amplitude modulation above is a beat phenomenon. Based on the test results, Riches G and Morton C [20] further confirmed this conclusion. They also discovered that amplitude modulation is more likely to occur when structural damping is low.…”

Section: Introductionmentioning

confidence: 65%

“…In the above studies [1-4, 6, 7], the time-domain displacement response of the VIV of the transversely elastically supported cylinder generally exhibits a limit cycle oscillation (LCO) of equal amplitude. However, the amplitude of vortex vibrations in a few studies [5,[18][19][20][21][22][23] fluctuates greatly rather than being uniform. As early as 1968, Feng et al [5] observed gourd-shaped oscillation of small amplitude at the onset boundary of VIV and termed them as amplitude modulation phenomena (see figure 1(a)).…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on the nodal-shaped oscillation in vortex-induced vibration of a rectangular cylinder

Lyu,

Lim,

Zhang

2023

Physics of Fluids

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This paper presents a peculiar nodal-shaped oscillation in vortex-induced vibration (VIV). This response is distinct from the commonly observed limit cycle oscillation in VIV and other aeroelastic problems. To gain insight into the dynamics in nodal-shaped oscillation, we conduct wind tunnel tests to investigate the VIV response of a freely oscillating rectangular cylinder with various transverse structural natural frequencies fs and wind speeds. The evolution of the flow field during nodal-shaped oscillation was examined using time-frequency analysis and modal analysis. During the divergent stage of the nodal-shaped oscillation, two modes, namely, the wake mode with a frequency of f = 1.28fs and the structure mode with a frequency of f = fs, were found to dominate the response of the flow. The two modes in VIV are coupled and compete with each other, diverging the oscillation of the structure. As the oscillation diverges and the amplitude increases to the maximum, the wake mode vanishes, which disengages the coupling of the fluid and structure modes. This stops the VIV and the oscillation decays until the wake mode reappears at f = 1.28fs. The above processes cycle over and over again, resulting in nodal-shaped (divergent-decay-divergent-decay) oscillation cycles. This finding explains the underlying dynamical mechanism of nodal-shaped oscillation and demonstrates the strong relationship between the wake mode and VIV.

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Section: Discussionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on the nodal-shaped oscillation in vortex-induced vibration of a rectangular cylinder

Lyu,

Lim,

Zhang

2023

Physics of Fluids

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“…with a single degree of freedom, under the effect of a uniform oncoming flow normal to its axis, represents a canonical problem to study a particular form of FIV, called vortex-induced vibrations (VIV). This system has been extensively examined in prior works, where the direction of motion was either normal to the current (Feng 1968;Mittal & Tezduyar 1992;Hover, Techet & Triantafyllou 1998;Khalak & Williamson 1999;Shiels, Leonard & Roshko 2001;Klamo, Leonard & Roshko 2006;Leontini et al 2006;Riches & Morton 2018), aligned with the current (Naudascher 1987;Okajima, Kosugi & Nakamura 2002;Cagney & Balabani 2013;Konstantinidis 2014;Gurian, Currier & Modarres-Sadeghi 2019;Konstantinidis, Dorogi & Baranyi 2021) or at an arbitrary angle (Brika & Laneville 1995;Bourguet 2019;Benner & Modarres-Sadeghi 2021). In the following, the directions normal and parallel to the current are referred to as the cross-flow and in-line directions, respectively.…”

Section: Introductionmentioning

confidence: 99%

Flow-induced vibrations of a cylinder along a circular arc

Bourguet

2022

J. Fluid Mech.

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An elastically mounted circular cylinder, immersed in a cross-current and free to move along a rectilinear path, is subjected to vortex-induced vibrations (VIV). These vibrations develop through a mechanism referred to as lock-in, where body motion and vortex shedding synchronize at a frequency that may deviate both from the oscillator natural frequency and from the vortex shedding frequency past a fixed cylinder. The present numerical study aims at extending the analysis to curved trajectories, by considering that the cylinder is free to translate along a circular path. The Reynolds number based on the body diameter ( $D$ ) and current velocity ( $U$ ) is set to $100$ . A wide range of path radii, from $0.05D$ to $10D$ , and values of the reduced velocity (inverse of the oscillator natural frequency non-dimensionalized by $D$ and $U$ ) up to $30$ are examined, for the concave and convex configurations, i.e. the circular path centre located upstream or downstream of the cylinder. Path curvature results in a major alteration of the flow–body system behaviour compared with rectilinear VIV, with substantially different evolutions in the concave and convex configurations. In addition to the typical lock-in mechanism, two subharmonic forms of synchronization, at half and one third of vortex formation frequency, are uncovered in the convex configuration. They coexist with a desynchronized regime where the body and the flow oscillate at incommensurable frequencies. The four interaction regimes exhibit contrasted trends in terms of structural response, spatiotemporal organization of the wake and associated forces. They particularly differ by their symmetry properties, which are closely linked to the possible reconfiguration of the oscillator due to mean fluid forcing.

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Data-Driven Identification of Robust Low-Order Models for Dominant Dynamics in Turbulent Flows

Schubert

Sieber

Oberleithner

et al. 2021

Springer Proceedings in Physics

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One degree-of-freedom vortex-induced vibrations at constant Reynolds number and mass-damping

Cited by 14 publications

References 24 publications

Experimental investigation on the nodal-shaped oscillation in vortex-induced vibration of a rectangular cylinder

Experimental investigation on the nodal-shaped oscillation in vortex-induced vibration of a rectangular cylinder

Flow-induced vibrations of a cylinder along a circular arc

Data-Driven Identification of Robust Low-Order Models for Dominant Dynamics in Turbulent Flows

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