Multiple lock-ins in vortex-induced vibration of a filament

Furquan, Mohd; Mittal, Sanjay

doi:10.1017/jfm.2021.209

Cited by 24 publications

(14 citation statements)

References 40 publications

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“…Most energy harvesting devices have been developed on the basis of the self-excited vibration, even though the critical flow velocity activating the vibration is relatively high (Tang, Païdoussis & Jiang 2009;Michelin & Doaré 2013;Xia, Michelin & Doaré 2015;Yu & Liu 2016). Next, the critical flow velocity can be reduced by upstream installation of a bluff body, enhancing the instability in a wider range of flow velocity (Allen & Smits 2001;Taylor et al 2001;Manela & Howe 2009;Gilmanov, Le & Sotiropoulos 2015;Hu et al 2018;Furquan & Mittal 2021). Vortices shed from the bluff body give rise to a forced vibration with a higher vibration frequency and a lower vibration amplitude than those of the self-excited vibration.…”

Section: Introductionmentioning

confidence: 99%

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Snap-through dynamics of a buckled flexible filament in a uniform flow

Mao,

Liu,

Sung

2023

J. Fluid Mech.

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The flow-induced snap-through dynamics of a buckled flexible filament was explored using the penalty immersed boundary method. The effects of the filament length, bending rigidity and Reynolds number on the mode transition were systematically examined. Three different modes were observed when the aforementioned parameters were varied: an equilibrium mode, a streamwise oscillation mode and a snap-through oscillation mode. Two mode transitions occurred when the bending rigidity was lowered and the length and Reynolds number were increased: a direct transition from the equilibrium mode to the snap-through oscillation mode and the successive appearance of the three modes. An increase in transverse fluid force induced the snap-through oscillation mode. A vortex-induced vibration and a self-excited vibration occurred in the streamwise oscillation mode and the snap-through oscillation mode, respectively. A wake pattern of 2S appeared in the streamwise oscillation mode, and a pattern of 2S + 2P appeared in the snap-through oscillation mode. A hysteresis was observed near the critical Reynolds number. The hysteresis loop increased in magnitude with increasing bending rigidity. The greater energy harvesting was achieved by the larger deflection and the higher strain energy. We found that most of the strain energy was concentrated in the last half of the filament.

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Section: Introductionmentioning

confidence: 99%

“…2001; Manela & Howe 2009; Gilmanov, Le & Sotiropoulos 2015; Hu et al . 2018; Furquan & Mittal 2021). Vortices shed from the bluff body give rise to a forced vibration with a higher vibration frequency and a lower vibration amplitude than those of the self-excited vibration.…”

Section: Introductionmentioning

confidence: 99%

Snap-through dynamics of a buckled flexible filament in a uniform flow

Mao,

Liu,

Sung

2023

J. Fluid Mech.

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“…org/10.1017/jfm.2024.327). In the previous numerical simulations, the film in the cylinder wake always fluttered or flapped periodically irrespective of the streamwise length (Lee & You 2013;Wu et al 2014;Sahu et al 2019;Pfister & Marquet 2020;Furquan & Mittal 2021). Additionally, in the experiment of Shukla et al (2013), the aperiodic flutter of the flexible film in the cylinder wake only occurred when the flexible film was long enough to yield a very small effective bending stiffness (see (1.1a,b)), as an example, L/D = 5 and K B ∼ O(10 −4 ), three orders of magnitude lower than the minimum K B = 1.82 × 10 −1 where the aperiodic flutter emerges in our experiment.…”

Section: Regimes Of Motion Statesmentioning

confidence: 93%

“…However, a substantial number of fundamental issues related to this model are seemingly long shunned and thus demand urgent solution. The majority of investigations are predominantly performed by two-dimensional numerical simulations at pretty low Reynolds numbers (even at Reynolds numbers involving laminar vortex shedding), such as Re = 100 in Lee & You (2013), Re = 150 in Wu et al (2014), Re = 100 and 200 in Kundu et al (2017), Re = 150 in Sahu et al (2019), Re = 80 in Pfister & Marquet (2020), Re = 150 in Furquan & Mittal (2021) and Re = 100 in Mao et al (2022), to name but a few, which are significantly smaller than the Reynolds number encountered by real-world flag flapping or fish swimming. Several noteworthy experiments with Re ∼ O(10 3 ) − O(10 5 ), including studies by Shukla et al (2013), Sharma & Dutta (2020, Deng et al (2021) and Cui et al (2022), present intriguing phenomena, but which are divergent from the results of numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Passive bionic motion of a flexible film in the wake of a circular cylinder: chaos and periodicity, flow–structure interactions and energy evolution

Duan,

Wang

2024

J. Fluid Mech.

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The self-sustained interactions between a flexible film and periodic vortices epitomize the spirit of fish swimming and flag flapping in nature, involving intricate patterns of flow–structure coupling. Here, we comprehensively investigate the multiple coupling states of a film in the cylinder wake mainly with experiments, complemented by theoretical solutions and nonlinear dynamical analyses. Four regimes of film motion states are identified in the parameter space spanned by the reduced velocity and the length ratio. These regimes are (i) keeping stationary, (ii) deflection flutter, (iii) hybrid flutter and (iv) periodic large-amplitude flapping, each governed by a distinct coupling mechanism, involving regular and irregular Kármán vortices, local instability of the elongated shear layers and 2P mode vortex shedding. The film futtering in regimes (ii) and (iii) is substantiated to be chaotic and bears a resemblance to the ‘entraining state’ of fish behind an obstacle in the river. The periodic flapping in regime (iv) manifests itself in an amalgam of standing and travelling waves, and has intrinsic relations to the ‘Kármán gaiting’ of fish in periodic vortices. With the spatiotemporal reconstruction for the periodic flapping, we procure the energy distributions on the film, revealing the energy transfer processes between the film and the large-scale vortices. The findings unequivocally indicate that the flow–structure interaction during the energy-release stage of the film is more intense than that during the energy-extraction stage. Given the similarities, the mathematical and physical methods presented in this work are also applicable to the research on biological undulatory locomotion.

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“…Shedding of vortices from the mast generates uneven pressure, which causes the mast to vibrate under the effect of varying aerodynamic forces. The vibration induced by vortices is called vortex induced vibration (VIV) [14,15]. Wang et al [16] proposed a novel vortex-induced wind energy harvester.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Hydroelectric Energy Harvester Based on a Hybrid Qiqi and Turbine Structure

Bao

Wang

et al. 2021

Energies

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The Qiqi structure design can automatically upset and spill its content once it arrives at limit capacity under vertical water flow excitation. Considering this function, the Qiqi structure has been utilized for small hydroelectric energy harvesting lately. To investigate the tradeoff between the Qiqi structure and the turbine structure for small hydroelectric energy harvesting, an energy harvester based on a hybrid Qiqi and turbine structure is proposed for vertical water flow hydroelectric applications. The hybrid structure is composed of a rectangular Qiqi structure, with two blades inserted on both sides. Self-tipping function of the hybrid Qiqi structure and working principle of the structure is investigated in detail. The proposed structure has both the advantages of low flow velocity energy harvesting of the Qiqi structure and high flow velocity energy harvesting of the turbine structure. A hydroelectric energy harvesting application using the hybrid structure is given to demonstrate that the hybrid structure had a higher rotational speed than the Qiqi structure under vertical low water flow excitation and was able to work at relatively high flow rates. Thus, the investigated hybrid structure can help small rotational hydropower achieve better energy harvesting performance and work at wide-range flow rates under vertical ultra-low water flow applications. At 600 mL/min, 902 μJ of electrical energy was charged by the investigated structure, which is six times higher than that using the Qiqi structure alone.

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Multiple lock-ins in vortex-induced vibration of a filament

Abstract: Abstract

Cited by 24 publications

References 40 publications

Snap-through dynamics of a buckled flexible filament in a uniform flow

Snap-through dynamics of a buckled flexible filament in a uniform flow

Passive bionic motion of a flexible film in the wake of a circular cylinder: chaos and periodicity, flow–structure interactions and energy evolution

Experimental Study on Hydroelectric Energy Harvester Based on a Hybrid Qiqi and Turbine Structure

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