Multicylinder Flow-Induced Motions: Enhancement by Passive Turbulence Control at 28,000&lt;Re&lt;120,000

Kim, Eun Soo; Bernitsas, Michael M.; Kumar, R. Ajith

doi:10.1115/1.4007052

Cited by 41 publications

(17 citation statements)

References 34 publications

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“…Until today, numerous devices have been designed to harvest energy in the ocean or river flow, such as the utilization of wave [6,7] and tidal current [8,9]. Specifically, VIVACE (Vortex Induced Vibration for Aquatic Clean Energy) converter was designed to extract clean and renewable hydrokinetic energy by utilizing FIM [5] and further developed in the Marine Renewable Energy Laboratory (MRELab) at the University of Michigan [10][11][12][13][14][15]. The simplest form of the VIVACE module is a single smooth circular cylinder mounted on springs with a power take-off system.…”

Section: Introductionmentioning

confidence: 99%

Flow induced motion and energy harvesting of bluff bodies with different cross sections

Ding

Zhang

et al. 2015

Energy Conversion and Management

170

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Section: Introductionmentioning

confidence: 99%

Flow induced motion and energy harvesting of bluff bodies with different cross sections

Ding

Zhang

et al. 2015

Energy Conversion and Management

170

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“…Membranes are excited by the von Kármán vortex street forming behind a bluff body which can transform the flow energy into piezoelectric energy. Bernitsas and his coworkers [25,26] studied fluid-induced vibrations of smooth cylinders with PTC module, and they divided the galloping into two categories: soft galloping and hard galloping. The former one refers to the gradual increase of the flow velocity when the object is transformed from vortexinduced vibration to galloping by means of self-excitation; the latter one means that the bluff body cannot change from self-excitation to galloping, but it can be converted to galloping by external excitation at a high flow rate.…”

Section: Introductionmentioning

confidence: 99%

Design, Modeling, and Experiments of the Vortex‐Induced Vibration Piezoelectric Energy Harvester with Bionic Attachments

Jin

Wang

et al. 2019

Complexity

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Since the energy demand increases, the sources of fluid energy such as wind energy and marine energy have attracted widespread attention, especially vortex-induced vibrations excited by wind energy. It is well known that the lock-in effect in vortex-induced vibration can be applied to the piezoelectric energy harvester. Although numerous researches have been conducted on piezoelectric energy harvesting devices in recent years, a common problem of low bandwidth and harvesting efficiency still exists. In order to increase the response amplitude and decrease the threshold wind speed of vortex-induced vibration, a bionic attachment structure is proposed based on the experimental method. In the present work, twelve models are designed according to the size of pits and hemispheric protrusions which are added to the surface of a flexible smooth cylinder. Compared with the smooth cylinder which is taken as a carrier, the harvester with the bionic structure shows stronger energy capture performance on the whole. As the threshold speed decelerates from 1.8m/s to 1 m/s, the bandwidth, on the contrary, increases from 39.3% to 51.4%. Particularly, for the 10 mm pits structure with 5 columns, its peak voltage can reach 47 V, and its peak power can reach 1.21 mW with a resistance of 800 kΩ, 0.57 mW higher than that of the smooth cylinder. Comparatively speaking, the hemispherical projections structure figures with a much more different energy capturing characteristic. Starting from the column, the measured voltage of the hemispherical bionic harvester is much smaller than that of the smooth cylinder, with a peak voltage less than 15 V and a reducing bandwidth. However, compared with the smooth cylinder, hemispheric projections with 3 columns have a better energy capture effect with a measured voltage of 35V, a resistance of 800kΩ, and a wind speed of 3.097 m/s. Besides, its output power also enhances from 0.48 to 0.56 mW.

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“…It uses VIV and galloping with a single cylinder. Those motions are further enhanced by properly implementing gap flow with multiple cylinders [16]. The higher and faster the FIM oscillations, the more power the cylinder will convert from hydrokinetic to mechanical.…”

Section: Introductionmentioning

confidence: 99%

Computational and Experimental Assessment of Turbulence Stimulation on Flow Induced Motion of a Circular Cylinder

Kınacı

Lakka

Sun

et al. 2016

Journal of Offshore Mechanics and Arctic Engineering

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Vortex-induced vibrations (VIVs) are highly nonlinear and it is hard to approach the problem analytically or computationally. Experimental investigation is therefore essential to address the problem and reveal some physical aspects of VIV. Although computational fluid dynamics (CFDs) offers powerful methods to generate solutions, it cannot replace experiments as yet. When used as a supplement to experiments, however, CFD can be an invaluable tool to explore some underlying issues associated with such complicated flows that could otherwise be impossible or very expensive to visualize or measure experimentally. In this paper, VIVs and galloping of a cylinder with selectively distributed surface roughness—termed passive turbulence control (PTC)—are investigated experimentally and computationally. The computational approach is first validated with benchmark experiments on smooth cylinders available in the literature. Then, experiments conducted in the Marine Renewable Energy Laboratory (MRELab) of the University of Michigan are replicated computationally to visualize the flow and understand the effects of thickness and width of roughness strips placed selectively on the cylinder. The major outcomes of this work are: (a) Thicker PTC initiates earlier galloping but wider PTC does not have a major impact on the response of the cylinder and (b) The amplitude response is restricted in VIV due to the dead fluid zone attached to the cylinder, which is not observed in galloping.

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Multicylinder Flow-Induced Motions: Enhancement by Passive Turbulence Control at 28,000<Re<120,000

Cited by 41 publications

References 34 publications

Flow induced motion and energy harvesting of bluff bodies with different cross sections

Flow induced motion and energy harvesting of bluff bodies with different cross sections

Design, Modeling, and Experiments of the Vortex‐Induced Vibration Piezoelectric Energy Harvester with Bionic Attachments

Computational and Experimental Assessment of Turbulence Stimulation on Flow Induced Motion of a Circular Cylinder

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