Flow-induced vibration of a square cylinder and downstream flat plate associated with micro-scale energy harvester

Maruai, Nurshafinaz Mohd; Ali, Mohamed Sukri Mat; Ismail, Mohamad Hafiz; Zaki, Sheikh Ahmad

doi:10.1016/j.jweia.2018.01.010

Cited by 24 publications

(13 citation statements)

References 31 publications

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“…Figure 2 shows the results of the present experiments for the isolated cylinder, which are compared with the previous studies, i.e. the experiments by Kawabata et al, [13] and Ismail et al, [23], and the simulation study by Maruai et al, [4] as shown in Table 1. In Figure 2(a), the nondimensional amplitude is multiplied by Sc and plotted against the reduced velocity UR for fair comparison since the maximum KVIV amplitude would be inversely proportional with Sc if the vibration system were linear.…”

Section: Vibration Behaviour Of the Isolated Square Cylindermentioning

confidence: 76%

“…In this method, other bodies are positioned downstream of the oscillating cylinder, e.g. splitter plates (Assi et al, [2]; Ali et al, [3]; Maruai et al, [4]; Dash et al, [5]), a circular cylinder (Shirakashi et al, [6]; Bae et al, [7]; Ngyuen et al, [8]; Ma et al, [9]; Chauhan et al, [10]) or a strip plate in cruciform arrangement (Koide et al, [11]; Kato et al, [12]; Kawabata et al, [13]) and fairings (Assi et al, [14]; Yu et al, [15]; Wang et al, [16]; Lou et al, [17]; Zheng and Wang [18]).…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Effect of a Downstream Square Plate on Vortex-induced Vibration and Galloping of a Square Cylinder

Mohamed¹,

Zaki²,

Shirakashi³

et al. 2020

ARFMTS

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A square cylinder exposed to a fluid flow is regarded as the simplest model of the structures in sea water or air flow, and known to show the Karman vortex induced vibration (KVIV) and the galloping in separate or overlapping ranges of flow velocity. In this study, wind tunnel experiments were performed on the cross-flow vibration of a square cylinder, and effects of a downstream square plate on the vibration were investigated to develop a convenient passive technique for vibration control. The square plate has a side length w equal to the side length of the square cylinder D (= 26 mm) and set downstream with the gap ratio S/D in the range of 0.12 to 2.90 where S is the separation gap. The results show that the square plate has only little influence on KVIV and enhances the galloping, resulting in the lower critical reduced velocity of galloping Ug i.e. the onset velocity of galloping reduced to about half of the isolated counterpart at S/D = 0.98. Most remarkable effect of the downstream square plate is the enhancement of the vibration near the peak velocity of KVIV at S/D = 1.17, which is around five times larger as compared with the isolated counterpart. This may indicate occurrence of the wake-body-interference fluid elastic vibration.

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Section: Vibration Behaviour Of the Isolated Square Cylindermentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effect of a Downstream Square Plate on Vortex-induced Vibration and Galloping of a Square Cylinder

Mohamed¹,

Zaki²,

Shirakashi³

et al. 2020

ARFMTS

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show abstract

“…In order to harvest energy from FSI using PZT, two types of galloping mechanisms can be used: transverse galloping [91,[152][153][154][155] and wake galloping [91,156,157], as shown in Figures 11 and 12, respectively. The PZT patch is attached on the fixed end of an elastic cantilever beam with an external circuit from which it can be shocked with variable resistance.…”

Section: Galloping-based Pehmentioning

confidence: 99%

A Review on Mechanisms for Piezoelectric-Based Energy Harvesters

2018

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From last few decades, piezoelectric materials have played a vital role as a mechanism of energy harvesting, as they have the tendency to absorb energy from the environment and transform it to electrical energy that can be used to drive electronic devices directly or indirectly. The power of electronic circuits has been cut down to nano or micro watts, which leads towards the development of self-designed piezoelectric transducers that can overcome power generation problems and can be self-powered. Moreover, piezoelectric energy harvesters (PEHs) can reduce the need for batteries, resulting in optimization of the weight of structures. These mechanisms are of great interest for many researchers, as piezoelectric transducers are capable of generating electric voltage in response to thermal, electrical, mechanical and electromagnetic input. In this review paper, Fluid Structure Interaction-based, human-based, and vibration-based energy harvesting mechanisms were studied. Moreover, qualitative and quantitative analysis of existing PEH mechanisms has been carried out.

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“…For instance, in the work by Sun, Owen, and Wright (2009), the performance of the 2D-RANS with regards to its 3D counterpart is analyzed, showing good agreement. In the wind engineering field, some examples of successful application of this approach may be found in the works by Šarkić, Fisch, Höffer, and Bletzinger (2012), Šarkić, Höffer, and Brčić (2015), , , Vairo (2003), Brusiani, de Miranda, Patruno, Ubertini, and Vaona (2013), Chen, Wang, Zhu, and Li (2018), or Maruai, Ali, Ismail, and Zaki (2018), among many others. In those works, the performance of 2D URANS to obtain the mean pressure distribution over the cross-sections analyzed and the force coefficients was demonstrated.…”

Section: Urans Governing Equationsmentioning

confidence: 99%

Numerical simulations of the aerodynamic response of circular segments with different corner angles by means of 2D URANS. Impact of turbulence modeling approaches

Montoya

Nieto

Álvarez

et al. 2018

Engineering Applications of Computational Fluid Mechanics

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This paper presents the results of numerical and experimental investigations on the force coefficients and Strouhal numbers of circular segments considering different corner angles or chord to sagitta ratios. The research is motivated because these geometries are becoming increasingly popular in several engineering disciplines. The so-called D-section (semi-circular cylinder with a corner angle of 90 •) has been experimentally studied in the past, since it is a galloping prone geometry. However, there is a lack of research for cases with different corner angles, and the numerical investigations related to this topic are particularly scarce. In this work, a 2D Unsteady Reynolds Averaged Navier-Stokes approach has been adopted aiming to study the circular segments at the sub-critical regime, considering corner angles from 40 • to 90 • , and the flow parallel to the rectilinear side. These sections were found to be particularly challenging since they present massive flow separation on the rectilinear side, alongside the inherent difficulties related to modeling the flow along curved surfaces at high Reynolds numbers. The impact of introducing low-Reynolds-number and curvature corrections in the k − ω SST turbulence model and the performance of the Transition SST model have been extensively studied.

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Flow-induced vibration of a square cylinder and downstream flat plate associated with micro-scale energy harvester

Cited by 24 publications

References 31 publications

Experimental Investigation of the Effect of a Downstream Square Plate on Vortex-induced Vibration and Galloping of a Square Cylinder

Experimental Investigation of the Effect of a Downstream Square Plate on Vortex-induced Vibration and Galloping of a Square Cylinder

A Review on Mechanisms for Piezoelectric-Based Energy Harvesters

Numerical simulations of the aerodynamic response of circular segments with different corner angles by means of 2D URANS. Impact of turbulence modeling approaches

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