The effect of vortices structures on the flow-induced vibration of three flexible tandem cylinders

Fan, Xiantao; Zhong-chen, Wang; Wang, Yang; Tan, Wei

doi:10.1016/j.ijmecsci.2020.106132

Cited by 20 publications

(7 citation statements)

References 49 publications

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“…This case explains each time-dependent intermittent phenomenon based on a nonstationary series [25 -27]. Investigation of the effect of Reynolds' numbers on flow interference between two sideby-side stationary cylinders and associated flow-induced forces using the finite element method and wavelet analysis [28]. This wavelet precisely reconstructs various signals in different situations, such as upstream, downstream, and around the bluff body (cylinder) [29 -40].…”

Section: Introductionmentioning

confidence: 99%

Identification of Nonlinear System for Elastically Supported Cylinder on Cross-Flow Using Wavelet Transform

2024

jjmie

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This study investigates an application of the wavelet transform to identify the characteristics of a nonlinear system of an elastically supported cylinder in cross-flow under uniform airflow. The envelope of the time response and instantaneous frequency is extracted using the wavelet transform to identify the nonlinear characteristics of the system. Responses within the range of the lock-in and nonlinear jump phenomena were investigated. Flow-induced vibration in a cylinder supported by two beams shows that the wavelet transform can identify the lock-in phenomena in both forward-sweep and backwardssweep experiments. The study shown that the vibration phenomenon caused by a flow in a beam supported cylinder medium with forward-sweep and backwards-sweep does not affect the damping characteristic due to the stiffness. The result will be beneficial in controlling vibration effect.

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Section: Introductionmentioning

confidence: 99%

Identification of Nonlinear System for Elastically Supported Cylinder on Cross-Flow Using Wavelet Transform

2024

jjmie

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“…However, there are situations where fluids flow past more than two cylinders in different arrangements (Zdravkovich, 1987); for instance, the case of the shell and tube heat exchanger, oil and gas pipelines and the blades of multistage turbo-machines. Therefore, a few numerical and experimental works have increased the degree of complexity by studying the fluid flow over three cylinders (Bao et al , 2010; Fan et al , 2021a; Gu and Sun, 2001; Han et al , 2013; Harichandan and Roy, 2010; Kang, 2004; Pouryoussefi et al , 2011; Sumner et al , 1999; Zhang and Zhou, 2001; Zhou, 2003). In this case, several parameters can influence the flow characteristics such as the Reynolds number (Han et al , 2013; Harichandan and Roy, 2010), the gap spacing between two adjacent cylinders (Fan et al , 2021a; Sumner et al , 1999; Zhou, 2003) and the geometrical arrangement of the cylinders such as side-by-side (Kang, 2004; Sumner et al , 1999), tandem (Fan et al , 2021a; Han et al , 2013) and triangular arrangements (Bao et al , 2010; Gu and Sun, 2001; Pouryoussefi et al , 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a few numerical and experimental works have increased the degree of complexity by studying the fluid flow over three cylinders (Bao et al , 2010; Fan et al , 2021a; Gu and Sun, 2001; Han et al , 2013; Harichandan and Roy, 2010; Kang, 2004; Pouryoussefi et al , 2011; Sumner et al , 1999; Zhang and Zhou, 2001; Zhou, 2003). In this case, several parameters can influence the flow characteristics such as the Reynolds number (Han et al , 2013; Harichandan and Roy, 2010), the gap spacing between two adjacent cylinders (Fan et al , 2021a; Sumner et al , 1999; Zhou, 2003) and the geometrical arrangement of the cylinders such as side-by-side (Kang, 2004; Sumner et al , 1999), tandem (Fan et al , 2021a; Han et al , 2013) and triangular arrangements (Bao et al , 2010; Gu and Sun, 2001; Pouryoussefi et al , 2011). In addition to these parameters, the hydrodynamics of the flow are also dependent on the equal or unequal spacing between two adjacent cylinders (Zhang and Zhou, 2001).…”

Section: Introductionmentioning

confidence: 99%

A numerical study of two-dimensional laminar flow of power-law fluids around three circular cylinders in side-by-side arrangement

Benamor

Abidi-Saad

Mebrouk

et al. 2022

WJE

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Purpose This study aims at investigating two-dimensional laminar flow of power-law fluids around three unconfined side-by-side cylinders. Design/methodology/approach The numerical study is performed by solving the governing (continuity and momentum) equations using a finite volume-based code ANSYS Fluent. The numerical results have been presented for different combinations of the governing dimensionless parameters (dimensionless spacing, 1.2 = L = 4; Reynolds number, 0.1 = Re = 100; power-law index, 0.2 = n = 1.8). The dependence of the kinematic and macroscopic characteristics of the flow such as streamline patterns, distribution of the surface pressure coefficient, total drag coefficient with its components (pressure and friction) and total lift coefficient on these dimensionless parameters has been discussed in detail. Findings It is found that the separation of the flow and the apparition of the wake region accelerate as the dimensionless spacing decreases, the number of the cylinder increases and/or the fluid behavior moves from shear-thinning to Newtonian then to shear-thickening behavior. In addition, the distribution of the pressure coefficient on the surface of the cylinders presents a complex dependence on the fluid behavior index and Reynolds number when the dimensionless spacing between two adjacent cylinders is varied. At low Reynolds numbers, the drag coefficient of shear-thinning fluids is stronger than that of Newtonian fluids; this tendency decreases progressively with increasing of Re until a critical value; beyond the critical Re, the opposite trend is observed. The lift coefficient of the middle cylinder is null, whereas, the exterior cylinders experience opposite lift coefficients, which show a complex dependence on the dimensionless spacing, the Reynolds number and the power-law index. Originality/value The flow over bluff bodies is a practical engineering problem. In the literature, it can be seen that the previous studies on non-Newtonian fluids are limited to the flow over one or two cylinders (effect of an odd number of cylinders on each other). Besides that, the available results concerning the flow of Newtonian fluids over three cylinders are limited to the high Reynolds numbers region only. However, this work treats the flow of non-Newtonian power-law fluids past three circular cylinders in side-by-side arrangements under a wide range of Re. The outcome of the present study demonstrates that the augmentation of the geometry complexity to three cylinders (effect of pair surrounding cylinders on the surrounded ones in what concerns Von Karman Street phenomenon) causes a drastic change in the flow patterns and in the macroscopic characteristics. The present results may be used to predict the flow behavior around multiple side-by-side cylinders.

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“…It is called as the boundary-layer turbine as well [11] because it does not use a fluid to impact the blades, as in a traditional turbine but, rather, the boundary-layer effect. A bladeless vortex turbine [12] is another type of power generator that does not include rotating blades. It includes a fixed base whereby the structure is attached to an anchoring, and a flexible mast interacting more freely with the flowing fluid.…”

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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The effect of vortices structures on the flow-induced vibration of three flexible tandem cylinders

Cited by 20 publications

References 49 publications

Identification of Nonlinear System for Elastically Supported Cylinder on Cross-Flow Using Wavelet Transform

Identification of Nonlinear System for Elastically Supported Cylinder on Cross-Flow Using Wavelet Transform

A numerical study of two-dimensional laminar flow of power-law fluids around three circular cylinders in side-by-side arrangement

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

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