Self-adaptive turbulence eddy simulation of flow control for drag reduction around a square cylinder with an upstream rod

Min, Yaobing; Wu, Wen-Tuan; Zhang, Hongda; Han, Xingsi

doi:10.1016/j.euromechflu.2023.03.008

Cited by 4 publications

(2 citation statements)

References 51 publications

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“…VIV may be generated by two distinct forms of oscillations: self-excited oscillations and forced oscillations, which are alternatively known as vibration-induced vortices. Furthermore, VIV may occur either spontaneously or as a result of involuntary oscillations at different speeds and magnitudes [8][9][10]. The research conducted by Min et al, [10] showed that a Reynolds number of 80 successfully mitigated the wake, hence facilitating the positioning of a compact control cylinder downstream of the primary cylinder within close proximity of the wake [11].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Different Mass Ratios on Vortex-Induced Vibration Energy Extraction of Four Cylinder Arrays

Fatin Alias,

Mohd Hairil Mohd,

Mohd Asamudin A. Rahman

2024

ARFMTS

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Currently, there is a growing demand for renewable energy harnessed from fluid dynamics within the oil and gas industry. The surge in demand has propelled electricity to become a vital and irreplaceable form of universal energy worldwide. Vortex-Induced Vibrations (VIV) energy harvesting shows great potential as a technology for capturing energy from flowing bodies of water. The purpose of this research is to investigate the numerical aspect of VIV in rigid circular cylinders with the intention of capturing renewable energy from the sea. The investigation employs a Vortex-Induced Vibration Aquatic Clean Energy (VIVACE) converter to analyze the vibration characteristics of densely packed cylinders featuring varying mass ratios (m*) at both minimum and maximum values. Another purpose of the study is to investigate the effect that m* has on the performance of a VIV converter that is comprised of four cylinders positioned in a staggered pattern. For the purpose of analyzing power conversion in the VIV energy converter model across a wide range of mass ratios (from 2.36 to 12.96), simulations are carried out with a Reynolds number of 82000. The findings indicate that the highest converted power reaches a peak of 7.48 W with a mass ratio of 2.36, whereas a greater mass ratio of 12.96 results in only 4.33. The study highlights the substantial influence of mass ratios on the extraction of power output from VIV. The results essentially offer crucial information about the optimum mass ratio in closed four cylinder arrays to design VIV energy harvesting to produce clean and renewable energy sources.

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Section: Introductionmentioning

confidence: 99%

The Influence of Different Mass Ratios on Vortex-Induced Vibration Energy Extraction of Four Cylinder Arrays

Fatin Alias,

Mohd Hairil Mohd,

Mohd Asamudin A. Rahman

2024

ARFMTS

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“…The highest drag reduction 65.15% is attained when Re = 200 and the spacing ratio g = 2. Min et al (2023) built the turbulence model of the upstream rod-downstream square cylinder system by using Self-Adaptive Turbulence Eddy Simulations to investigate the drag reduction mechanism. They found that the rod can help the effective diffusion of vorticity in the separating shear layer.…”

Section: Introductionmentioning

confidence: 99%

Numerical comprehensive evaluation of the flow control effect on a circular cylinder with a control rod

Gong,

Wang,

Liu

et al. 2024

Fluid Dyn. Res.

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The drag reduction of the single circular cylinder is achieved by changing the position of an additional control rod in the present work. In order to look for where to place the control rod will help the drag force exerted on the main cylinder surface as little as possible, the additional control rod is arranged at various positions in the downstream region, the upstream region, and the middle region of the single circular cylinder, respectively. The numerical results show that the maximum drag reduction rate of the single circular cylinder can be up to 21.68%. While the additional control rod is located at some specific positions in the flow field, the drag of the single circular cylinder will increase. However, if two bluff bodies (the main circular cylinder and the control rod) are considered as a whole system, due to the extra drag contribution of the control rod, the maximum drag reduction effect of the system is 8.65%. Additionally, the lift exerted on the main cylinder and the control rod has changed a lot due to the interaction between two bluff bodies. Furthermore, the Dynamic Mode Decomposition (DMD) analysis method is employed to probe the mechanism of drag variation employing the dominant flow modes.

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Effects of synthetic jet control parameters on characteristics of flow around a square cylinder at subcritical Reynolds number

Ding,

Cheng,

Liu

et al. 2024

Ocean Engineering

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Self-adaptive turbulence eddy simulation of flow control for drag reduction around a square cylinder with an upstream rod

Cited by 4 publications

References 51 publications

The Influence of Different Mass Ratios on Vortex-Induced Vibration Energy Extraction of Four Cylinder Arrays

The Influence of Different Mass Ratios on Vortex-Induced Vibration Energy Extraction of Four Cylinder Arrays

Numerical comprehensive evaluation of the flow control effect on a circular cylinder with a control rod

Effects of synthetic jet control parameters on characteristics of flow around a square cylinder at subcritical Reynolds number

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