Effects of free tip shape and aspect ratio on flow around a finite cylinder with two free tips at subcritical Reynolds numbers

Liu, Qiliang; Gong, Shuguang; Xie, Guilan; Lu, Haishan; Zuo, Zhijian

doi:10.1016/j.compfluid.2023.106147

Computers & Fluids

2024

DOI: 10.1016/j.compfluid.2023.106147

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Effects of free tip shape and aspect ratio on flow around a finite cylinder with two free tips at subcritical Reynolds numbers

Qiliang Liu,

Shuguang Gong,

Guilan Xie

et al.

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2024

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Cited by 2 publications

References 38 publications

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Numerical investigation on the end effects of the flow past a finite rotating circular cylinder with two free ends

Liu,

Gong,

et al. 2024

Computers & Fluids

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Numerical investigation on the end effects of the flow past a finite rotating circular cylinder with two free ends

Liu,

Gong,

et al. 2024

Computers & Fluids

View full text Add to dashboard Cite

Coupling impacts of end effects and rotation on the three-dimensional flow around a rapidly rotating circular cylinder with two flat ends

Liu,

Gong,

et al. 2024

Physics of Fluids

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This paper studies the interactions of rotation and end effects and its effect on the flow around a rapidly rotating circular cylinder with two flat ends, using the large eddy simulation method. At a Reynolds number of 4.6×104, four aspect ratios are examined across spin ratios in the range of 0–7 with an increment of 0.5. The obtained results show that, when the spin ratio increases, the mean drag coefficient first decreases, then rapidly increases, and finally gradually decreases or becomes stable. Two critical spin ratios are identified. The mean lift coefficient first rapidly increases and then decreases slightly or stabilizes, with one critical spin ratio observed. When the aspect ratio increases, the three critical values shift to higher spin ratios. Within the specified parameter ranges, eight distinct vortex shedding modes are identified, evolving with changes in aspect ratio and spin ratio. These modes mainly include various combinations of hairpin, tip, streamwise elongated, and ring-shaped vortices. The results demonstrate that, when the aspect ratio decreases or the spin ratio increases, the weak influence region of end effects on the sectional aerodynamic coefficients diminishes and even completely disappears, while the strong influence region expands. More precisely, for the ranges of specified parameters, when the aspect ratio becomes greater than 10, the influence range of end effects is mainly controlled by the spin ratio.

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Effects of free tip shape and aspect ratio on flow around a finite cylinder with two free tips at subcritical Reynolds numbers

Cited by 2 publications

References 38 publications

Numerical investigation on the end effects of the flow past a finite rotating circular cylinder with two free ends

Numerical investigation on the end effects of the flow past a finite rotating circular cylinder with two free ends

Coupling impacts of end effects and rotation on the three-dimensional flow around a rapidly rotating circular cylinder with two flat ends

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