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Article

A Study of Drag Reduction on Cylinders with Different V-Groove Depths on the Surface

by 1, 1, 2 and 1,*
1
School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China
2
Department of Metallurgy and Automotive Engineering, Shandong Vocational College of Industry, Zibo 256414, China
*
Author to whom correspondence should be addressed.
Academic Editor: Giuseppe Pezzinga
Water 2022, 14(1), 36; https://doi.org/10.3390/w14010036
Received: 23 November 2021 / Revised: 21 December 2021 / Accepted: 22 December 2021 / Published: 24 December 2021
(This article belongs to the Section Hydraulics and Hydrodynamics)
In this study, the drag reduction effect is studied for a cylinder with different V-groove depths on its surface using a k-ω/SST (Shear Stress Transport) turbulence model of computational fluid dynamics (CFD), while a particle image velocimetry (PIV) system is employed to analyze the wake characteristics for a smooth cylinder and a cylinder with different V-groove depths on its surface at different Reynolds numbers. The study focuses on the characteristics of the different V-groove depths on lift coefficient, drag coefficient, the velocity distribution of flow field, pressure coefficient, vortex shedding, and vortex structure. In comparison with a smooth cylinder, the lift coefficient and drag coefficient can be reduced for a cylinder with different V-groove depths on its surface, and the maximum reduction rates of lift coefficient and drag coefficient are about 34.4% and 16%, respectively. Otherwise, the vortex structure presents a complete symmetry for the smooth cylinder, however, the symmetry of the vortex structure becomes insignificant for the V-shaped groove structure with different depths. This is also an important reason for the drag reduction effect of a cylinder with a V-groove surface. View Full-Text
Keywords: flow around a cylinder; V-groove; drag reduction; particle image velocimetry; vortex structure flow around a cylinder; V-groove; drag reduction; particle image velocimetry; vortex structure
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MDPI and ACS Style

Qi, J.; Qi, Y.; Chen, Q.; Yan, F. A Study of Drag Reduction on Cylinders with Different V-Groove Depths on the Surface. Water 2022, 14, 36. https://doi.org/10.3390/w14010036

AMA Style

Qi J, Qi Y, Chen Q, Yan F. A Study of Drag Reduction on Cylinders with Different V-Groove Depths on the Surface. Water. 2022; 14(1):36. https://doi.org/10.3390/w14010036

Chicago/Turabian Style

Qi, Jiyang, Yue Qi, Qunyan Chen, and Fei Yan. 2022. "A Study of Drag Reduction on Cylinders with Different V-Groove Depths on the Surface" Water 14, no. 1: 36. https://doi.org/10.3390/w14010036

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