Large eddy simulation of flow characteristics around a twisted cylinder

被引：0
|
作者：
Guo C. [1 ]
Guo H. [1 ]
Hu J. [1 ]
机构：
[1] College of Shipbuilding Engineering, Harbin Engineering University, Harbin
来源：
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2021年 / 42卷 / 03期
关键词：
Drag reduction; Large eddy simulation; Lift fluctuation; Reynolds number; Separated shear layer; Turbulent flow; Vortex shedding; Vortex-induced vibration;
D O I：
10.11990/jheu.201910030
中图分类号：
学科分类号：
摘要：
In order to effectively limit the damage of vortex-induced vibrations on marine platforms and risers, it is necessary to further study the characteristics of wake flow around a cylinder. In this paper, a large eddy simulation method is adopted to simulate the turbulent flow around twisted cylinders with different twist angles α at Reynolds number Re=28 712. Compared with the results of a smooth cylinder, it is found that the suppression effect of the twisted cylinder on drag and lift reaches a maximum when α=40°, and the corresponding vortex formation length increases significantly. Meanwhile, the circumferential minimum pressure coefficient is greater than that of the smooth cylinder, which also provides a greater drag reduction for the twisted cylinder. The turbulent kinetic energy distributions and wake vortex structures of the twisted cylinder indicate that the extended length of the separated shear layer and wake shedding position is larger than that of the smooth cylinder. The vorticity value and vortex fluctuation amplitude in the near wake region of the twisted cylinder decreases, ultimately leading to the reduction in fluctuation amplitudes of drag and lift. Copyright ©2021 Journal of Harbin Engineering University.
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页码：331 / 338
页数：7
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