期刊
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
卷 220, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jweia.2021.104839
关键词
Circular cylinder; Reattachment; Separation bubble; Critical Reynolds number; Aerodynamic forces
资金
- Natural Science Foundation of Hebei Province [E2021210053, E2019210031]
- Hebei Provincial Department of Science and Technology [206Z5401G]
- China Scholarship Council
This study investigates the aerodynamic characteristics of a circular cylinder in the critical Reynolds number range, revealing that reattachment only occurs along a certain length of the cylinder, inducing a strong three-dimensional flow state and corresponding aerodynamic force distribution. The reattachment also causes an unsteady variation in aerodynamic force, with the lift coefficient mainly dependent on the occurrence of a separation bubble and the motion of the reattachment point.
Details of the aerodynamic characteristics of a circular cylinder in the critical Reynolds number range remain unclear. A significant influencing factor is the occurrence of reattachment. A series of pressure measurements on a circular cylinder of finite length in the critical Reynolds number range, Re = 1.0 x 10(5)-4.6 x 10(5), is carried out in a wind tunnel to reveal the three-dimensional effects of reattachment on the aerodynamics, which cannot be observed by the two-dimensional simulation and significantly influence the estimation of the aerodynamics of slender structures. The results show that the flow can reattach along only a certain length of the cylinder instead of the entire length, inducing a strong three-dimensional flow state and corresponding aerodynamic force distribution. The reattachment also induces an unsteady variation in the aerodynamic force; the lift coefficient is mainly dependent on the occurrence of a separation bubble and the motion of the reattachment point.
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