两不等直径圆柱高雷诺数时均风力场的数值模拟

圆柱间气动干扰研究具有重要的理论和现实意义.尽管国内外开展了圆柱组合风效应的风洞试验研究,但主要针对等直径圆柱,并且雷诺数多为10~5以下.考虑到工程结构风场的高雷诺数特征,采用数值模拟方法,模拟两不等直径圆柱在串列、并列及交错排列下的高雷诺数(Re=4.5×10~5)时均绕流场.通过改变组合的间距和风向,分析探讨两柱阻力、升力及总风力的变化规律.

NUMERICAL SIMULATION OF TIME-AVERAGED WIND FORCES ON TWO CYLINDERS OF UNEQUAL-DIAMETER AT HIGH REYNOLDS NUMBER

The aerodynamic interference between cylinders is a topic of great theoretical and practical significance. Though some wind tunnel tests related to wind pressure distribution on cylinders complex have been carried out at home and abroad, only cylinders of equal-diameter and Reynolds number below 10$^{5}$ are considered. However, actual engineering structures are often immersed in wind flows of high Reynolds number. This paper studies the time-averaged flow at high Reynolds number ($Re=4.5\times 10^{5})$ around two cylinders of unequal-diameter, combined in tandem, side-by-side and in staggered styles, which is simulated by numerical methods, for various spacings and wind directions. The time-averaged drag, lift and resultant wind forces on two cylinders are obtained and analyzed. Which may serve as a reference for wind-resistant design for similar structures.