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采用有限体积法对间距比为3.0,4.0,5.0的方形四立柱涡激运动特性进行了数值研究。着重探讨了间距比对振动幅值,升力系数频谱特性,涡脱模式的影响。引入动网格技术来实现立柱和流场之间的流—固耦合模拟。研究表明:三种间距比下,流向振幅随折合速度先增大后振荡。从升力系数谱分析,在不同折合速度下,系统能量出现多个或单个峰值,但能量相对仍比较集中。当间距比较小时,由于流场的干扰作用,柱体的尾涡结构凌乱而不规则;当间距比较大时,各柱体都有各自单独的涡街,但干扰现象依然存在。
The finite volume method was used to study the vortex characteristics of a square four-column with spacing ratio of 3.0,4.0,5.0. The effects of pitch ratio on vibration amplitude, lift coefficient spectrum characteristics and vortex shedding mode are mainly discussed. The introduction of moving grid technology to achieve the flow column between the flow field and the solid-state simulation. The results show that: the three kinds of spacing ratio, the flow amplitude with the rate of increase first increased after the oscillation. From the lift coefficient spectrum analysis, the system energy appears multiple or single peak at different folding speed, but the energy is still relatively concentrated. When the spacing is relatively small, the vortex structure of the cylinder is messy and irregular due to the disturbance of the flow field. When the spacing is relatively large, each cylinder has its own vortex street, but the interference phenomenon still exists.