摘要
基于计算流体力学技术开展了低雷诺数Re=150条件下串列双圆柱单自由度涡激振动的数值模拟研究,分析了不同间距比L/D=1.5~5.0、约化速度V_r=3~13条件下串列双圆柱结构动力响应和尾流旋涡脱落特性.结果表明间距比的变化改变下游圆柱锁定区间.对于各个间距比下的上游圆柱其动力响应和单圆柱涡激振动基本相同,而对于下游圆柱其动力响应明显与单圆柱不同.研究还发现存在一个临界约化速度V_(r,crit),当V_rV_(r,crit)时,下游圆柱振幅大于上游圆柱振幅.此外,文中还对不同间距比条件下上、下游圆柱尾流旋涡脱落形态展开了相应的研究.
In this paper,numerical simulations of vortex induced vibration for two tandem cylinders were carried out at Reynolds number Re = 150. The spacing ratio L/D( L is the center-to-center distance between the two cylinders,D is the cylinder diameter) varies from 1. 5 to 5. 0,and the variation of reduced velocities is in the range of 3 ≤V_r≤13. The effects of spacing ratio and reduced velocity on the dynamic response and vortex shedding patterns are investigated. The results show that the spacing ratio has a significant effect on the range of lock-in regon for downstream cylinder. The dynamic response of the upstream cylinder is found to be qualitatively similar to that of an isolated cylinder,while the response of downstream cylinder appears to be greatly amplified. It is also found that there exists a critical reduced velocity V_(r,crit). When V_r< V_(r,crit),the amplitude of upstream cylinder is larger than that of downstream cylinder,on the contrary,when V_r< V_(r,crit),the amplitude of downstream cylinder is larger than that of the upstream cylinder. Moreover,the vortex shedding patterns with variation of reduced velocities at different spacing ratios are investigated.
引文
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