不同排列方式和间隙比下双圆柱流致振动特性研究
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摘要
采用基于ALE的流固耦合分析方法,将圆柱体振动模型简化为平面双自由度质量-弹簧-阻尼系统,进行了计算参数无关性分析。对不同θ角和间隙比T下的双圆柱流致振动进行数值模拟,并与单圆柱振动计算结果进行比较,得到了不同θ角和间隙比T下中心圆柱的升阻力系数、流场分布和运动轨迹变化情况。通过分析发现小间隙比下由于两圆柱间的相互干扰,改变了中心圆柱的尾涡结构,导致了升力和阻力系数随不同θ角而发生变化;小间隙比下由于两圆柱间的相互干扰影响,均使中心圆柱的轨迹在不同θ角下发生了较大的变化,顺流向的振动频率与单圆柱振动时相比出现了多倍频,导致其运动轨迹发生了变化。
Based on the fluid-solid coupling analysis method of ALE, the cylinder vibration model is simplified as a planar mass-spring-damper system of two-degree of freedom. A calculation of parameter independence analysis is performed. The flow-induced vibration of the two circular cylinders are simulated under various angles θ and the spacing ratios T. The θ angle changes between 0 ° ~180 ° and the spacing ratio T changes between 1.5 ~ 4.5. The results are compared with single cylinder vibration to get the changes of the lift and drag coefficient,flow field and the trajectory of the center of the cylinder. The results show that,at the small spacing ratios,the change of the lift and drag coefficient under various angles θ is mainly due to the change of the tail vortex structure,which is caused by the mutual interaction between the two cylinders. Due to the mutual interference between the two cylinders,the trajectory of the central cylinder under various angles θ is changed greatly under the small spacing ratios. The vibration frequency of the downstream flow is multiple more than the single cylinder,which results in the variation of the movement trajectory.
Based on the fluid-solid coupling analysis method of ALE, the cylinder vibration model is simplified as a planar mass-spring-damper system of two-degree of freedom. A calculation of parameter independence analysis is performed. The flow-induced vibration of the two circular cylinders are simulated under various angles θ and the spacing ratios T. The θ angle changes between 0 ° ~180 ° and the spacing ratio T changes between 1.5 ~ 4.5. The results are compared with single cylinder vibration to get the changes of the lift and drag coefficient,flow field and the trajectory of the center of the cylinder. The results show that,at the small spacing ratios,the change of the lift and drag coefficient under various angles θ is mainly due to the change of the tail vortex structure,which is caused by the mutual interaction between the two cylinders. Due to the mutual interference between the two cylinders,the trajectory of the central cylinder under various angles θ is changed greatly under the small spacing ratios. The vibration frequency of the downstream flow is multiple more than the single cylinder,which results in the variation of the movement trajectory.
引文
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[9]ZDRAVKOVICH M M,BEARMAN P W.Flow around circular cylinders—volume 1:fundamentals[J].Journal of Fluids Engineering,1997,120(1):105-106.
[10]BLOOR M S.The transition to turbulence in the wake of a circular cylinder[J].Journal of Fluid Mechanics,2006,19(2):290-304.
[11]翟云贺,康庄,宋环峰,等.基于Open FOAM低质量比圆柱体双自由度涡激振动的数值研究[J].中国造船,2017,58(2):19-29.(ZHAI Yunhe,KANG Zhuang,SONG Huanfeng.Numerical simulation of vortex-induced vibration of a circular cylinder with two-degree of freedom and low mass ratio based on Open FOAM[J].Shipbuilding of China,2017,58(2):19-29.(in Chinese))
[2]ZDRAVKOVICH M M.Review of interference-induced oscillations in flow past two parallel circular cylinders in various arrangements[J].Journal of Wind Engineering&Industrial Aerodynamics,1988,28(1-3):183-199.
[3]廖俊,景思睿.高雷诺数下双圆柱绕流的数值模拟[J].水动力学研究与进展,2001,16(1):101-110.(LIAO Jun,JING Sirui.Numerical simulation of flow around two cylinders at high Reynolds number[J].Chinese Journal of Hydrodynamics,2001,16(1):101-110.(in Chinese))
[4]滕丽娟.双圆柱在不同排列方式下绕流流态模拟[J].水科学与工程技术,2016(4):39-41.(TENG Lijuan.Simulation of flow around two cylinders under different arrangements[J].Water Sciences and Engineering Technology,2016(4):39-41.(in Chinese))
[5]贾晓荷,刘桦.双圆柱绕流的大涡模拟[J].水动力学研究与进展,2008,23(6):625-632.(JIA Xiaohe,LIU Hua.Large eddy simulation of flow around two circular cylinders[J].Chinese Journal of Hydrodynamics,2008,23(6):625-632.(in Chinese))
[6]梁文洲.不同排列方式下双圆柱体双自由度涡激振动试验研究[D].哈尔滨:哈尔滨工程大学,2012.(LIANG Wenzhou.The vortex-induced vibration experiment research of two cylinders with two degree freedoms in different arrangements[D].Harbin:Harbin Engineering University,2012.(in Chinese))
[7]冯志鹏,臧峰刚,张毅雄.两交错排列弹性管的流致振动特性研究[J].应用力学学报,2015(1):1-5.(FENG Zhipeng,ZANG Fenggang,ZHANGYixiong.Investigation of flow induced vibration characteristics in two staggered flexible tubes[J].Chinese Journal of Applied Mechanics,2015(1):1-5.(in Chinese))
[8]卞正宁,罗建辉.高雷诺数下高质量比圆柱涡致振动的数值模拟[J].工程力学,2015,32(6):200-206.(BIAN Zhengning,LUO Jianhui.Numerical VIV simulation of circular cylinder at high mass ratio and high Reynolds number[J].Engineering Mechanics,2015,32(6):200-206.(in Chinese))
[9]ZDRAVKOVICH M M,BEARMAN P W.Flow around circular cylinders—volume 1:fundamentals[J].Journal of Fluids Engineering,1997,120(1):105-106.
[10]BLOOR M S.The transition to turbulence in the wake of a circular cylinder[J].Journal of Fluid Mechanics,2006,19(2):290-304.
[11]翟云贺,康庄,宋环峰,等.基于Open FOAM低质量比圆柱体双自由度涡激振动的数值研究[J].中国造船,2017,58(2):19-29.(ZHAI Yunhe,KANG Zhuang,SONG Huanfeng.Numerical simulation of vortex-induced vibration of a circular cylinder with two-degree of freedom and low mass ratio based on Open FOAM[J].Shipbuilding of China,2017,58(2):19-29.(in Chinese))