三角分布的海洋立管涡激振动数值分析  

Numerical simulation for vortex-induced vibration of marine risers with triangular distribution

作　　者：张猛[1] 刘冉 赵桂峰[1] 王军雷[2] ZHANG Meng;LIU Ran;ZHAO Guifeng;WANG Junlei(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Chemical Engineering and Energy,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学土木工程学院,郑州450001 [2]郑州大学化工与能源学院,郑州450001

出　　处：《振动与冲击》2019年第19期123-130,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51578512; 51606171)

摘　　要：基于格子Boltzmann粒子网格技术,采用XFlow求解器对三角分布的海洋立管进行涡激振动数值模拟。运用二阶范德波尔方程描述二维圆柱横向单自由度涡激振动,研究了三圆柱间距比及来流约化速度对圆柱涡激振动特性的影响,圆柱间距比取L/D=0.5、2.0、4.0,来流约化速度为U r=1~9;分析了圆柱涡激振动的振幅、升阻力系数特性及圆柱尾流中旋涡脱落模式。结果表明:圆柱间距比为L/D=0.5、2.0、4.0时对应的上游圆柱涡激振动的锁振区间分别为U r=3.5~7.0、3.5~7.5、3.5~6.0,最大振幅分别为Y rms/D=0.372,0.546,0.470。间距比过大或过小时,其流体流动模式分别受接近效应和尾流效应的影响,中间间距比时,在非锁振区间内,其流体流动模式受两者组合效应的共同影响,在锁振区间,其流体流动模式同大间距比一样主要受尾流效应的影响;流体干涉效应的变化对圆柱升阻力系数的变化起着重要的作用,不同间距比,圆柱升阻力系数的变化趋势相似。Numerical simulation for vortex-induced vibration(VIV)of marine risers with triangular distribution was performed using XFlow solver based on the lattice Boltzmann particle grid technique.Transverse single-DOF VIV of a 2-D cylinder was described using the second order van der Pol equation,and effects of 3 cylinders’spacing ratio and incoming flow reduction speed on VIV features of cylinders were studied.The cylinders’spacing ratio L/D=0.5,2.0 and 4.0,and the incoming flow reduction speed U r=1-9.VIV amplitude of cylinders,features of lift-drag coefficient and vortex shedding mode in wake of cylinders were analyzed.The results showed that when cylinder spacing ratio L/D=0.5,2.0,and 4.0,upstream cylinder VIV’s locking vibration interval U r=3.5-7.0,3.5-7.5 and 3.5-6.0,respectively,the maximum amplitude Y rms/D=0.372,0.546 and 0.470,respectively;when cylinder spacing ratio is too big or too small,fluid flow mode is affected by proximity effect and wake effect,respectively;with medium spacing ratio,within a non-locking vibration interval,fluid flow mode is affected by combination of above two effects;within a locking vibration interval,fluid flow mode is mainly affected by wake effect;change of fluid interference effect significantly affects change of cylinder lift-drag coefficient;with different spacing ratios,change trends of cylinder lift-drag coefficient are similar.

关 键 词：海洋立管 涡激振动 流固耦合 三角分布 

分 类 号：TV131.2[水利工程—水力学及河流动力学]