三维波浪-流-串行桩柱相互作用的数值分析  

Numerical study of three-dimensional wave-current interaction with cylinders

作　　者：谭长建[1,2] 祝兵[2] 

机构地区：[1]上海建科院上海市工程结构新技术重点实验室,上海200032 [2]西南交通大学土木工程学院,成都610031

出　　处：《应用力学学报》2010年第4期680-686,共7页Chinese Journal of Applied Mechanics

摘　　要：为探讨波浪-流-串行桩柱的相互作用,建立了三维数值模型,采用大涡模拟(LES)方法对湍流进行模拟。研究了波浪-流-串行桩柱相互作用下的拖曳系数,对波浪-流靠近结构时的非线性相互作用引起的拖曳力和涡的变化,以及在结构前后自由面的变化进行了分析,并且与波浪-流与孤立桩柱相互作用的研究进行比较。结果表明:由于桩柱的存在,在波浪-流的传播过程中出现了时间延迟,这就导致了桩柱前后附近自由面水位存在较大的位移差;由于桩柱之间互相干扰,下游桩柱的存在导致上游桩柱附近不能形成非对称的周期性涡脱落,上游桩柱横向拖曳力受到影响最大,顺方的拖曳力也受到明显影响;下游桩柱横向和顺向的拖曳力都受到较大的影响;同时涡的脱落会把其附近的自由面吸入。To investigate wave-current interaction with square cylinders,a three-dimensional numerical model is established.The model employs the large eddy simulation(LES) method to model the effect of small-scale turbulence.The drag coefficients of wave-current interaction with square cylinders,the drag force and vortex shedding caused by the non-linear wave-current interaction,the variety of the free surface on the front and rear sides of the cylinders and the correlation between the vortex shedding and free surface displace are respectively numerically simulated,and then,the results are compared with the ones of wave-current interaction with a square cylinder.The results show that there are time delays of wave propagation due to the presence of the square cylinders.Asymmetric period vortex shedding is not obtained on the rear side of the upriver cylinder because of the cylinders interfering with each other.The transverse drag force of the upriver cylinder is affected seriously,and the forward drag force of the upriver cylinder is affected obviously.The drag force in the transverse and forward of the downriver cylinder are also affected obviously.The vortex shedding can suck down the nearby free surface.

关 键 词：波浪-流-结构相互作用 数值模型 大涡模拟 拖曳力 涡脱落 自由面 

分 类 号：TV131.33[水利工程—水力学及河流动力学]