细长柔性波浪柱流致振动高保真数值模拟研究  

High Fidelity Numerical Simulation of Fluid-Induced Vibration of Slender Flexible Wavy Cylinder

作　　者：庞玺源 朱宏博 张春晓 包艳[1] PANG Xiyuan;ZHU Hongbo;ZHANG Chunxiao;BAO Yan(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Inner Mongolia Road&Bridge Group Co.,Ltd.,Hohhot 010000,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]内蒙古路桥集团有限责任公司,内蒙古呼和浩特010000

出　　处：《甘肃科学学报》2023年第2期107-114,130,共9页Journal of Gansu Sciences

摘　　要：波浪柱具有良好的减阻减振效果,在海洋工程和桥梁工程中应用广泛。为了研究低雷诺数均匀流下细长柔性波浪柱的流致振动特性,选取了3种不同波高的截面直径呈正弦变化的波浪柱,分别给予其驻波和行波的初始激励,对其动力特性和尾流特征进行分析,并与同等条件下的光滑直圆柱进行了对比。研究结果表明,柔性波浪柱在驻波和行波初始激励下的流致振动特性有很大差别:在驻波激励下,当波高≥0.2 D时,波浪柱振动得到了很好的控制,这主要归功于波浪柱的特殊结构防止了剪切层与强度较高的涡结构发生掺混,增大了漩涡生成长度;而在行波初始激励下,波浪柱的控制效果有限,局部雷诺数主导了结构响应、尾流模式和展向变化特征。Wavy cylinders are widely used in ocean engineering and bridge engineering for its good effect of drag and vibration reduction.In order to study the fluid-induced vibration characteristics of slender flexible wavy cylinder under low Reynolds number uniform flow,three flexible cylinders with sinusoidal wavy surfaces of different wave heights were selected,the initial excitation of standing wave and traveling wave are given to them respectively.Their dynamic characteristics and wake characteristics were analyzed,and smooth straight cylinders under the same conditions were compared.The results show that the fluid-induced vibration characteristics of flexible wavy cylinders under the initial excitation of standing wave and traveling wave are very different.Under the standing wave excitation,when the wave heights are greater than or equal to 0.2D,the wavy cylinders vibrations are well controlled.This is mainly attributed to the special structure of wavy cylinders,which prevents the mixing between shear layer and vortex struc-tures with high strength and increases the vortex formation lengths.However,under the initial excitation of traveling wave,the control effects of wavy cylinders are limited,and the local Reynolds number dominates the structural response,wake mode and span variation characteristics.

关 键 词：低雷诺数 柔性波浪柱 流致振动 驻波 行波 动力特性 尾流特征 

分 类 号：O351.3[理学—流体力学]