分离板对圆柱体涡激振动特性影响的数值分析  

Numerical Study on Influence of Attached Rigid Splitter Plate on Vortex-Induced Vibration of Cylinder

作　　者：戴绍仕[1] 张旭阳 翟田磊 王芳咏[3] DAI Shaoshi;ZHANG Xuyang;ZHAI Tianlei;WANG Fangyong(College of Shipbuilding Engineering,Harbin Engineering University,Harbin 150001,Heilongjiang,China;Hangzhou Applied Acoustics Research Institute,Hangzhou 310000,Zhejiang,China;School of Engineering and Technology,Northeast Forestry University,Harbin 150040,Heilongjiang,China)

机构地区：[1]哈尔滨工程大学船舶工程学院,黑龙江哈尔滨150001 [2]杭州应用声学研究所,浙江杭州310000 [3]东北林业大学工程技术学院,黑龙江哈尔滨150040

出　　处：《华南理工大学学报（自然科学版）》2022年第10期41-50,共10页Journal of South China University of Technology(Natural Science Edition)

基　　金：黑龙江省自然科学基金资助项目(LH2019E026);黑龙江省重点专项配套项目(GJ2018GJ0036)。

摘　　要：圆柱形结构广泛地存在于自然界及工程界中,因粘性流动分离所诱发的涡激振动抑制问题一直备受国内外学者的密切关注。分离板作为常用的被动流动控制装置,其对圆柱形结构涡激振动的影响和抑制的内在机理还尚待开展深入的研究。文中基于升力振子模型和分离涡法(DES),结合异步迭代算法,采用SIMPLE算法和Newmark-β法对离散的流体和结构方程进行强耦合的数值求解。数值验证了基于分离涡强耦合算法的准确性,开展了不同约化速度下(0<U*<16.67)分离板(无因次流向长度L/D=0.5)对圆柱体单自由度涡激振动的影响研究,讨论分析了分离板对圆柱体尾涡模式、流体力响应、振动响应和频率特性的抑制效果,获得了临界流速。数值研究结果表明:当U*<10时,分离板对圆柱结构的涡激振动有显著的抑制作用,圆柱结构的最大振幅降低了约69%,频率锁定区域变窄,同时旋涡发放频率也明显下降,圆柱结构受到的平均阻力系数、均方根阻力系数和均方根升力系数分别降低了约40%、90%和52%;当U*>10时,分离板的存在会引起显著的驰振现象,圆柱振幅不断地增大;随U*的继续增加,剪切层在分离后又重新附着在分离板上,圆柱从水流中吸取能量且其远大于结构阻尼所消耗的能量,振幅继续增加并超过了光滑圆柱的振幅,圆柱振动显著加剧,分离板不能起到抑制圆柱振动的作用。Cylindrical structures exist widely in nature and engineering.The problem of suppression of vortexinduced vibration of cylindrical structures caused by viscous flow separation has received close attention in past decades.Splitter plate is commonly used as a passive control device due to its effective suppression of vortex shedding,but it is worth of further research about its influence on the VIV of circular cylinder and internal mechanism of VIV suppression.Herein,combining with lift oscillator model and Detached Eddy Simulation turbulence model(DES)and adapting asynchronous iterative algorithm,numerical computation of strong coupling resolved method were carried out by using SIMPLE algorithm and Newmark-βmethod to solve the discrete fluid and structural equations.The accuracy of the strong coupling algorithm based on Detached Eddy Simulation was verified,and then the effect of suppression of splitter plate(L/D=0.5)on a cylinder with single degree of freedom vibration was studied when the range of reduced velocity was 0<U*<16.67.Moreover,the suppression effect of the splitter plate on the wake mode,responses of fluid force and vibration,and frequency characteristics of vibrating cylinder was analyzed.The critical velocity was obtained.The numerical results show that the vibration can be well suppressed when U*<10.The maximum vibration amplitude decreases about 69%,lock-in region of frequency becomes narrow and the vortex shedding frequency decreases obviously.The maximum fluid parameters CD,mean,CD,rmsand CL,rms,acting on the cylinder,decrease about 40%,90%and 52%respectively.For cylinder attached a splitter plate,galloping phenomenon occurs as U*>10.The vibration amplitude of the cylinder keeps increasing.With the continuous increase of U*,the separating shear layer reattaches to the splitter plate again,and the cylinder absorbs energy from the flow,which was far greater than the energy consumed by structural damping.The amplitude continues to increase and exceeded that of the smooth cylinder,so the vibration

关 键 词：圆柱 涡激振动 分离板 强耦合 分离涡法 

分 类 号：U661.4[交通运输工程—船舶及航道工程]