不同雷诺数下4∶1圆角矩形柱气动力特性及流场数值模拟研究  

LES STUDY ON AERODYNAMIC CHARACTERISTICS AND FLOW FIELD OF A 4∶1 RECTANGULAR CYLINDER WITH DIFFERENT REYNOLDS NUMBERS

作　　者：于春放 靖洪淼 张记涛 许浩然 乔明哲 刘庆宽 YU Chun-fang;JING Hong-miao;ZHANG Ji-tao;XU Hao-ran;QIAO Ming-zhe;LIU Qing-kuan(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;Department of Railway Engineering,Shijiazhuang Institute of Railway Technology,Shijiazhuang 050061,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [3]河北省风工程和风能利用工程技术创新中心,石家庄050043 [4]石家庄铁路职业技术学院铁道工程系,石家庄050061

出　　处：《工程力学》2024年第S01期332-338,共7页Engineering Mechanics

基　　金：国家自然科学基金青年项目(52208494);河北省自然科学基金青年项目(E2021210063);河北省自然科学基金创新研究群体项目(E2022210078);河北省高端人才项目(冀办[2019]63号);石家庄铁道大学研究生创新资助项目(YC2023065,YC2023068)。

摘　　要：圆角化处理的矩形柱绕流具有复杂的气动力和流场特性。为深入了解圆角矩形柱的雷诺数(Reynolds number, Re)效应,采用基于计算流体力学(Computational fluid dynamics, CFD)的大涡模拟(Large eddy simulation,LES)方法,开展了不同Re下宽高比4∶1圆角矩形柱绕流数值模拟,研究了不同Re下圆角矩形柱的气动力系数、斯特劳哈尔数(Strouhal number, St)、风压系数和流场等变化规律。结果表明:表面风压和时均流场在Re≤4×10^(3)时,Re效应显著,但当Re>4×10^(3)时,Re效应较弱。当Re≤4×10^(3)时,升力系数均方根和平均阻力系数随着Re先增大后减小,在Re=1×10^(3)时达到最大;而St先增大后减小再增大,分别在Re=2×10^(3)时达到最大,在Re=4×10^(3)时达到最小。回流长度随着Re先减小后增大,尾流旋涡中心逐渐后移。The aerodynamic characteristics and flow field of rectangular cylinder with rounded corner are very complex.To further understand the Reynolds number(Re)effect of rectangular cylinder with rounded corner,the large eddy simulations(LES)of flow around a 4∶1 rectangular cylinder with rounded corner under different Res are carried out,which are based on the computational fluid dynamics(CFD).The aerodynamic coefficient,Strouhal number(St),wind pressure coefficient and flow field under different Res are comprehensively studied.The results indicate that the surface pressure and time-averaged flow field are sensitive to Re when Re≤4×10^(3);however,they are insensitive to Re when Re>4×10^(3).In addition,when Re≤4×10^(3),the root mean square of lift coefficient and the mean drag coefficient increase and then decrease with Re,and they reach the maximum at Re=1×10^(3).Nevertheless,St first increases,then decreases and finally increases,and its maximum and minimum are at Re=2×10^(3) and 4×10^(3),respectively.With the increase of Re,the recirculation length first decreases and then increases,and the center of the wake vortex moves backward gradually.

关 键 词：4∶1圆角矩形柱 大涡模拟方法 雷诺数 气动力特性 流场 

分 类 号：O357.5[理学—流体力学]