前缘倒圆角方柱绕流的大涡模拟  

Large eddy simulation of flow past a square cylinder with rounded leading corners

作　　者：姚世传 施鎏鎏 郭鹏 YAO Shi-chuan;SHI Liu-liu;GUO Peng(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《水动力学研究与进展（A辑）》2018年第4期522-529,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金项目(11602143);上海高校青年教师培养资助计划(slg16004)~~

摘　　要：该文基于FLUENT软件采用大涡模拟方法对前缘倒圆角方柱绕流的气动特性进行数值研究。首先分析网格质量对二维大涡模拟结果准确度的影响,得出适用于钝体绕流大涡模拟计算的网格标准;然后对比二维和三维大涡模拟计算的升阻力系数、脱落涡频率、回流区长度和瞬态流场旋涡结构,以及尾迹速度分布,并与实验结果对比。最后得到二维和三维大涡模拟方法在钝体绕流非定常特性研究中的适用性。结果表明:二维和三维大涡模拟均能捕捉流场中大尺度旋涡结构,预测的脱落涡频率与实验偏差均小于0.4%;三维大涡模拟结果相比于二维大涡模拟与实验结果更加吻合。The aerodynamic performance and unsteady flow past a square cylinder with rounded leading corners is studied by two-dimensional（2D） and three-dimensional（3D） large eddy simulation（LES） methods in FLUENT software.The effect of grids quality on the 2D LES results is studied firstly,and a suitable grid is selected to use in the 3D LES.The aerodynamic performance,such as drag and lift coefficient,frequency of vortex shedding,length of recirculation zone,instantaneous vorticity and velocity distribution in the wake,are compared between 2D LES and 3D LES with previous experiment results.The results show that the comparison of vortex shedding frequency between 2D LES and 3D LES with experiment results are both less than 0.4 percent,because of best prediction in large scale vortex structure in the flow field with 2D and 3D LES models.It is found that the 3D LES results are in consistent with the experiment measurement,while it is greatly shortened in 2D LES.

关 键 词：倒圆角方柱 大涡模拟 气动性能 旋涡结构 升阻力系数 

分 类 号：O357[理学—流体力学]