摘要
基于大涡模拟(LES)方法对亚临界雷诺数(Re=3900)下三维串列双圆柱体绕流问题进行了数值计算。首先,通过求解单圆柱算例来验证计算模型及参数的正确性。然后,着重分析了不同间距比对双圆柱体的流体力系数的影响,并阐述了双圆柱体流场特性变化及其互扰效应内在机理。研究表明:雷诺数Re=3900时,串列双圆柱体绕流临界间距比在3.9~4.0之间;随着间距比的增加,双圆柱体临近流场中二次涡团形成的区域与三维涡结构均会发生变化,导致其结构表面所受的流体力系数在时间与空间上变化的规律性逐渐减弱;达到临界间距比时,流体力系数的变化会呈现出较强的规律性。
Based on the computational fluid dynamic theory,the flow past three-dimensional four circular cylinders in the square configuration have been investigated numerically under Re=3900 by using large eddy simulation(LES).The effects of spacing ratio and the incidence angle on the fluid force coefficients and flow patterns of four square-arranged circular cylinders are analyzed emphatically.Results indicate that the spacing ratio and the incidence angle have great influence on the fluid characteristics of four square-arranged circular cylinders.The critical spacing ratios of the flow around four circular cylinders with a square arrangement are 3.5(α=0°),4.0(α=22.5°)and 3.0(α=45.0°),respectively.The variation of the spacing ratio gives rise to the change of the pressure coefficient distribution on the surface of the downstream circular cylinder.On the other hand,at small spacing ratio,the interaction between the four cylinders is mainly the proximity effect.With the increasing of spacing ratio,the wake of the upstream cylinder has a significant effect on the downstream one,and the interaction between the cylinders transforms to the wake interference.
作者
涂佳黄
曹波
谭潇玲
梁经群
王志忠
王程
Tu Jiahuang;Cao Bo;Tan Xiaoling;Liang Jingqun;Wang Zhizhong;Wang Cheng(College of Civil Engineering and Mechanics,Xiangtan University,411105,Xiangtan,China;Hunan Key Laboratory of Geomechanics and Engineering Safety,411105,Xiangtan,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2019年第4期869-875,998,共8页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金青年项目(11602214)
中国博士后科学基金(2017M622593)
湖南省自然科学基金青年项目(2016JJ3117)
关键词
串列双圆柱
间距比
亚临界雷诺数
互扰效应
大涡模拟
four square-arranged circular cylinders
incidence angle
spacing ratio
fluid force coefficient
interference effect
