不同长细比圆柱绕流的大涡模拟  

Large eddy simulation of flow around the cylinders with different aspects

作　　者：端木玉[1,2] 万德成[1] 

机构地区：[1]上海交通大学,船舶海洋与建筑工程学院,海洋工程国家重点实验室,高新船舶与深海开发装备协同创新中心,上海200240 [2]江苏海事职业技术学院,船舶与港口工程系,南京211170

出　　处：《水动力学研究与进展（A辑）》2016年第3期295-302,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金项目(51379125,51490675,11432009,51579145,11272120);长江学者奖励计划(T2014099);上海东方学者特聘教授岗位跟踪计划(2013022)

摘　　要：自从人们对层流圆柱绕流现象有了系列研究及清楚的认识后,逐渐把目光投向湍流的圆柱绕流问题,但高雷诺数下的圆柱绕流具有很强的三维特性,因此在数值计算时模型轴向长度的选取是大家关心的问题。该文基于开源软件OpenFOAM运用LES计算了4种不同长细比圆柱的静止圆柱绕流(包括一个二维算例),重点分析和对比了结果中的一些基础参数如St数、平均阻力系数等,与实验结果吻合良好。文中还进一步分析了时均顺流向速度U在流场中沿流向和横向的分布,发现长细比为π的圆柱算例中,计算域的轴向尺度已经能满足圆柱下游靠近圆柱处的流场中的三维结构的发展。As the previous studies have significantly advanced our knowledge about the laminar flow around a cylinder, the recent research interest focuses on turbulent flow cases. However, the wake of turbulence flow around a cylinder at high Reynoldsnumber is three-dimensional, unstable, irregular, random flow with rotation. Thus, it is of common concern to choose a proper axial length of the model cylinder during the simulation. This paper presents simulations of turbulence flow around cylinders with four different aspects （include a 2D case） by use of large eddy simulation solver in OpenFOAM. And highlight analyses of computational parameters, such as Strouhal number, time-averaged drag coefficient and so on, show good agreement with the experiment. The distribution of time-averaged streamwise velocity U along both streamwise direction and cross-flow direction are analyzed. The results show that in case of a cylinder with aspect ratio of π, the spanwise scale of the computation domain is large enough to satisfy the development of 3D structure of fluid field in the wake near cylinders.

关 键 词：不同长细比 大涡模拟 圆柱绕流 OPENFOAM 尾流分析 

分 类 号：U661.1[交通运输工程—船舶及航道工程]