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平板边界层壁面局部脉冲激发大涡结构起因的数值模拟
引用本文:陆昌根,曹卫东,张艳梅,彭金涛.平板边界层壁面局部脉冲激发大涡结构起因的数值模拟[J].空气动力学学报,2008,26(1):61-66.
作者姓名:陆昌根  曹卫东  张艳梅  彭金涛
作者单位:1. 南京信息工程大学大气科学院,江苏,南京,210044;河海大学环境科学与工程学院,江苏,南京,210098
2. 河海大学环境科学与工程学院,江苏,南京,210098
基金项目:国家自然科学基金,江苏省自然科学基金
摘    要:构建了边界层壁面局部脉冲扰动诱导大涡结构的初始理论模型,采用直接数值模拟的方法,研究了边界层壁面局部脉冲激发大涡结构起因的问题.计算结果表明:局部脉冲激发大涡结构成因的许多特点,如幅值演化、雷诺切应力功率、高低速条纹结构、流向涡的产生、上喷和下扫过程、平均速度剖面存在的拐点和严重扭曲以及类似于发卡涡的特征等现象与实验结果和某些数值结果非常相似;另外,壁面局部脉冲的强度、影响区域、加载时间、分布方式对边界层流中大涡结构起因的特性起着决定性的作用,壁面脉冲也是边界层流中激发大涡结构的重要途径之一.

关 键 词:数值模拟  边界层  局部  脉冲  大涡结构
文章编号:0258-1825(2008)01-0061-06
收稿时间:2007-02-15
修稿时间:2007-09-12

Numerical simulation of inducing large eddies in boundary layer through local impulse at the wall
LU Chang-gen,CAO Wei-dong,ZHANG Yan-mei,PENG Jin-tao.Numerical simulation of inducing large eddies in boundary layer through local impulse at the wall[J].Acta Aerodynamica Sinica,2008,26(1):61-66.
Authors:LU Chang-gen  CAO Wei-dong  ZHANG Yan-mei  PENG Jin-tao
Abstract:Local impulse disturbance at the wall was designed as an initial theoritical model to induce large eddies in boundary layer,and cause of the large eddies was studied through numerical simulation.Results show that amplitudes evolution,Reynolds stress power,high and low speed stripe,formation of streamwise vortices,ejection and sweep,inflexions and distortion at the mean velocity profiles,as well as hairpinlike vortices are consistent with experimental and other stimulant conclusions.In addition,many factors to induce large eddies are of importance;such as impulse strength,influencing area,loading time and distributing type etc.Local impulse at the wall is a crucial approach to excite large eddies in boundary layer.
Keywords:numerical simulation  boundary layer  local  impulse  large eddies
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