摘要
采用根据共振三波理论模型建立的初始准二维流场和直接数值模拟方法,对湍流边界层近壁区流向涡的生成进行了研究.计算得到了准流向发卡涡和次生准流向涡结构的生成过程及其主要特征,讨论了它们的产生机理.作为相干结构的主要特征,利用共振三波理论模型对流向涡结构生成与演化过程的研究为湍流边界层内相干结构的研究与流动控制提供了新的途径和思路.
A mechanism for generation of near wall quasi-streamwise hairpin-like vortex （QHV） and secondary quasi-streamwise vortices （SQV） is presented. The conceptual model of resonant triad in the theory of hydrodynamic instability and direct numerical simulation of a turbulent boundary layer were applied to reveal the formation of QHV and SQV. The generation procedures and the characteristics of the vortex structures are obtained, which share some similarities with previous numerical simulations. The research using resonant triad conceptual model and numerical simulation provides a possibility for investigating and controlling the vortex structures, which play a dominant role in the evolution of coherent structures in the near-wall region.
出处
《应用数学和力学》
CSCD
北大核心
2008年第1期13-20,共8页
Applied Mathematics and Mechanics
基金
国家自然科学基金资助项目(50476004
10732090)
关键词
湍流
边界层
相干结构
数值模拟
流向涡
turbulence
boundary layer
coherent structure
computer simulation
streamwise vortex
