转捩边界层中次生流向涡演化的数值研究  

Numerical Studies on Evolution of Secondary Streamwise Vortices in Transitional Boundary Layers

作　　者：陈林[1] 唐登斌[1] 刘超群 

机构地区：[1]南京航空航天大学空气动力学系,南京210016 [2]德州大学阿灵顿分校

出　　处：《应用数学和力学》2011年第4期428-436,共9页Applied Mathematics and Mechanics

基　　金：国家自然科学基金资助项目(10772082);AFOSR资助项目(FA9550-08-1-0201)

摘　　要：采用高精度直接数值模拟方法和高效的特征无反射边界条件,进行可压缩流转捩边界层中出现的次生流向涡演化的数值研究.精细的数值模拟结果清楚地揭示了转捩边界层的复杂流场中次生流向涡的形成和演化过程,探讨它对转捩至关重要的环状涡生成的影响,发现次生流向涡和主流向涡的共同作用形成环状涡的一种新机理.The formation and evolution of secondary streamwise vortices in the compressible transitional boundary layers over a flat-plate were studied by means of direct numerical simulation method with high order accuracy and high effective non-reflecting characteristic boundary conditions.The generation and development processes of the secondary streamwise vortices in the complicated transitional boundary flow are clearly analyzed based on the details of numerical results,and its effects on the formation of the ring-like vortex which is vital to the boundary layer transition are explored.A new mechanism forming the ring-like vortex through the mutual affection of the primary and secondary streamwise vortices is expressed.

关 键 词：次生流向涡 边界层 转捩 直接数值模拟 

分 类 号：O357.5[理学—流体力学]