STUDY ON TURBULENT SPOTS IN PLANE COUETTE FLOW  

平面COUETTE流动的湍流斑研究(英文)

作　　者：陈林[1] 唐登斌[1] 

机构地区：[1]南京航空航天大学航空宇航学院

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2007年第3期211-217,共7页南京航空航天大学学报（英文版）

基　　金：国家自然科学基金(10772082)资助项目~~

摘　　要：Turbulent spots play a key role in the formation of the turbulence and the transition. The generation and evolution of turbulent spots using the wall impulse model in the plane Couette flow are studied by direct numerical simulation of Navier-Stokes equations. A group of three-dimensional coupling compact difference schemes with high accuracy and high resolution is used in the numerical calculation. The important characteristics of turbulent spots based on the results of examples are analyzed, including the formation of random pulse, the generation of Reynolds stress, the growth of disturbance amplitude, and the continuous change of spot shape, especially the complex evolution process of the streamwise vortices. Computational results confirm that basic properties of turbulent spots in the laminar flow are similar to those in the turbulent flow.湍流斑是近壁剪切流动中的重要现象,它们的生成和发展与流动转捩和湍流的形成密切相关。采用Navier-Stokes方程直接数值模拟和壁面脉冲模型研究平面Cou-ette流动中湍流斑的生成和演化。高精度高分辨率的三维耦合紧致差分格式被用于数值计算。探讨了平面Couette流动中湍流斑的重要特征,包括高频脉动的形成、雷诺应力的产生、扰动的急剧增长和湍流斑形状的变化,特别是流向涡的复杂演化过程。结果表明层流流动中的湍流斑具有湍流流动中一些基本特征。

关 键 词：turbulent spot streamwise vortex Couette flow direct numerical simulation 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程] O357[理学—流体力学]