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带多个脉冲扰动的湍流斑演化

发表时间:2012-02-15  浏览量:1081  下载量:450
全部作者: 张立,唐登斌
作者单位: 南京航空航天大学航空宇航学院;空军第十三飞行学院教研室
摘 要: 提出以多个脉冲形式的壁面扰动为初始模型,通过Navier-Stokes(N-S)方程的直接数值模拟研究多湍流斑的生成和非线性演化问题。发展了高精度、高效稳定的数值方法,满足在边界上的无反射和压力条件。以槽道流动为例的研究结果表明:多个湍流斑的生成、干扰和演化过程十分复杂,随着扰动的发展,展示了湍流斑内的涡系形成、脉动增强等湍流的基本特征,而在湍流斑演化过程中,非线性作用是关键因素。
关 键 词: 流体力学;湍流斑;非线性演化;直接数值模拟;多个脉冲扰动;初始模型
Title: Studies of turbulent spots evolution with multiple pulse disturbances
Author: ZHANG Li, TANG Dengbin
Organization: College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics; Teaching and Research Section, The Thirteenth Flight Academy
Abstract: The multiple initial disturbance models with the wall pulse form are proposed, and the generation and nonlinear evolution of turbulent spots are studied by the direct numerical simulation of Navier-Stokes equations. Numerical schemes with high accuracy and efficiency and stability are developed, and the non-reflecting and pressure conditions are satisfied in the boundary. The computed results in channel flows show clearly that the generation, interaction and evolution process of turbulent spots are very complicated, and the basic characteristics of the turbulent spots including the formation of vortices and the increase of physical impulses are demonstrated with the enhancement of disturbances. Specially, nonlinear effects are the key problem in the evolution process of the turbulent spots.
Key words: fluid mechanics; turbulent spots; nonlinear evolution; direct numerical simulation; multiple pulse disturbance; initial model
发表期数: 2012年2月第3期
引用格式: 张立,唐登斌. 带多个脉冲扰动的湍流斑演化[J]. 中国科技论文在线精品论文,2012,5(3):243-249.
 
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