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湍流斑流场的非线性特征研究

发表时间:2011-08-15  浏览量:1367  下载量:469
全部作者: 杨颖朝,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: 采用精确的直接数值模拟方法,研究转捩流场中湍流斑的形成和发展。湍流斑是具有某些湍流特征的孤立局部区域,其周围流动为层流流动, 但在区域内部却具有随机脉动和复杂旋涡等湍流特征。建立具有高分辨率的高精度三维耦合中心差分格式,与时间分裂法、高阶迎风差分格式一起组成高效的高阶紧致差分方法,可用于包括边界邻域在内的整个计算区域。设计扰动源分布和改变扰动值,通过数值模拟研究其脉动幅值的增长、扰动能量的分布、雷诺应力的产生、涡系的形成和干扰等湍流斑流场的非线性特性。计算结果表明:当多湍流斑相交后,非线性作用的增强成了多湍流斑流场的主要特征。
关 键 词: 流体力学;湍流斑;随机脉动;雷诺应力;非线性特征;直接数值模拟
Title: Stwdy on nonlinear characteristics of turbulent spot flow�fields
Author: YANG Yingzhao, TANG Dengbin
Organization: College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics; Teaching and Research Section, The Thirteenth Flight Academy
Abstract: The formation and development of turbulent spot flow�fields are researched by the direct numerical simulation of Navier�Stokes equations. The turbulent spots are the isolated local regions surrounded by laminar flows in the transitional late stage of the boundary layer, and possess some turbulent properties including the random pulse and complex vortices, etc. The high�order compact difference schemes with the high�resolution are constructed by the high�order three�dimensional coupling centric difference schemes combined with the time�splitting method and high�order upwind scheme. This method can be used in the all computational area including in the vicinity of the boundary. The distribution of the disturbances sources and the change of the disturbances values are designed in the paper. The computed results show clearly nonlinear properties of turbulent spot flow�fields, such as the increase of the pulse amplitude, the distribution of the disturbance energy, and the generation of Reynolds stress and vortices, and interaction, etc. The computed results show that, when turbulent spots intersect with each other, the nonlinear effect strengthening becomes a main characteristic of multiple turbulent spot flow fields.
Key words: fluid mechanics; turbulent spots; random pulse; Reynolds stress; nonlinear characteristics; direct numerical simulation
发表期数: 2011年8月第15期
引用格式: 杨颖朝,唐登斌. 湍流斑流场的非线性特征研究[J]. 中国科技论文在线精品论文,2011,4(15):1409-1417.
 
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