A Lagrangian criterion of unsteady flow separation for two-dimensional periodic flows

被引：0
|
作者：
Shuaibin HAN [1 ]
Shuhai ZHANG [1 ]
Hanxin ZHANG [2 ]
机构：
[1] State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center
[2] China Aerodynamics Research and Development Center
来源：
Applied Mathematics and Mechanics(English Edition) | 2018年 / 39卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Lagrangian criterion; unsteady flow separation; finite-time Lyapunov exponent(FTLE); two-dimensional periodic flow;
D O I：
暂无
中图分类号：
O35 [流体力学];
学科分类号：
080103 ; 080704 ;
摘要：
The present paper proposes a Lagrangian criterion of unsteady flow separation for two-dimensional periodic flows based on the principle of weighted averaging zero skin-friction given by Haller(HALLER, G. Exact theory of unsteady separation for two-dimensional flows. Journal of Fluid Mechanics, 512, 257–311(2004)). By analyzing the distribution of the finite-time Lyapunov exponent(FTLE) along the no-slip wall, it can be found that the periodic separation takes place at the point of the zero FTLE.This new criterion is verified with an analytical solution of the separation bubble and a numerical simulation of lid-driven cavity flows.
引用
收藏
页码：1007 / 1018
页数：12
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