期刊
JOURNAL OF FLUID MECHANICS
卷 728, 期 -, 页码 396-416出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2013.214
关键词
turbulent flows; turbulent boundary layers
资金
- National Science Foundation [CBET-1034581]
- NASA-Oregon Space Grant Consortium
- CEC 6th framework program [AST4-CT-2005-516008]
- Multiphase Flow Assurance Innovation Centre (FACE)
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1034581] Funding Source: National Science Foundation
Lagrangian coherent structures (LCS) of a turbulent boundary layer at Re theta of 9800 are identified in a plane parallel to the wall at y(+) = 50. Three-component high-speed stereo particle image velocimetry measurements on a two-dimensional rectangular plane are used for the analysis. The velocity field is extended in the streamwise direction, using Taylor's frozen field hypothesis. A computational approach utilizing the variational theory of hyperbolic Lagrangian coherent structures is applied to the domain and trajectories are computed using the extended field. The method identified both attracting and repelling Lagrangian coherent structures. There are no apparent differences in distribution of size, orientation and location of attracting and repelling structures. Hyperbolic behaviour appeared in the fluid at and around points of intersection between the attracting and repelling Lagrangian coherent structures. The network of curves identifying distinct regions of coherent flow patterns is displayed in observed relationship between the arrangement of Lagrangian coherent structures and various Eulerian fields.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据