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Identification of Lagrangian coherent structures in a turbulent boundary layer

Published online by Cambridge University Press:  11 July 2013

Z. D. Wilson ,
M. Tutkun  and
R. B. Cal
Z. D. Wilson
Affiliation:
Department of Mechanical and Materials Engineering, Portland State University, Portland, OR 97201, USA
M. Tutkun
Affiliation:
Department of Process and Fluid Flow Technology, Institute for Energy Technology, 2027 Kjeller, Norway Université Lille Nord de France, École Centrale de Lille, 59655 Villeneuve d’Ascq, France
R. B. Cal*
Affiliation:
Department of Mechanical and Materials Engineering, Portland State University, Portland, OR 97201, USA
*
†Email address for correspondence: cal@me.pdx.edu
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Abstract

Lagrangian coherent structures (LCS) of a turbulent boundary layer at ${\mathit{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.

JFM classification

Turbulent Flows: Turbulent Flows Turbulent Flows: Turbulent boundary layers
Type
Papers
Information
Journal of Fluid Mechanics , Volume 728 , 10 August 2013 , pp. 396 - 416
Copyright
©2013 Cambridge University Press 

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