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Detection of Lagrangian coherent structures in three-dimensional turbulence

Published online by Cambridge University Press:  23 January 2007

Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA


We use direct Lyapunov exponents (DLE) to identify Lagrangian coherent structures in two different three-dimensional flows, including a single isolated hairpin vortex, and a fully developed turbulent flow. These results are compared with commonly used Eulerian criteria for coherent vortices. We find that despite additional computational cost, the DLE method has several advantages over Eulerian methods, including greater detail and the ability to define structure boundaries without relying on a preselected threshold. As a further advantage, the DLE method requires no velocity derivatives, which are often too noisy to be useful in the study of a turbulent flow. We study the evolution of a single hairpin vortex into a packet of similar structures, and show that the birth of a secondary vortex corresponds to a loss of hyperbolicity of the Lagrangian coherent structures.

Copyright © Cambridge University Press 2007

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