European Turbulence Conference 2015

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10:45
15 mins

FINITE TIME LYAPUNOV EXPONENTS AND EXTREME CONCENTRATION FLUCTUATIONS IN 2D TURBULENCE
Hua Xia, Nicolas Francois, Horst Punzmann, Kamil Szewc, Michael Shats

Session: Lagrangian aspects of turbulence 4
Session starts: Friday 28 August, 10:30
Presentation starts: 10:45
Room: Room F

Hua Xia (The Australian National University)
Nicolas Francois (The Australian National University)
Horst Punzmann (The Australian national University)
Kamil Szewc (Polish Academy of Sciences)
Michael Shats (The Australian National University)

Abstract:
The Finite time Lyapunov exponent (FTLE) has been investigated in detail in laboratory 2D experiments. The balance of the forward and backward FTLE suggests the incompressible nature of the turbulence in both the electromagnetic and Faraday wave driven experiments. The tail in the PDF of the FTLE field has been shown to be correlated with the extreme concentration of the passive scale, the ‘unmixing’ event.