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Deformation of Tetrahedra in Turbulence

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The evolution of multi-particle structures provides insight into turbulent mixing and turbulence dynamics. In this talk, we discuss experimental and numerical findings of the deformation of tetrahedra in turbulence, both forward and backward in time. For short times, our theoretical analysis gives a result in close agreement with experimental and numerical data, and shows quantitatively the mechanism that breaks the symmetry in time. We also extend our analysis to turbulent flows with dilute polymer additives.

Author(s):

Jennifer Mutschall    
Max Planck Institute for Dynamics and Self-Organization (MPIDS)
Germany

Haitao Xu    
Max Planck Institute for Dynamics and Self-Organization (MPIDS)
Germany

Alain Pumir    
Laboratoire de Physique, Ecole Normale Supéprieure de Lyon
France

Eberhard Bodenschatz    
Max Planck Institute for Dynamics and Self-Organization (MPIDS)
Germany