Universal intermittent properties of particle trajectories in highly turbulent flows

Details Universal intermittent properties of particle trajectories in highly turbulent flows Universal intermittent properties of particle trajectories in highly turbulent flows

2008-02-26

arxiv.org/abs/0802.3776v2

Phys. Rev. Lett. 100, 254504 (2008)

Nonlinear Sciences

Chaotic Dynamics

5 pages, 1 figure; content changed, references updated

Scientific paper

10.1103/PhysRevLett.100.254504

We present a collection of eight data sets, from state-of-the-art experiments and numerical simulations on turbulent velocity statistics along particle trajectories obtained in different flows with Reynolds numbers in the range $R_\lambda \in [120:740]$. Lagrangian structure functions from all data sets are found to collapse onto each other on a wide range of time lags, revealing a universal statistics, and calling for a unified theoretical description. Parisi-Frisch Multifractal theory, suitable extended to the dissipative scales and to the Lagrangian domain, is found to capture intermittency of velocity statistics over the whole three decades of temporal scales here investigated.

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