Angular statistics of Lagrangian trajectories in turbulence
The angle between subsequent particle displacement increments is evaluated as a function of the time lag in isotropic turbulence. It is shown that the evolution of this angle contains two well-defined power laws, reflecting the multiscale dynamics of high-Reynolds number turbulence. The probability...
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| Published in | Physical review letters Vol. 114; no. 21; p. 214502 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
29.05.2015
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| Online Access | Get more information |
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| Summary: | The angle between subsequent particle displacement increments is evaluated as a function of the time lag in isotropic turbulence. It is shown that the evolution of this angle contains two well-defined power laws, reflecting the multiscale dynamics of high-Reynolds number turbulence. The probability density function of the directional change is shown to be self-similar and well approximated by an analytically derived model assuming Gaussianity and independence of the velocity and the Lagrangian acceleration. |
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| ISSN: | 1079-7114 |
| DOI: | 10.1103/physrevlett.114.214502 |