Intermittency of velocity time increments in turbulence

Details Intermittency of velocity time increments in turbulence Intermittency of velocity time increments in turbulence

2005-07-04

arxiv.org/abs/cond-mat/0507060v1

Physical Review Letters, 95, 064501 (2005).

Physics

Condensed Matter

Statistical Mechanics

5 pages, 3 figures, to appear in PRL

Scientific paper

10.1103/PhysRevLett.95.064501

We analyze the statistics of turbulent velocity fluctuations in the time domain. Three cases are computed numerically and compared: (i) the time traces of Lagrangian fluid particles in a (3D) turbulent flow (referred to as the "dynamic" case); (ii) the time evolution of tracers advected by a frozen turbulent field (the "static" case), and (iii) the evolution in time of the velocity recorded at a fixed location in an evolving Eulerian velocity field, as it would be measured by a local probe (referred to as the "virtual probe" case). We observe that the static case and the virtual probe cases share many properties with Eulerian velocity statistics. The dynamic (Lagrangian) case is clearly different; it bears the signature of the global dynamics of the flow.

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