Coarse-grained strain dynamics and backwards/forwards dispersion

Details Coarse-grained strain dynamics and backwards/forwards dispersion Coarse-grained strain dynamics and backwards/forwards dispersion

2006-10-19

arxiv.org/abs/physics/0610150v1

Physics

Fluid Dynamics

13 pages, 7 figues

Scientific paper

A Particle Tracking Velocimetry experiment has been performed in a turbulent flow at intermediate Reynolds number. We present experimentally obtained stretching rates for particle pairs in the inertial range. When compensated by a characteristic time scale for coarse-grained strain we observe constant stretching. This indicates that the process of material line stretching taking place in the viscous subrange has its counterpart in the inertial subrange. We investigate both forwards and backwards dispersion. We find a faster backwards stretching and relate it to the problem of relative dispersion and its time asymmetry.

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