Coarse-grained strain dynamics and backwards/forwards dispersion
Fluid Dynamics
2007-05-23 v1
Abstract
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.
Cite
@article{arxiv.physics/0610150,
title = {Coarse-grained strain dynamics and backwards/forwards dispersion},
author = {J. Berg and B. Luthi and S. Ott and J. Mann},
journal= {arXiv preprint arXiv:physics/0610150},
year = {2007}
}
Comments
13 pages, 7 figues