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Lagrangian turbulence
G. Boffetta
University of Torino, Italy
boffetta@to.infn.it(Abstract received 01/12/2005 for session B)
ABSTRACT
Lagrangian acceleration in turbulence is one of the most intermittent phenomenon in nature. At the typical Reynolds number of laboratory experiments, the instantaneous acceleration can easily attain values 80 times the root mean square value. In this talk I will review the problem of turbulent Lagrangian statistics on the basis of a set of high resolution direct numerical simulations. High resolution Lagrangian statistics is obtained in a range of time spanning more than three decades, from less than a tenth of the Kolmogorov timescale up to one large-eddy turnover time. Acceleration intermittency is found to originate from the trapping of Lagrangian tracers in strong vortices at the Kolmogorov scale.
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2005 LAPCOD Meeting, Lerici, Italy, June 13-17, 2005