Joint statistics of acceleration and vorticity in fully developed turbulence

L. Biferale, F. Toschi

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18 Citations (Scopus)

Abstract

We report results from a high-resolution numerical study of fluid particles transported by a fully developed turbulent flow at R¿ = 280. Single-particle trajectories were followed for a time range spanning more than three decades, from less than a tenth of the Kolmogorov timescale up to one large-eddy turnover time. We present results concerning acceleration statistics and the statistics of trapping by vortex filaments conditioned to the local values of vorticity and enstrophy. We found that a suitable observable, a¿ = a v, connected to the centripetal acceleration, is strongly sensitive to the trapping of particles into vortex filaments. In particular, we found that its sign may persist up to 10-15 t¿, while the typical oscillation of the longitudinal acceleration happens on a time lag of a few t¿.
Original languageEnglish
Pages (from-to)1-8
JournalJournal of Turbulence
Volume6
Issue number40
DOIs
Publication statusPublished - 2005

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