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"Lagrangian Turbulence"

Relatore: Prof. Luca Biferale

Sala Feynman
01 Giugno 2005 ore 14.30

The statistical properties of velocity fields along the trajectories of fluid particles transported by a fully developed turbulent flow are investigated by means of high resolution Direct Numerical Simulations. We present results for single particle observables (Lagrangian velocity structure functions and particles' acceleration) for pair dispersion and for the geometry of clusters of four particles (tetrahedra). I will discuss in details the phenomenological interpretation of the Lagrangian intermittency of the velocity field and of the self-similar distribution of tetraedhra shapes.