Dinamica delle particelle pesanti in un flusso bidimensionale non omogeneo

Finite-size massive impurities suspended in turbulent flows, such as bubbles, droplets, dust particles, whose density is greater then the fluid carrying them, possess a dissipative dynamics which give rise to richer phenomena compared to those of passive tracers. Understanding such phenomena is of great importance in many scientific domain such as engineering, planetology, and cloud physics. Such heavy inertial particles (HIP) display a non-homogeneous distribution in space as a result of several effects: 1) because of Stokes drag, their dynamics is intrinsically dissipative which make HIP trajectories collapse into fractal attractors; 2) inhomogeneities in flow properties lead particles to move from regions of intense turbulence to regions of weaker turbulence (turbophoretic effect); 3) coherent vortices in flow eject particles as a consequence of centrifugal force. The object of this present work is to study the distribution in space and time of spherical HIP, smaller then the viscous scale of the fluid, embedded in a non-homogeneous flow with localised coherent vortices and investigate the correlation between flow properties and distribution structure.