Drude approach to anomalous diffusion: Application to Richardson dispersion in turbulent flows

We investigate two-particle dispersion in fully developed turbulence within a Lévy-walk stochastic model using a generalized Drude approach. Different from one-particle pictures we focus here on the time evolution of the relative distance between two particles. Based on the Kolmogorov-Obukhov energy spectrum and on the temporal correlations in the flow the Richardson t 3 -law follows as a Lévy-type enhancement of rare events.