Crossover between Anomalous Superdiffusion and Normal Diffusion in Oscillating Convection Flows

Abstract

Anomalous diffusion found in fluid systems is studied. Diffusion constants and mean square displacements are analytically obtained on the basis of the continuous-time random walk (CTRW) velocity model, and the values are compared with those obtained from model simulations employing dissipative dynamics describing oscillating convection flows. Good agreement is obtained.