Superdiffusion of massive particles induced by multi-scale velocity fields
CFTC, Universidade de Lisboa - Av. Prof. Gama Pinto 2, 1649-003 Lisbon, Portugal, EU
2 Computational Physics, IfB, HIF E12, ETH Hönggerberg - CH-8093 Zürich, Switzerland
3 Departamento de Física, Universidade Federal do Ceará - 60451-970 Fortaleza, Ceará, Brazil
Accepted: 14 July 2010
We study drag-induced diffusion of massive particles in scale-free velocity fields, where superdiffusive behavior emerges due to the scale-free size distribution of the vortices of the underlying velocity field. The results show qualitative resemblance to what is observed in fluid systems, namely the diffusive exponent for the mean square separation of pairs of particles and the preferential concentration of the particles, both as a function of the response time.
PACS: 82.56.Lz – Diffusion / 05.20.Jj – Statistical mechanics of classical fluids / 81.05.Rm – Porous materials; granular materials
© EPLA, 2010