Chaotic advection and targeted mixing
  The advection of passive tracers in an oscillating vortex chain is investigated. It is shown that by adding a suitable perturbation to the ideal flow, the induced chaotic advection exhibits two remarkable properties compared with a generic perturbation : Particles remain trapped within a specific domain bounded by two oscillating barriers (suppression of chaotic transport along the channel), and the stochastic sea seems to cover the whole domain (enhancement of mixing within the rolls). 
Tounsia Benzekri (CPT), Cristel Chandre (CPT), Xavier Leoncini (PIIM),   Ricardo Lima (CPT), Michel Vittot (CPT)