title: Turbulence and coarsening in active and passive binary mixtures.
abstract: Phase separation between two fluids in two dimensions is investigated by means of direct numerical simulations of coupled Navier-Stokes and Cahn-Hilliard equations. We study the phase ordering process in the presence of an external stirring acting on the velocity field. For both active and passive mixtures we find that, for a sufficiently strong stirring, coarsening is arrested in a stationary dynamical state characterized by a continuous rupture and formation of finite domains. Coarsening arrest is shown to be independent of the chaotic or regular nature of the flow.
authors.affiliation: Dipartimento di Fisica Generale and INFN Università di Torino, Via Pietro Giuria 1, I-10125 Torino, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Berti
authors.forename: G
authors.initials: G
authors.lastname: Boffetta
authors.forename: M
authors.initials: M
authors.lastname: Cencini
authors.forename: A
authors.initials: A
authors.lastname: Vulpiani