Turbulence and coarsening in active and passive binary mixtures.
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.
Berti
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Dipartimento di Fisica Generale and INFN Università di Torino, Via Pietro Giuria 1, I-10125 Torino, Italy.
Boffetta
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Cencini
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Vulpiani
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