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Anomalous diffusion in confined turbulent convection.

作者信息

Boffetta G, De Lillo F, Musacchio S

机构信息

Dipartimento di Fisica and INFN, Università di Torino, via Pietro Giuria 1, 10125 Torino, Italy.

出版信息

Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Jun;85(6 Pt 2):066322. doi: 10.1103/PhysRevE.85.066322. Epub 2012 Jun 27.

DOI:10.1103/PhysRevE.85.066322
PMID:23005221
Abstract

Turbulent convection in quasi-one-dimensional geometry is studied by means of high-resolution direct numerical simulations within the framework of Rayleigh-Taylor turbulence. Geometrical confinement has dramatic effects on the dynamics of the turbulent flow, inducing a transition from superdiffusive to subdiffusive evolution of the mixing layer and arresting the growth of kinetic energy. A nonlinear diffusion model is shown to reproduce accurately the above phenomenology. The model is used to predict, without free parameters, the spatiotemporal evolution of the heat flux profile and the dependence of the Nusselt number on the Rayleigh number.

摘要

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