Anomalous diffusion in confined turbulent convection

被引：10

作者：

Boffetta, G. ^{[1
,2
]}

De Lillo, F. ^{[1
,2
]}

Musacchio, S. ^{[3
]}

机构：

[1] Univ Turin, Dipartimento Fis, I-10125 Turin, Italy

[2] Univ Turin, Ist Nazl Fis Nucl, I-10125 Turin, Italy

[3] Univ Nice Sophia Antipolis, CNRS, UMR 7351, Lab JA Dieudonne, F-06108 Nice, France

来源：

PHYSICAL REVIEW E | 2012年 / 85卷 / 06期

关键词：

RAYLEIGH-TAYLOR INSTABILITY;

D O I：

10.1103/PhysRevE.85.066322

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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.

引用

页数：5

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