Nonlinear Diffusion Model for Rayleigh-Taylor Mixing

被引：27
|
作者：
Boffetta, G. [1 ,2 ]
De Lillo, F. [1 ]
Musacchio, S. [3 ]
机构：
[1] Univ Torino, Dipartimento Fis Gen & INFN, I-10125 Turin, Italy
[2] CNR ISAC, Sez Torino, I-10133 Turin, Italy
[3] CNRS, Lab JA Dieudonne, UMR 6621, F-06108 Nice, France
来源：
PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 03期
关键词：
3-DIMENSIONAL NUMERICAL SIMULATIONS; THERMAL-CONVECTION; IA-SUPERNOVAE; INSTABILITY; TURBULENCE; NUMBER;
D O I：
10.1103/PhysRevLett.104.034505
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The complex evolution of turbulent mixing in Rayleigh-Taylor convection is studied in terms of eddy diffusivity models for the mean temperature profile. It is found that a nonlinear model, derived within the general framework of Prandtl mixing theory, reproduces accurately the evolution of turbulent profiles obtained from numerical simulations. Our model allows us to give very precise predictions for the turbulent heat flux and for the Nusselt number in the ultimate state regime of thermal convection.
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页数：4
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