Dipartimento di Fisica Generale and INFN, Università di Torino, via P. Giuria 1, 10125 Torino, Italy.
Phys Rev Lett. 2010 Jan 22;104(3):034505. doi: 10.1103/PhysRevLett.104.034505.
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.
瑞利-泰勒对流中湍动混合的复杂演化，根据平均温度分布的涡动扩散率模型来研究。结果发现，一个在普朗特混合理论的一般框架内推得的非线性模型，准确地再现了从数值模拟得到的湍动分布的演化。我们的模型使我们能够对热对流的最终状态下的湍动热流和努塞尔数，给出很精确的预测。
