Download video Transcript View all New J. Phys. video abstracts In this paper, we describe the recent developments in the field of buoyancy-driven turbulence with a focus on energy spectrum and flux. Scaling and numerical arguments show that the stably-stratified turbulence with moderate stratification has kinetic energy spectrum and the kinetic energy flux , which is called Bolgiano-Obukhov scaling. However, for Prandtl number near unity, the energy flux for the three-dimensional Rayleigh–Bénard convection (RBC) is approximately constant in the inertial range that results in Kolmorogorv's spectrum () for the kinetic energy. The phenomenology of RBC should apply to other flows where the buoyancy feeds the kinetic energy, e.g. bubbly turbulence and fully-developed Rayleigh Taylor instability. This paper also covers several models that predict the Reynolds and Nusselt numbers of RBC. Recent works show that the viscous dissipation rate of RBC scales as , where is the Rayleigh number.
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机译：下载视频抄本查看全部New J. Phys。视频摘要在本文中，我们以能量谱和通量为重点，介绍了浮力驱动湍流领域的最新发展。标度和数值论证表明，具有中等分层的稳定分层湍流具有动能谱和动能通量，称为Bolgiano-Obukhov标度。但是，对于普朗特数接近于1的情况，三维Rayleigh-Bénard对流（RBC）的能量通量在惯性范围内近似恒定，这导致了Kolmorogorv的动能谱（）。 RBC的现象学应适用于浮力提供动能的其他流量，例如气泡状湍流和充分发展的瑞利泰勒不稳定性。本文还涵盖了几种预测RBC的雷诺数和Nusselt数的模型。最近的工作表明，RBC的粘性耗散率定为，其中瑞利数为。
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