Dimensional transition of energy cascades in stably stratified forced thin fluid layers
Dimensional transition of energy cascades in stably stratified forced thin fluid layers
复制标题
稳定分层强制薄流体层中能量级联的维度转变
DOI：
10.1063/1.4915074
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发表时间：
2014
影响因子：
4.6
通讯作者：
S. Musacchio
中科院分区：
文献类型：
--
作者：
A. Sozza;G. Boffetta;Paolo Muratore;S. Musacchio
我们研究稳定的密度分层对中等尺度下薄流体层的湍流动力学的影响。通过在 Boussinesq 近似中进行的一组高分辨率数值模拟，我们研究了分层和限制如何影响动能和势能转移的机制。对能量耗散率、能量交换率以及势能和动能谱通量统计的详细分析表明，分层为能量向小尺度传递提供了新的通道，从而减少了大尺度动能通量。我们还讨论了涡旋拉伸和熵通量在小尺度动能转化为势能中的作用。
We study the effects of a stable density stratification on the turbulent dynamics of thin fluid layers forced at intermediate scales. By means of a set of high-resolution numerical simulations, performed within the Boussinesq approximation, we investigate how the stratification and confinement affect the mechanisms of kinetic and potential energy transfer. The detailed analysis of the statistics of the energy-dissipation rates and energy-exchange rates and of the spectral fluxes of potential and kinetic energy shows that stratification provides a new channel for the energy transfer towards small scales which reduces the large-scale flux of kinetic energy. We also discuss the role of vortex stretching and enstrophy flux in the transfer of kinetic energy into potential energy at small scales.