Fluid dynamics at the margin of rotational control
Fluid dynamics at the margin of rotational control
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DOI：
10.1007/s10652-008-9081-8
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发表时间：
2008-07
影响因子：
2.2
通讯作者：
J. McWilliams
中科院分区：
文献类型：
--
作者：
J. McWilliams
地球物理学家已经发展出一种关于地球自转的动力学影响的观点，而流体动力学的大多数其他领域可以安全地忽略自转。本文描述了旋转和非旋转流体力学领域的主要湍流和波动行为，并特别注意了它们的边界，其中旋转影响是显著的，但不是主要的。与地转湍流向大尺度的逆能量级联相反，在边界地带内，从诊断力平衡、锋生和锋面不稳定的破坏开始形成一个向微尺度耗散的正向能量级联，然后继续通过小尺度非旋转领域，直到在微尺度上耗散。
Geophysicists have developed a perspective on the dynamical influence of Earth’s rotation, while most other areas of fluid dynamics can safely disregard rotation. In this essay the dominant turbulence and wave behaviors in the rotating and non-rotating fluid-dynamical realms are described, and particular attention is given to their borderlands, where rotational influences are significant but not dominant. Contrary to the inverse energy cascade of geostrophic turbulence toward larger scales, a forward energy cascade toward microscale dissipation develops within the borderlands from the breakdown of diagnostic force balances, frontogenesis, and frontal instabilities, and then it continues further through the small-scale non-rotating realm until it dissipates at the microscale.