Intermittency and coherent structures in two-dimensional turbulence
Intermittency and coherent structures in two-dimensional turbulence
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二维湍流中的间歇性和相干结构
DOI：
10.1088/0305-4470/19/18/023
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
A. Vulpiani
中科院分区：
文献类型：
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作者：
R. Benzi;G. Paladin;S. Patarnello;P. Santangelo;A. Vulpiani
本文研究了二维湍流中涡度拟能传递的机制。通过对极小尺度下碎裂过程的理论讨论，指出由于流场在任何时刻都是规则的，所以涡度拟能的传递必然是空间填充的。数值衰减实验的详细分析证实了这一点。然而，由于相干结构的存在，即涡旋，抑制局部拟能转移，“不稳定性”在大尺度上起作用。
The authors study the mechanisms of enstrophy transfer in 2D turbulence. By theoretical discussion of the fragmentation process at very small scales, the authors show that enstrophy transfer must be space filling, due to the regularity of the flow at any time. Detailed analysis of a numerical decaying experiment confirms this picture. Yet 'intermittency' is acting at large scale due to the presence of coherent structures, namely vortices, which inhibit local enstrophy transfer.