Exponential decay of chaotically advected passive scalars in the zero diffusivity limit.
Exponential decay of chaotically advected passive scalars in the zero diffusivity limit.
复制标题
零扩散率极限下混沌平流被动标量的指数衰减。
DOI：
10.1103/physreve.71.066301
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
E. Ott
中科院分区：
文献类型：
--
作者：
Y. Tsang;T. Antonsen;E. Ott
研究了混沌流中被动标量方差的时间渐近衰减。两种机制，这种衰变，其中涉及的过程中，在短和长的长度尺度，分别被认为是。讨论了基于拉格朗日拉伸理论的短尺度机构的有效性。我们还调查了这两种机制的适用性和可观察到的签名制度。高分辨率的数值实验提供了支持证据。
The time asymptotic decay of the variance of a passive scalar in a chaotic flow is studied. Two mechanisms for this decay, which involve processes at short and long length scales, respectively, are considered. The validity of the short length scale mechanism, which is based on Lagrangian stretching theory, is discussed. We also investigate the regimes of applicability and observable signatures of the two mechanisms. Supporting evidence is provided by high resolution numerical experiments.