Dispersion in the large-deviation regime. Part 1: shear flows and periodic flows

Dispersion in the large-deviation regime. Part 1: shear flows and periodic flows
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大偏差区域的分散。

DOI:
10.1017/jfm.2014.64
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发表时间:
2014
影响因子:
3.7
通讯作者:
Haynes P
Haynes P
中科院分区:
工程技术2区
文献类型:
--
作者:
Haynes P

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被动标量在流体中通过平流和分子扩散的共同作用而弥散,通常被描述为扩散过程,其有效扩散系数比分子扩散值更大。然而,这种描述未能捕捉到初值问题中标量浓度分布的尾部。为了纠正这个问题,我们发展了一个标量弥散的大偏差理论,该理论提供了一个在远离质心的更大距离上有效的标量浓度的近似,特别是作为细胞流动的渐近处理的距离。)将大偏差理论的预测与蒙特卡罗模拟进行了比较,后者使用重要性抽样精确地估计了浓度的尾部。
The dispersion of a passive scalar in a fluid through the combined action of advection and molecular diffusion is often described as a diffusive process, with an effective diffusivity that is enhanced compared with the molecular value. However, this description fails to capture the tails of the scalar concentration distribution in initial-value problems. To remedy this, we develop a large-deviation theory of scalar dispersion that provides an approximation to the scalar concentration valid at much larger distances away from the centre of mass, specifically distances that are asymptotic treatment of cellular flows.) The predictions of large-deviation theory are compared with Monte Carlo simulations that estimate the tails of concentration accurately using importance sampling.
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