Finite-time statistics of scalar diffusion in Lagrangian coherent structures

被引：7
|
作者：
Tang, Wenbo [1 ]
Walker, Phillip [1 ]
机构：
[1] Arizona State Univ, Sch Math & Stat Sci, Tempe, AZ 85287 USA
来源：
PHYSICAL REVIEW E | 2012年 / 86卷 / 04期
基金：
美国国家科学基金会;
关键词：
PROBABILITY-DISTRIBUTION; TRANSPORT; DEFINITION; FLUID;
D O I：
10.1103/PhysRevE.86.045201
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
We study the variability of passive scalar diffusion via the statistics of stochastic particle dispersion in a chaotic flow. We find that at intermediate times when the statistics of individual trajectories start to exhibit scaling-law behaviors, scalar variance over the entire domain exhibits multimodal structure. We demarcate the domain based on Lagrangian coherent structures and find that the conditional statistics exhibit strong unimodal behavior, indicating coherence of effective diffusion among each Lagrangian partition of the flow.
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页数：5
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