A new Eulerian-Lagrangian length-scale in turbulent flows

被引：12
|
作者：
Khan, MAI
Vassilicos, JC
机构：
[1] Univ Cambridge, DAMTP, Cambridge CB3 9EW, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Aeronaut, London SW7 2BY, England
来源：
PHYSICS OF FLUIDS | 2004年 / 16卷 / 01期
关键词：
D O I：
10.1063/1.1630325
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
We introduce a time-dependent Eulerian-Lagrangian length-scale and an inverse locality hypothesis which explain scalings of second order one-particle Lagrangian structure functions observed in kinematic simulations (KS) of homogeneous isotropic turbulence. Our KS results are consistent with the physical picture that particle trajectories are more/less autocorrelated if they are smoother/rougher as a result of encountering less/more straining stagnation points, thus leading to enhanced/reduced turbulent diffusion. (C) 2004 American Institute of Physics.
引用
收藏
页码：216 / 218
页数：3
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