On the alignment dynamics of a passive scalar gradient in a two-dimensional flow -: art. no. 117102

被引：12
|
作者：
Garcia, A [1 ]
Gonzalez, M [1 ]
Paranthoën, P [1 ]
机构：
[1] CNRS, UMR 6614, CORIA, Lab Thermodynam, F-76801 St Etienne, France
来源：
PHYSICS OF FLUIDS | 2005年 / 17卷 / 11期
关键词：
D O I：
10.1063/1.2130750
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
A Lagrangian study of the statistical properties of the orientation of a passive scalar gradient is performed using experimental data and a simple, numerical analysis. It is shown that, in a low-Reynolds number Benard-von Karman street, the temperature gradient downstream of a heated line source does not align with the asymptotic orientation predicted by the Lapeyre model [Phys. Fluids 11, 3729 (1999)] in the hyperbolic regions. This result is ascribed to fluctuations of strain persistence along Lagrangian trajectories. A numerical analysis of the scalar gradient alignment properties shows that these fluctuations, together with a low level of the rate of strain, may lead to preferential orientations that are different from the theoretical one predicted by an asymptotic model. (c) 2005 American Institute of Physics.
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页码：1 / 8
页数：8
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