PASSIVE SCALAR FLUCTUATIONS WITH AND WITHOUT A MEAN GRADIENT - A NUMERICAL STUDY

被引：22

作者：

CHING, ESC

TU, YH

机构：

[1] UNIV CALIF SANTA BARBARA, INST THEORET PHYS, SANTA BARBARA, CA 93106 USA

[2] CALTECH, PASADENA, CA 91125 USA

来源：

PHYSICAL REVIEW E | 1994年 / 49卷 / 02期

关键词：

D O I：

10.1103/PhysRevE.49.1278

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 report a numerical study of a passive scalar advected by a random incompressible Gaussian velocity field. The calculations are carried out on a two-dimensional square lattice. Depending on the two dimensionless parameters in the problem, the scalar fluctuations at the center can be Gaussian, exponential, or stretched exponential. This is true not only when the passive scalar is subjected to a uniform mean gradient but also true when a new alternating boundary condition is used which results in a mean scalar profile that has a vanishing gradient in the central region.

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页码：1278 / 1282

页数：5

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