Time evolution of the eddy viscosity in two-dimensional Navier-Stokes flow

被引：7

作者：

Chaves, M ^{[1
]}

Gama, S ^{[1
]}

机构：

[1] Univ Porto, CMAUP, Dept Matemat Aplicada, P-4050 Porto, Portugal

来源：

PHYSICAL REVIEW E | 2000年 / 61卷 / 02期

关键词：

D O I：

10.1103/PhysRevE.61.2118

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：

The time evolution of the eddy viscosity associated with an unforced two-dimensional incompressible Navier-Stokes flow is analyzed by direct numerical simulation. The initial condition is such that the eddy viscosity is isotropic and negative. It is shown by concrete examples that the Navier-Stokes dynamics stabilizes negative eddy viscosity effects. in other words, this dynamics moves monotonically the initial negative eddy viscosity to positive values before relaxation due to viscous term occurs.

引用

页码：2118 / 2120

页数：3

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