COMPLEX EDDY-VISCOSITY - A 3-DIMENSIONAL EFFECT

被引：4
|
作者：
WIRTH, A
机构：
[1] CNRS, Observatoire de Nice, 06304 Nice Cedex 4
来源：
PHYSICA D | 1994年 / 76卷 / 1-3期
关键词：
D O I：
10.1016/0167-2789(94)90267-4
中图分类号：
O29 [应用数学];
学科分类号：
070104 ;
摘要：
It is shown that the response of spatially periodic three-dimensional flow to a weak large-scale momentum perturbation may involve a complex eddy-viscosity. This is in contrast to the eddy-diffusivity which is always positive and to the eddy-viscosity of two-dimensional flow which is real (but not necessarily positive). A simple ''two-and-a-half dimensional'' flow with a complex eddy-viscosity is (sin(x+y-z), 0, sin(x+y-z)+(1/root 3)sin x).
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页码：312 / 317
页数：6
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