Long relaxation times and tilt sensitivity in Rayleigh Benard turbulence

被引：73

作者：

Chillà, F ^{[1
]}

Rastello, M ^{[1
]}

Chaumat, S ^{[1
]}

Castaing, B ^{[1
]}

机构：

[1] Ecole Normale Super Lyon, Phys Lab, UMR5672, F-69364 Lyon 7, France

来源：

EUROPEAN PHYSICAL JOURNAL B | 2004年 / 40卷 / 02期

关键词：

D O I：

10.1140/epjb/e2004-00261-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We study the influence of a small tilt angle (0 < theta < 3 x 10(-2) rd) on the Nusselt number in a 1/2 aspect ratio Rayleigh-Benard cell, at high Rayleigh number (5 x 10(11) < Ra < 4 x 10(12)). The small decrease observed is interpreted as revealing a two rolls structure of the flow. Transitions between different global flows are also observed. on very long times, comparable to the diffusion time on the whole cell. The consequence is that the Nusselt number observed in most high Ra experiments should significantly depend on initial conditions.

引用

页码：223 / 227

页数：5

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