Effect of Weak Rotation on Large-Scale Circulation Cessations in Turbulent Convection

被引：6

作者：

Assaf, Michael ^{[1
]}

Angheluta, Luiza ^{[1
,2
]}

Goldenfeld, Nigel ^{[1
]}

机构：

[1] Univ Illinois, Dept Phys, Loomis Lab Phys, Urbana, IL 61801 USA

[2] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 07期

基金：

美国国家科学基金会;

关键词：

RAYLEIGH-BENARD CONVECTION; HEAT-TRANSPORT; NUMBER;

D O I：

10.1103/PhysRevLett.109.074502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the effect of weak rotation on the large-scale circulation (LSC) of turbulent Rayleigh-Benard convection, using the theory for cessations in a low-dimensional stochastic model of the flow previously studied. We determine the cessation frequency of the LSC as a function of rotation, and calculate the statistics of the amplitude and azimuthal velocity fluctuations of the LSC as a function of the rotation rate for different Rayleigh numbers. Furthermore, we show that the tails of the reorientation PDF remain unchanged for rotating systems, while the distribution of the LSC amplitude and correspondingly the cessation frequency are strongly affected by rotation. Our results are in close agreement with experimental observations.

引用

页数：5

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