Effects of Prandtl number in two-dimensional turbulent convection

被引：1

作者：

何建超 ^{[1
]}

方明卫 ^{[1
]}

高振源 ^{[2
,3
]}

黄仕迪 ^{[2
,3
]}

包芸 ^{[1
]}

机构：

[1] School of Aeronautics and Astronautics,Sun Yat-sen University

[2] Center for Complex Flows and Soft Matter Research and Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology

[3] Guangdong Provincial Key Laboratory of Turbulence Research and Applications,Southern University of Science and Technology

来源：

Chinese Physics B | 2021年 / 30卷 / 09期

基金：

中央高校基本科研业务费专项资金资助; 中国国家自然科学基金;

关键词：

D O I：

暂无

中图分类号：

O357.5 [湍流（紊流）];

学科分类号：

080103 ; 080704 ;

摘要：

We report a numerical study of the Prandtl-number(Pr) effects in two-dimensional turbulent Rayleigh-Benard convection.The simulations were conducted in a square box over the Pr range from 0.25 to 100 and over the Rayleigh number(Ra) range from 107 to 1010.We find that both the strength and the stability of the large-scale flow decrease with the increasing of Pr,and the flow pattern becomes plume-dominated at high Pr.The evolution in flow pattern is quantified by the Reynolds number(Re),with the Ra and the Pr scaling exponents varying from 0.54 to 0.67 and-0.87 to-0.93,respectively.It is further found that the non-dimensional heat flux at small Ra diverges strongly for different Pr,but their difference becomes marginal as Ra increases.For the thermal boundary layer,the spatially averaged thicknesses for all the Pr numbers can be described by δ～Raapproximately,but the local values vary a lot for different Pr,which become more uniform with Pr increasing.

引用

页码：220 / 226

页数：7

共 50 条

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