Mean flow structure in horizontal convection
Mean flow structure in horizontal convection
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DOI：
10.1017/jfm.2016.866
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发表时间：
2017-01
影响因子：
3.7
通讯作者：
O. Shishkina
中科院分区：
文献类型：
--
作者：
O. Shishkina
我们分析了水平对流系统中的全球流动结构，其中热量的供应和移除通过流体层的较低水平表面的分离部分发生。结果是基于直接数值模拟的长度与高度的纵横比的对流细胞$\unicode[STIX]{x1 D 6 E4}=10$，瑞利数$\mathit{Ra}$从$3\times 10^{8}$到$3\times 10^{11}$和普朗特数$\mathit{Pr}$从0.05到50。水平对流中的平均流的结构被描述为温度、速度、动能、热耗散率和动能耗散率的时均空间分布。本文讨论了一种可能的大长宽比对流单体向湍流水平对流转变的情形。
We analyse the global flow structures in horizontal convection systems, where the heat supply and removal takes place through separated parts of a lower horizontal surface of a fluid layer. The results are based on direct numerical simulations for the length-to-height aspect ratio of the convection cell $\unicode[STIX]{x1D6E4}=10$ , Rayleigh number $\mathit{Ra}$ from $3\times 10^{8}$ to $3\times 10^{11}$ and Prandtl number $\mathit{Pr}$ from 0.05 to 50. The structure of the mean flows in horizontal convection is described in terms of time-averaged spatial distributions of the temperature, velocity, kinetic energy, thermal and kinetic dissipation rates. A possible scenario of transition to turbulent horizontal convection in the whole convection cell of a large aspect ratio is discussed.