Mixing the Earth's mantle by thermal convection: A scale dependent phenomenon
Mixing the Earth's mantle by thermal convection: A scale dependent phenomenon
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通过热对流混合地幔：一种与尺度相关的现象
DOI：
10.1029/94gl00049
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
U. Hansen
中科院分区：
文献类型：
--
作者：
J. Schmalzl;U. Hansen
本文研究了无限普朗特数流动中二维Rayleigh Benard对流的混合特性。通过将示踪粒子注入到先前计算的流场中来监测混合特性。用粒子关联函数H（r）和关联维数来表征混合效率与其强度和结构的关系。我们证明所选择的方法可以详细地捕捉混合过程。我们的研究表明，流动的混合特性取决于空间尺度。在瑞利数106 < Ra < 108时，一个循环单元内的不均匀性被迅速破坏，而两个相邻的单元可以保持基本上更长时间的不混合。
We have investigated the mixing properties of 2D Rayleigh Benard convection in infinite Prandtl number flows. The mixing properties were monitored by injecting tracer particles into previously calculated flow fields. A particle correlation function H(r) and the corresponding correlation dimension have been used to characterize the mixing efficiency of the flow as function of its vigor and it's structure. We demonstrate that the chosen method captures the mixing process in a detailed manner. Our study suggests that mixing properties of the flow depend on the spatial scale. At Rayleighnumbers 106 < Ra < 108 heterogeneities within one circulation cell are destroyed rapidly while two adjacent cells can remain unmixed substantially longer.