Pattern formation of frictional fingers in a gravitational potential
Pattern formation of frictional fingers in a gravitational potential
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DOI：
10.1103/physrevfluids.3.013801
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发表时间：
2018-01-03
影响因子：
2.7
通讯作者：
Sandnes, Bjornar
中科院分区：
文献类型：
--
作者：
Eriksen, Jon Alm;Toussaint, Renaud;Sandnes, Bjornar
在倾斜的Hele-Shaw池中，液体-颗粒混合物在缓慢排水过程中出现具有特征宽度的对齐指状结构。随着倾斜角度和颗粒密度的变化，观察到从垂直到水平排列的指状结构的过渡。提出了一个分析模型，表明对齐属性的波动颗粒应力和静水压力之间的竞争的结果。在模拟中再现了动力学。我们还展示了该系统如何解释在自然界中观察到的模式，在堤防形成的早期阶段创建。
Aligned finger structures, with a characteristic width, emerge during the slow drainage of a liquid-granular mixture in a tilted Hele-Shaw cell. A transition from vertical to horizontal alignment of the finger structures is observed as the tilting angle and the granular density are varied. An analytical model is presented, demonstrating that the alignment properties are the result of the competition between fluctuating granular stresses and the hydrostatic pressure. The dynamics is reproduced in simulations. We also show how the system explains patterns observed in nature, created during the early stages of a dike formation.