Granular wave-solid state: an accident of density inversion?

IF 2.3 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Granular Matter Pub Date : 2022-09-10 DOI:10.1007/s10035-022-01266-y

Kai Zhang, Farong Kou, Fugui Sun, Huajia Zhong, Meng Chen

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引用次数: 3

Abstract

Discrete element simulations are carried out to investigate the dissipation behavior of granular balls in a quasi-2D closed granular container subjected to vertical vibration. In the Density Inversion (DI) region of granular phase diagram, an unknown granular motion pattern that has never been reported before occurs scatteredly, where a dense hexagonal close-packed granular cluster is supported by arch-like undulating granular layers underneath. We call this phenomenon the granular Wave-solid State (WS). The occasionality of WS occurring in the DI region is further revealed by re-simulating 100 times on the original seven groups of excitation parameters. Similarities and differences in the dissipation behavior between WS and DI obtained by the same excitation parameters are analyzed by comparing the motion pattern of granular bed, the packing structure of dense granular cluster and the density profile, velocity profile and loss profile of vibrated granular balls. Moreover, the initial packing structures of WS and DI obtained by the same excitation parameters are compared, which indicates that the dissipation behavior of vibrated granular balls is related to their initial packing structure.

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粒状波-固态:密度反演的偶然事件?

采用离散元模拟方法研究了准二维密闭颗粒容器中颗粒球在垂直振动作用下的耗散行为。在颗粒相图的密度反演(DI)区域，分散地出现了一种未知的颗粒运动模式，其中密集的六边形紧密排列的颗粒簇由其下的拱形起伏颗粒层支撑。我们称这种现象为颗粒状波固态(WS)。对原7组激励参数进行100次再模拟，进一步揭示了WS在DI区发生的偶然性。通过比较颗粒床的运动模式、致密颗粒团簇的堆积结构以及振动颗粒球的密度分布、速度分布和损失分布，分析了相同激励参数下WS和DI耗散行为的异同。并对相同激励参数下得到的WS和DI的初始填充结构进行了比较，表明振动颗粒球的耗散行为与其初始填充结构有关。

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来源期刊

Granular Matter Materials Science-General Materials Science

CiteScore

4.60

自引率

8.30%

发文量

审稿时长

6 months

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.