Spontaneous formation of density waves in granular matter under swirling excitation

Zhao SC, Pöschel T (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Physics of Fluids American Institute of Physics (AIP)

Book Volume: 33

Article Number: 081701

Journal Issue: 8

DOI: 10.1063/5.0056143

Abstract

We study here the spontaneous clustering of a submonolayer of grains under horizontal circular shaking. The clustering of grains occurs when increasing the oscillation amplitude beyond a threshold. The dense area travels in a circular fashion at the driving frequency, which even exceeds the speed of driving. It turns out that the observed clustering is due to the formation of density waves. The analysis of a phenomenological model shows that the instability of the uniform density profile arises by increasing the oscillation amplitude and captures the non-monotonic dependence of the transition amplitude of the clustering on the global density of the system. Here, the key ingredient is that the velocity of individual grains increases with the local density. The interplay of the dissipative particle-particle interaction and frictional driving of the substrate results in this dependence, which is tested with discrete element method simulations.

Authors with CRIS profile

Thorsten Pöschel Lehrstuhl für Multiscale Simulation of Particulate Systems (MSS)

Involved external institutions

Xi’an Jiaotong-Liverpool University (XJTLU) CN China (CN)

How to cite

APA:

Zhao, S.C., & Pöschel, T. (2021). Spontaneous formation of density waves in granular matter under swirling excitation. Physics of Fluids, 33(8). https://doi.org/10.1063/5.0056143

MLA:

Zhao, Song Chuan, and Thorsten Pöschel. "Spontaneous formation of density waves in granular matter under swirling excitation." Physics of Fluids 33.8 (2021).

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