Particle-based numerical modeling of a thin granular layer subjected to oscillating flow

摘要

Self-organization is observed in granular systems under permanent energy injection. Various aspects of this phenomena have been characterized in experimental studies, however, due to the partial access to the evolution of granular media, numerous details of this self organization process are unknown. Here, we investigate a simple, particle-based model that captures the dynamics of a quasi-two-dimensional shallow granular layer subjected to an air flow oscillating in time. Based on the numerical simulations, we characterize the phase diagram, structure and dynamics of domain walls, attractive standing waves, and reveal the origin of their wavelength. Our findings present a quite fair qualitative agreement with experimental observations.(c) 2021 Elsevier B.V. All rights reserved.