Simulations of dense granular flow: Dynamic arches and spin organization

S. Luding*, J. Duran, E. Clément, J. Rajchenbach

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    18 Citations (Scopus)

    Abstract

    We present a numerical model for a two dimensional (2D) granular assembly, falling in a rectangular container when the bottom is removed. We observe the occurrence of cracks splitting the initial pile into pieces, like in experiments. We study in detail various mechanisms connected to the "discontinuous decompaction" of this granular material. In particular, we focus on the history of one single long range crack, from its origin at one side wall, until it breaks the assembly into two pieces. This event is correlated to an increase in the number of collisions, i.e. strong pressure, and to a momentum wave originated by one particle. Eventually, strong friction reduces the falling velocity such that the crack may open below the slow, high pressure "dynamic arch". Furthermore, we report the presence of large, organized structures of the particles' angular velocities in the dense parts of the granulate when the number of collisions is large.

    Original languageEnglish
    Pages (from-to)823-836
    Number of pages14
    JournalJournal de Physique I
    Volume6
    Issue number6
    DOIs
    Publication statusPublished - 1 Jan 1996

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