Friction dependence of shallow granular flows from discrete particle simulations

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    Abstract

    A shallow-layer model for granular flows is completed with a closure relation for the macroscopic bed friction or basal roughness obtained from micro-scale discrete particle simulations of steady flows. We systematically vary the bed friction by changing the contact friction coefficient between basal and flowing particles, while the base remains geometrically rough. By simulating steady uniform flow over a wide parameter range, we obtain a friction law that is a function of both flow and bed variables. Surprisingly, we find that the macroscopic bed friction is only weakly dependent on the contact friction of bed particles and predominantly determined by the properties of the flowing particles.
    Original languageUndefined
    Place of PublicationEnschede
    PublisherUniversity of Twente, Department of Applied Mathematics
    Number of pages6
    Publication statusPublished - Oct 2011

    Publication series

    Name
    PublisherUniversity of Twente, Department of Applied Mathematics
    No.1958
    ISSN (Print)1874-4850
    ISSN (Electronic)1874-4850

    Keywords

    • EWI-20679
    • METIS-279716
    • IR-78270
    • Avalanches
    • Complex fluids and colloidal systems
    • Granular solids
    • Granular systems
    • Granular flow
    • Rheology

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