Internal Structure of Inertial Granular Flows

Emilien Azéma 1 Farhang Radjai 1
1 PMMD - Physique et Mécanique des Milieux Divisés
LMGC - Laboratoire de Mécanique et Génie Civil
Abstract : We analyze inertial granular flows and show that, for all values of the inertial number I, the effective friction coefficient μ arises from three different parameters pertaining to the contact network and force transmission: 1) contact anisotropy, 2) force chain anisotropy and 3) friction mobilization. Our extensive 3D numerical simulations reveal that μ increases with I mainly due to an increasing contact anisotropy and partially by friction mobilization whereas the anisotropy of force chains declines as a result of the destabilizing effect of particle inertia. The contact network undergoes topological transitions, and beyond I ≃ 0.1 the force chains break into clusters immersed in a background "soup" of floating particles. We show that this transition coincides with the divergence of the size of fluidized zones characterized from the local environments of floating particles and a slower increase of μ with I.
Type de document :
Article dans une revue
Physical Review Letters, American Physical Society, 2014, 12, pp.078001
Contributeur : François Gibier <>
Soumis le : lundi 10 mars 2014 - 09:51:29
Dernière modification le : mercredi 11 février 2015 - 09:12:16
Document(s) archivé(s) le : mardi 10 juin 2014 - 10:52:02


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  • HAL Id : hal-00957291, version 1



Emilien Azéma, Farhang Radjai. Internal Structure of Inertial Granular Flows. Physical Review Letters, American Physical Society, 2014, 12, pp.078001. <hal-00957291>



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