On dense granular flows.
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A quantitative comparison between data coming from different experiments in the same geometry identifies the robust features in each case and a transverse analysis of the data across the different configurations allows to identify the relevant dimensionless parameters, the different flow regimes and to propose simple interpretations.Abstract:
The behaviour of dense assemblies of dry grains submitted to continuous shear deformation has been the subject of many experiments and discrete particle simulations. This paper is a collective work carried out among the French research group Groupement de Recherche Milieux Divises (GDR MiDi). It proceeds from the collection of results on steady uniform granular flows obtained by different groups in six different geometries both in experiments and numerical works. The goal is to achieve a coherent presentation of the relevant quantities to be measured i.e. flowing thresholds, kinematic profiles, effective friction, etc. First, a quantitative comparison between data coming from different experiments in the same geometry identifies the robust features in each case. Second, a transverse analysis of the data across the different configurations, allows us to identify the relevant dimensionless parameters, the different flow regimes and to propose simple interpretations. The present work, more than a simple juxtaposition of results, demonstrates the richness of granular flows and underlines the open problem of defining a single rheology.read more
Citations
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Journal ArticleDOI
Flow-Arrest Transitions in Frictional Granular Matter.
TL;DR: Observations indicate that granular arrest near critical shear stress is highly unpredictable and is strongly influenced by interparticle friction.
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Numerical investigation of the interplay between wall geometry and friction in granular fault gouge
TL;DR: In this paper, the effect of surface roughness and friction on the strength of a non-planar rough wall is investigated using the 3-D discrete element method (DEM).
Journal ArticleDOI
Rheology of a sonofluidized granular packing
TL;DR: In this paper, the rheology of a dry granular material under a weak level of vibration generated by sound injection was investigated and a simple heuristic model was proposed to account for the vanishing of the stress dynamical threshold at a finite vibration intensity and the onset of a linear force-velocity behavior.
Journal ArticleDOI
Stress diffusion in shear banding wormlike micelles
Marc-Antoine Fardin,Ovidiu Radulescu,Alexander Morozov,Olivier Cardoso,Julien Browaeys,Sandra Lerouge +5 more
TL;DR: In this paper, the authors show that the diffusive lengthscale is a strong function of the applied shear rate, decreasing rapidly across the stress plateau, and they argue that the strong dependence of the diffused lengthscale on the applied hear rate should be incorporated into the classical constitutive models to obtain quantitative predictions.
Journal ArticleDOI
Shear flow of dense granular materials near smooth walls. II. Block formation and suppression of slip by rolling friction.
TL;DR: The authors' simulations with rough walls are in agreement with previous results, provided the roughness is strong enough, however, in the limit of small roughness amplitude, the distinctive features of shearing with smooth walls are confirmed.
References
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Journal ArticleDOI
Dynamics of viscoplastic deformation in amorphous solids
Michael L. Falk,James S. Langer +1 more
TL;DR: In this article, a dynamical theory of low-temperature shear deformation in amorphous solids is proposed based on molecular-dynamics simulations of a two-dimensional, two-component non-crystalline system.
Journal ArticleDOI
Rapid granular flows
TL;DR: In this article, the authors present a review of the fluid-like behavior of granular solids and, in particular, those flows for which the material is rapidly sheared, and discuss various modeling techniques used to describe the motion of the bulk material.
Book
Statics and Kinematics of Granular Materials
TL;DR: In this article, Coulomb's method of wedges and differential slices were used to determine the stress and strain rate of Coulomb material, and the conical yield function was used to predict mass flow rate.
Journal ArticleDOI
Granular flow down an inclined plane: Bagnold scaling and rheology
Leonardo E. Silbert,Deniz Ertas,Gary S. Grest,Thomas C. Halsey,Dov Levine,Steven J. Plimpton +5 more
TL;DR: A systematic, large-scale simulation study of granular media in two and three dimensions, investigating the rheology of cohesionless granular particles in inclined plane geometries, finds that a steady-state flow regime exists in which the energy input from gravity balances that dissipated from friction and inelastic collisions is found.