On dense granular flows.
Reads0
Chats0
TLDR
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
More filters
Journal ArticleDOI
Influence of snow cover properties on avalanche dynamics
TL;DR: In this article, the authors investigated the relationship between snow cover properties and the internal granular composition, which in turn affects the flow dynamics of an avalanche and demonstrated that temperature has a major impact on the formation of granules, and that the warmest temperatures are located in the deposits of the dense core.
Journal ArticleDOI
A two-phase two-layer model for fluidized granular flows with dilatancy effects
TL;DR: In this article, a two-phase two-thin-layer model for fluidized debris flows is proposed, based on the closure relation proposed by Roux and Radjai (1998).
Journal ArticleDOI
Investigation of sheet-flow processes based on novel acoustic high-resolution velocity and concentration measurements
TL;DR: In this article, an acoustic concentration and velocity profiler is used to measure time-resolved profiles of collocated 2C velocity and sediment concentration and to measure the time evolution of the bed interface position.
Journal ArticleDOI
Depth Averaged Models for Fast Landslide Propagation: Mathematical, Rheological and Numerical Aspects
M. Pastor,T. Blanc,B. Haddad,V. Drempetic,Mila Sanchez Morles,Paola Dutto,Miguel Martín Stickle,P. Mira,J. A. Fernández Merodo +8 more
TL;DR: In this article, the authors present an overview of depth averaged modeling of fast catastrophic landslides where coupling of solid skeleton and pore fluid (air and water) is important, and propose an improvement based on combining Finite Difference meshes associated to SPH nodes to describe pore pressure evolution inside the landslide mass.
Journal ArticleDOI
On the rheology of dilative granular media: Bridging solid- and fluid-like behavior
TL;DR: In this paper, a rate-dependent plasticity model for dilative granular media is presented, aiming to bridge the seemingly disparate solid-and fluid-like behavioral regimes, where the material strength is composed of a dilation part and a ratedependent residual strength.
References
More filters
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.