Particle Simulation of Cohesive Granular Materials

Matuttis, Hans‐Georg; Schinner, Alexander

doi:10.1142/s0129183101002723

Cited by 29 publications

(10 citation statements)

References 10 publications

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“…Cohesion also strongly increases the angle of avalanches, above which a static assembly of grains flows, and the angle of repose, below which the flow stops. This has been shown through rotating drum experiments using wet glass beads (Fraysse et al 1999;Tegzes et al 1999;Nase et al 2001;Bocquet et al 2002) as well as powders (Castellanos et al 1999(Castellanos et al , 2001Valverde et al 2000), through heap flow experiments (Mason et al 1999;Samandani & Kudrolli 2001), and through crater experiments and simulations using wet glass beads or powder (Hornbaker et al 1997;Tegzes et al 1999;Nase et al 2001;Mattutis & Schinner 2001). Castellanos et al (1999Castellanos et al ( , 2001 showed that dense flows cannot be achieved using too small grains such as fine powders (d 10 −4 m), since they are directly fluidized by the interstitial fluid from a solid to a suspension of fragile clusters.…”

Section: Effect Of Cohesive Force On Macroscopic Behaviormentioning

confidence: 98%

Dense flows of cohesive granular materials

Rognon

Roux

Naaïm³

et al. 2008

J. Fluid Mech.

151

150

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International audienceUsing molecular dynamic simulations, we investigate the characteristics of dense flows of model cohesive grains. We describe their rheological behavior and its origin at the scale of the grains and of their organization. Homogeneous plane shear flows give access to the constitutive law of cohesive grains which can be expressed by a simple friction law similar to the case of cohesionless grains, but intergranular cohesive forces strongly enhance the resistance to the shear. Then we show the consequence on flows down a slope: a plugged region develops at the free surface where the cohesion intensity is the strongest. Moreover, we measure various indicators of the microstructure within flows which evidence the aggregation of grains due to cohesion and we analyze the properties of the contact network (force distributions and anisotropy). This provides new insights into the interplay between the local contact law, the microstructure and the macroscopic behavior of cohesive grains

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Section: Effect Of Cohesive Force On Macroscopic Behaviormentioning

confidence: 98%

Dense flows of cohesive granular materials

Rognon

Roux

Naaïm³

et al. 2008

J. Fluid Mech.

151

150

View full text Add to dashboard Cite

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“…For many particles materials, the friction coefficient of the fluid-immersed particles would probably be lower. We neglect inter-particle cohesion, though it can be modeled quite easily in our DEM-approach [19]. These equations of motion for the particle simulation are solved using the second order backward difference formula (BDF2, Gear predictor-corrector of 2nd-order [20]).…”

Section: Discrete Element Methodsmentioning

confidence: 99%

Effect of the surrounding fluid on the compaction of granular materials by tapping: Slow dynamics made slower?

Matuttis

2013

AIP Conference Proceedings

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We investigate compaction due to tapping in two-dimensional granular columns computationally with the discrete element method (DEM) in two dimensions. We compare the compaction in dry granulates with the compaction of the system immersed in a viscous fluid. We use polygons as particle shapes, so that the resulting pore-space can be triangulated for a finite element method (FEM) for an incompressible fluid. We investigate the competition between a slowing-down of the dynamics due to the viscous forces of the fluid and the improved transmission of the tapping pulses through the fluid in the pore space. For the system immersed in water, the propagation of the shocks due to the tapping of the floor is faster than in the corresponding dry system. The center of mass of a nearly square system drops faster for the dry case than for immersed particles. For a system twice as high and half as wide, for the same vibration, for the dry system, the center of mass rises, while for the immersed particles there is hardly any change.

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“…If the size distribution is extended to smaller particles in the sub-millimeter range, cohesion effects come into play. Though we have the necessary algorithms available, 8,9) we abstained from using smaller particles to limit our investigation to systems with purely repulsive interactions. Initially, the particles are dropped into the system from above, then the lid is lowered.…”

Section: Simulationmentioning

confidence: 99%

Simulation of the Dependence of the Bulk-Stress–Strain Relations of Granular Materials on the Particle Shape

2006

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We investigate the effect of particle shape and interparticle friction on the stress-strain-relation using the discrete element method (DEM) in two dimensions. Elongated particles show a significantly higher shear strength than non-elongated particles. The relative maximum which is characteristic for experimental stress-strain curves of granular materials is found only for elongated particles with finite Coulomb friction, which indicates that the particle elongation is an important parameter in the statistical physics of granular materials. An earlier simulation result from another group which showed a maximum for non-elongated particles could be identified to be due to the formation of a shear band.

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Particle Simulation of Cohesive Granular Materials

Cited by 29 publications

References 10 publications

Dense flows of cohesive granular materials

Dense flows of cohesive granular materials

Effect of the surrounding fluid on the compaction of granular materials by tapping: Slow dynamics made slower?

Simulation of the Dependence of the Bulk-Stress–Strain Relations of Granular Materials on the Particle Shape

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