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Colecciones en esta comunidad
Material subido recientemente.
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Determination of the angle of repose and coefficient of rolling friction for wood pellets
(2022-02-08)The determination of the angle of repose for granular materials is indispensable for their handling and the design of containers and technological processing equipment. On the other hand, computational simulations have ... -
Effect of bevelled silo outlet in the flow rate during discharge
(2023-07-29)We investigate the effect of a bevelled (or slanted) outlet on the discharge rate of mono-sized spheres from a quasi-two-dimensional silo, using the discrete element method. In contrast to hopper discharges, where the ... -
Differential equation for the flow rate of discharging silos based on energy balance
(2020-05)Since the early work of Hagen in 1852 and Beverloo et al. in 1961, the flow rate of granular material discharging through a circular orifice from a silo has been described by means of dimensional analysis and experimental ... -
Stability and conductivity of proppant packs during flowback in unconventional reservoirs: a CFD–DEM simulation study
(Elsevier B.V., 2021)We present simulations using a coupled Computational Fluid Dynamics–Discrete Element Method (CFD–DEM) approach for a slurry of millimeter-sized particles in water which is squeezed between two walls and then made flow ... -
Universal features of the stick-slip dynamics of an intruder moving through a confined granular medium
(2022-04-21)Experiments and simulations of an intruder dragged by a spring through a two-dimensional annulus of granular material exhibit robust force fluctuations. At low packing fractions (φ < φ0), the intruder clears an open ... -
Self-assembly of self-propelled magnetic grains
(2021)In this work, we study bidisperse mixtures of self-propelled magnetic particles of di erent shapes via discrete element method simulations. We show how these particles self-assemble into clusters and how these clusters ... -
On the use of magnetic particles to enhance the flow of vibrated grains through narrow apertures
(2021-06-28)The ow of grains through narrow apertures posses an extraordinary challenge: clogging. Strategies to alleviate the effect of clogging, such as the use of external vibration, are always part of the design of machinery for ... -
Intruder in a two-dimensional granular system: effects of dynamic and static basal friction on stick-slip and clogging dynamics
(2019-10-15)We discuss the results of simulations of an intruder pulled through a two-dimensional granular system by a spring, using a model designed to lend insight into the experimental findings described by Kozlowski et al. [Phys. ... -
Two approaches to quantification of force networks in particulate systems
(2021-02-24)The interactions between particles in particulate systems are organized in ‘force networks’, mesoscale features that bridge between the particle scale and the scale of the system as a whole. While such networks are known ... -
Clogging transition of many particle systems flowing through bottlenecks
(Scientific Reports, 2014)When a large set of discrete bodies passes through a bottleneck, the flow may become intermittent due to the development of clogs that obstruct the constriction. Clogging is observed, for instance, in colloidal suspensions, ... -
Arch based configurations in the volume ensemble of static granular systems
(Journal of Statistical Mechanics: Theory and Experiment, 2015)We propose an alternative approach to count the microscopic static configurations of granular packs under gravity by considering arches. This strategy obviates the problem of filtering out configurations that are not ... -
Structure of force networks in tapped particulate systems of disks and pentagons II Persistence analysis
(American Physical Society, 2016)In the companion paper [Pugnaloni et al., Phys. Rev. E 93, 062902 (2016)], we use classical measures based on force probability density functions (PDFs), as well as Betti numbers (quantifying the number of components, ... -
Experimental proof of faster is slower in systems of frictional particles flowing through constrictions
(American Physical Society, 2015)The “faster-is-slower” (FIS) effect was first predicted by computer simulations of the egress of pedestrians through a narrow exit [D. Helbing, I. J. Farkas, and T. Vicsek, Nature (London) 407, 487 (2000)]. FIS refers to ... -
Apparent mass during silo discharge Nonlinear effects related to filling protocols
(Elsevier, 2017)We study the evolution of the force exerted by a granular column on the bottom surface of a silo during its discharge. Previous to the discharge, we prepare the system using different filling procedures: distributed, i.e. ... -
Clogging transition of vibration driven vehicles passing through constrictions
(American Physical Society, 2017)We report experimental results on the competitive passage of elongated self-propelled vehicles rushing through a constriction. For the chosen experimental conditions, we observe the emergence of intermittencies similar to ... -
Arching during the segregation of two dimensional tapped granular systems Mixtures versus intruders
(Springer, 2014)We present numerical simulations of binary mixtures of granular disks subjected to tapping. We consider the size segregation process in terms of the arches formed by small and big particles. Although arching has been ... -
Effect of particle shape and fragmentation on the response of particle dampers
(SAGE Publications, 2014)A particle damper (PD) is a device that can attenuate mechanical vibrations thanks to the dissipative collisions between grains contained in a cavity attached to the vibrating structure. It has been recently suggested that, ... -
Structure of force networks in tapped particulate systems of disks and pentagons I Clusters and loops
(American Physical Society, 2016)The force network of a granular assembly, defined by the contact network and the corresponding contact forces, carries valuable information about the state of the packing. Simple analysis of these networks based on the ... -
A differential equation for the flow rate during silo discharge Beyond the Beverloo rule
(EPJ Web of Conferences, 2017)We present a differential equation for the flow rate of granular materials during the discharge of a silo. This is based in the energy balance of the variable mass system in contrast with the traditional derivations based ... -
Wang Landau algorithm for entropic sampling of arch based microstates in the volume ensemble of static granular packings
(Papers in Physics, 2015)We implement the Wang-Landau algorithm to sample with equal probabilities the static configurations of a model granular system. The "non-interacting rigid arch model" used is based on the description of static configurations ...