Numerical Modeling of Silo Filling. II: Discrete Element Analyses

Holst, J. M. F. G.; Rotter, J. M.; Ooi, Jin Y.; Rong, Graham H.

doi:10.1061/(asce)0733-9399(1999)125:1(104)

Cited by 62 publications

(27 citation statements)

References 8 publications

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“…It is instructive to compare these static pressure results with a recent series of calculations involving silo filling conducted by different research groups using a variety of discrete-particle computational models [26]. A graph appearing in that paper showing the wall pressure fit to the Janssen result (namely p = a[1 − exp(−bz)], where a and b are constants, and z is the depth below the surface) could be approximated almost equally well by a linear fit, the result obtained here.…”

Section: Energy and Pressure Distributionsmentioning

confidence: 95%

Granular flow from a silo: Discrete-particle simulations in three dimensions

Hirshfeld

Rapaport

2001

The European Physical Journal E

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Molecular (or granular) dynamics methods are used to study the gravity-driven flow of granular material through a horizontal aperture in three dimensions. The grains are spherical and modeled using a short-range repulsive interaction, together with normal and tangential frictional damping forces. The material is contained in a rough-walled cylindrical container with a circular hole in its base, and to permit flow measurements under steady-state conditions a continuous feed approach is employed in which exiting grains are replaced at the upper surface of the material. The dependence of flow velocity and discharge rate on aperture diameter is found to agree with experiment; other quantities such as the kinetic energy and pressure distributions are also examined.

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Section: Energy and Pressure Distributionsmentioning

confidence: 95%

Granular flow from a silo: Discrete-particle simulations in three dimensions

Hirshfeld

Rapaport

2001

The European Physical Journal E

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“…Thus, the goals of this work include the deeping of insight into an important granular system, and the opportunity to explore how well a class of models captures experimental observations. The relevance of this latter issue is underscored by a recent study in which diverse groups modeling flow in a hopper, obtained an equally diverse set of predictions, many of which did not match experiment [21,22,23].…”

Section: Introductionmentioning

confidence: 99%

Comparing simulation and experiment of a 2D granular Couette shear device

et al. 2003

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We present experiments along with molecular dynamics (MD) simulations of a two-dimensional (2D) granular material in a Couette cell undergoing slow shearing. The grains are disks confined between an inner, rotating wheel and a fixed outer ring. The simulation results are compared to experimental studies and quantitative agreement is found. Tracking the positions and orientations of individual particles allows us to obtain density distributions, velocity and particle rotation rate for the system. The key issue of this paper is to show the extent to which quantitative agreement between an experiment and MD simulations is possible. Besides many differences in model-details and the experiment, the qualitative features are nicely reproduced. We discuss the quantitative agreement/disagreement, give possible reasons, and outline further research perspectives.

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“…The numerous studies that tried to predict the pressures in the silo numerically based on an assumption of a particular flow pattern (e.g. Holst et al, 1999a;1999b;Ayuga et al 2001;Sanad et al 2001) have above all demonstrated the great difficulty involved in doing so reliably.…”

Section: Introductionmentioning

confidence: 99%

Steel silos with different aspect ratios: II — behaviour under eccentric discharge

Sadowski

Rotter

2011

Journal of Constructional Steel Research

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The phenomenon of eccentric discharge is widely recognised as the most dangerous condition for thin-walled metal silos and the cause of many catastrophic buckling failures. A realistic pressure model for this condition appears in a regulating standard for the first time in EN 1991EN -4 (2006 on Actions on Silos and Tanks. However the structural consequences of its application are currently largely unknown. The behaviour of a silo subjected to these pressures is certainly very dependent on the aspect ratio of the silo, the granular solid properties and the discharge channel geometry.This paper explores the behaviour of four thin-walled cylindrical silos with stepwisevarying wall thickness and aspect ratios varying from intermediate to very slender, subject to the codified EN 1991-4 eccentric discharge pressures. It is shown that a silo design that was found to be very safe under the EN 1991-4 concentric discharge pressures becomes very unsafe under eccentric discharge. Further, as it is known that the aspect ratio has an important effect on the flow pattern in discharging granular solids, and that slender silos exhibit very different flow patterns from squat silos, it is currently not certain whether a suitable range of aspect ratio over which the codified eccentric discharge model is to be applied has been prescribed in the standard. This paper is the second of a pair. In the first, the behaviour of a set of example silos under the EN 1991-4 concentric discharge condition was studied. The same example silos are studied here under eccentric discharge.

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Numerical Modeling of Silo Filling. II: Discrete Element Analyses

Cited by 62 publications

References 8 publications

Granular flow from a silo: Discrete-particle simulations in three dimensions

Granular flow from a silo: Discrete-particle simulations in three dimensions

Comparing simulation and experiment of a 2D granular Couette shear device

Steel silos with different aspect ratios: II — behaviour under eccentric discharge

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