Numerical Modeling of Silo Filling. I: Continuum Analyses

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

doi:10.1061/(asce)0733-9399(1999)125:1(94)

Cited by 58 publications

(15 citation statements)

References 13 publications

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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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Section: Introductionmentioning

confidence: 99%

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

et al. 2003

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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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“…It has also been used to determine the pressures on hopper walls (Haussler and Eibl, 1984;Rotter, 1990, 1991;Meng et al, 1997;Rotter et al, 1998;Holst et al 1999;Hjelmstad and Taciroglu, 2000;Keiter and Rombach, 2001). In the present study, the development of pressures on the wall of a shallow hopper was studied during the filling phase.…”

Section: Introductionmentioning

confidence: 99%

Normal pressures and frictional tractions on shallow conical hopper walls after concentric filling: Predictions and experiments

Ding

Rotter

Ooi

et al. 2013

Chemical Engineering Science

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A silo with a shallow hopper is designed to achieve the required silo capacity when the headroom available is limited, provided that the issue of segregation of stored particulate solids is not a problem. Several analytical models have been proposed to try to predict the design loads for such shallow silo hoppers to guarantee their structural integrity. In this study, a novel finite element analysis has been conducted to explore the development of pressures and tractions on the wall of a full scale shallow hopper when it is filled with sand. Simple meshes were used to represent the sand and the hopper wall. Coulomb friction modelled the interaction between the sand and the wall. The process of progressive filling was simulated by temporarily suspending and then re-activating appropriate parts of the mesh. The two computational models of "switched-on filling" and "progressive-filling" were used to determine whether

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Numerical Modeling of Silo Filling. I: Continuum Analyses

Cited by 58 publications

References 13 publications

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

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

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

Normal pressures and frictional tractions on shallow conical hopper walls after concentric filling: Predictions and experiments

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