Cylindrical object contact detection for use in discrete element method simulations, Part II—Experimental validation

Kodam, Madhusudhan; Bharadwaj, Rahul; Curtis, Jennifer; Hancock, Bruno C.; Wassgren, Carl

doi:10.1016/j.ces.2010.08.007

Cited by 102 publications

(42 citation statements)

References 35 publications

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“…However, as the parallel computation techniques [30,31] have been developed for some DEM codes, this problem will finally be overcome. Though the composite particle model has been employed in simulating specific shapes of grains, such as cubes [32], polyhedron [15], cylinders [33] and sphero-cylinders [34], the real soil particle shapes are far more complicated than those specified in numerical models. Thus, the current study uses random functions in generating sphere clumps, so that different angular particles can be simulated in the DEM.…”

Section: Introductionmentioning

confidence: 99%

A composite particle model for non-spherical particles in DEM simulations

Zhao

Dai

et al. 2015

Granular Matter

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This paper presents a composite particle model with sphere clumps for modelling non-spherical particles in discrete element method (DEM) simulations. The formulation of the sphere clumps uses random selections of particle radii and positions, thus it can theoretically simulate all possible non-spherical particles encountered in engineering projects. In this study, the generation of sphere clumps in space was discussed in detail, and different particle nonsphericities were compared. This numerical model has been employed to study the shear behaviour of granular assemblies under undrained triaxial compression conditions. It is evident that the use of composite particle model in the DEM can largely increase the shear strengths of granular assemblies. For granular samples consisting of various types of sphere clumps, different mechanical responses have been observed. In particular, the sphere clumps with high non-sphericity can lead to very high peak/residual shear strength, and high material internal friction angle. The use of sphere clumps mixture can modulate the shear behaviour, with its mechanical properties being close to those of real quartz sand grains.

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Section: Introductionmentioning

confidence: 99%

A composite particle model for non-spherical particles in DEM simulations

Zhao

Dai

et al. 2015

Granular Matter

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“…Figure 5: a: Fibre-wall impact presenting the sphero-cylinder and its corresponding rectangular cylinder. b: Comparison of simulation results to an analytical solution for rectangular cylinders [28]. Translational vx + and rotational z + velocity for different inclination angles .…”

Section: Contact Force and Torquementioning

confidence: 99%

Modeling of Non-Spherical, Elongated Particles for Industrial Suspension Flow Simulation

Redlinger-Pohn¹,

König²,

Kloss³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Euler-Lagrange (EL) simulations of particulate suspension flow are an important tool to understand and predict multiphase flow in nature and industrial applications. Unfortunately, solid-liquid suspensions are often of (mathematically) stiff nature, i.e., the relaxation time of suspended particles may be small compared to relevant flow time scales. Involved particles are typically in the size range from µm to mm, and of non-spherical shape, e.g., elongated particles such as needle-shaped crystals and/or natural and man-made fibres. Depending on their aspect ratio and bending stiffness, those particles can be treated as rigid, or flexible. In this paper we present a recent implementation into the open-source LIGGGHTS ® and CFDEM ® software package for the simulation of systems involving stiff non-spherical, elongated particles. A newly implemented splitting technique of the coupling forces and torques, following the ideas of Fan and Ahmadi (J. Aerosol Sci. 26, 1995), allows significantly larger coupling intervals, leading to a substantial reduction in the computational cost. Hence, large-scale industrial systems can be simulated in an acceptable amount of time. We first present our modeling approach, followed by the verification of our code based on benchmark problems. Second, we present results of one-way coupled CFD-DEM simulations. Our simulations reveal segregation of fibres in dependence on their length due to fibre-fluid interaction in torus flow. 586

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“…Most DEM simulations either utilize force models intended for spheres, such as the common implementation of the Hertzian elastic normal force model, or utilize simplified models, such as a linear spring of constant stiffness . If nonspherical particles are implemented, however, the contact stiffness will change with the location of the contact point as the local radii of curvature vary, in general.…”

Section: Introductionmentioning

confidence: 99%

Influence of normal contact force model on simulations of spherocylindrical particles

et al. 2018

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How the choice of elastic normal contact force model affects predictions from discrete element method simulations of spherocylindrical particles is investigated in this article. Three force models were investigated: (1) a Hertzian force model (HFM) which assumes a circular contact area; (2) a linear force model (LFM) with a constant stiffness; and (3) a modified HFM (MFM) that accounts for various contact areas and contact transitions. With the MFM, transitions between contact area types must be accounted for otherwise discontinuities in the contact force can occur. It is found that simple force models (HFM, LFM) can be substituted for more accurate force models if only force data and bulk properties are of interest. However, if more detailed contact information, such as contact area, contact overlap, contact duration, or collision frequency, are needed, for example, in population balance models and transient liquid bridge modeling, then a more accurate force model should be used. The red band is the range of angles reported in the literature by B€ orzs€ onyi et al., 40 Guo et al., 41 and Hua et al. 4 [Color figure can be viewed at wileyonlinelibrary.com]

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Cylindrical object contact detection for use in discrete element method simulations, Part II—Experimental validation

Cited by 102 publications

References 35 publications

A composite particle model for non-spherical particles in DEM simulations

A composite particle model for non-spherical particles in DEM simulations

Modeling of Non-Spherical, Elongated Particles for Industrial Suspension Flow Simulation

Influence of normal contact force model on simulations of spherocylindrical particles

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