Discrete element models for non-spherical particle systems: From theoretical developments to applications

Lu, GX; Third, J. R.; Müller, Christoph R.

doi:10.1016/j.ces.2014.11.050

Cited by 485 publications

(203 citation statements)

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“…A multiscale model was applied in the DEM method in [7] for determining the impact of the crushed material on the flow patterns of granular inside-the-chamber milling fill of the tumbling mills. In article [8], authors applied the DEM method for the systems of non-spherical particles in order to determine flow patterns of granular fill of the rotating chamber. Using graphics processors in the DEM method allowed authors in [9] to determine the influence of relative size of the particles on velocity distribution of flow patterns of the fill in a chamber that rotated at low velocity.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Modeling a flow pattern of the granular fill in the cross section of a rotating chamber

Naumenko

2017

EEJET

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Modeling a flow pattern of the granular fill in the cross section of a rotating chamber

Naumenko

2017

EEJET

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“…At single particle level, Song et al [23] investigated this for tablet-shaped particles, where the shape was represented by 10,26,66 and 178 mono size spheres. They analysed the magnitude of angular velocity of a tablet upon impact on to a stationary tablet.…”

Section: Introductionmentioning

confidence: 99%

“…Lu et al [10] have recently provided a comprehensive review on approaches for consideration of non-spherical particles in DEM.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle shape on flow in discrete element method simulation of a rotary batch seed coater

et al. 2016

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In the seed processing industry, rotary batch seed coaters are widely used for providing a protective coating layer (consisting of various ingredients including fertilisers and crop protection chemicals) on the seeds. Seed motion and mixing are important in ensuring uniform coating. In the batch seed coater, the base of a cylindrical vessel rotates, whilst the cylindrical wall is stationary and two baffles turn the bed over for mixing. In the present study, the Discrete Element Method (DEM) is used to simulate the effect of particle shape on motion and mixing in this device. Corn seed is used as a model material and the effect of its shape on motion is analysed by considering two approaches: (1) manipulation of rolling friction to account for shape as it is commonly used in the field; (2) approximation of the actual shape by a number of overlapping spheres of various sizes. The geometry of corn seeds is captured using X-Ray micro tomography and then the ASG2013 software (Cogency, South Africa) is used to generate and optimise the arrangement of the overlapping spheres. A comparison is made of the predicted tangential and radial velocity distributions of the particles from DEM and those measured experimentally. It is concluded that for rapid shearing systems with short collisional contacts a small number of clumped spheres suffices to provide a reasonable agreement with experimental results. Equally well, manipulating the rolling friction coefficient can provide results that match experiments but its most suitable value is unknown a priori, hence the approach is empirical rather than predictive. 2

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“…and to perform efficient contact detection for these more complex geometries. However, we do not review these state of the art techniques as these have already been comprehensively addressed [71,72,[75][76][77][78][79][80].…”

Section: Discrete Element Methods (Dem)mentioning

confidence: 99%

“…Using high performance GPU's, [73] investigated the size effects in granular mixture flows, whereas [74] used it to simulate fractures in heterogeneous media. Additionally, to bridge the gap between ideal and realistic mixtures, studies have also considered to simulate non-spherical particles using the GPU-based framework, see [75] for triangular particles, [76,77] for convex polyhedrals.…”

Section: Segregation Modelsmentioning

confidence: 99%

Polydisperse granular flows over inclined channels

Tunuguntla¹

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POLYDISPERSE GRANULAR FLOWS OVER INCLINED CHANNELS DISSERTATIONto obtain the degree of doctor at the University of Twente, on the authority of the rector magnificus, Prof. dr. H. Brinksma, on account of the decision of the graduation committee, to be publicly defended on Friday 9 October 2015 at 16:45 hrs by Deepak Raju Tunuguntla born on the 3rd of November 1986 in Hyderabad, India. Granular materialsEverything seems simpler from a distance. -Gail TsukiyamaMatter exists in a variety of forms, of which granular materials -although simplebehave differently from any of the other standard forms (solid, liquid and gas). For example, a sand castle appears like a solid, which when tumbled upon, crumbles down like an avalanche. On a few occasions, this avalanche takes down the whole castle, whereas sometimes it is confined only to a thin layer on its surface (liquid). In another example, shake up some crushed ice in a cocktail mixer and it behaves like a gas, whereas when trying to pour some salt out of an orifice of a jar, the flow tends to choke and gets clogged at the orifice. Granular material has it all, solid, liquid, gas, plastic flow, glassy, etc. -it can mimic all of these behaviours. Thus exhibiting a prime reason for investing our interest in understanding these simple but, mysterious materials. HistoryOur knowledge of granular matter dates back to an era even before mankind's existence. These materials exist on a range of scales -micron sized to planetary -in a variety of forms, exhibiting multitudes of interesting phenomena. The earliest encounter between man and granular matter happened in the surroundings in which he evolved, i.e. with soil, sand, stones, rocks, etc., but more importantly it was his need for survival that ultimately led to an inevitable bond between humanity and granular matter, existing till today. Historical records indicate that primitive men often settled along the river banks where fresh food was available throughout the year. However, due to climatic changes coupled with migration of primitive tribes, new food gathering methods had to be devised. Man needed to find some way to store the nutrients for periods of time when no fresh food was available. Seeds, such as cereal grains, seemed to be one way to solve 1 1 2 Introduction Figure 1.1: Facsimile of a famous scene from a wall painting on the tomb of Djehutihotep, a pharoah (circa 1932(circa -1842. It illustrates his huge monolithic statue being transported from the quarries. In the front of the statue (near the feet) we see a workman pouring water to lubricate the sand, helping the four rows of workmen, 43 men in each, to haul the sledge smoothy (less friction). The figure is adapted from Dowson [1].the storage problems. Ultimately around 8000 BCE, during neolithic revolution, this seed storage led man towards becoming more agriculturally oriented. Grains were likely among the first cultivated crops. They could be grown relatively easily, farmed in surplus quantities and were suitable for storage in harsh cold winter climat...

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Discrete element models for non-spherical particle systems: From theoretical developments to applications

Cited by 485 publications

References 242 publications

Modeling a flow pattern of the granular fill in the cross section of a rotating chamber

Modeling a flow pattern of the granular fill in the cross section of a rotating chamber

Effect of particle shape on flow in discrete element method simulation of a rotary batch seed coater

Polydisperse granular flows over inclined channels

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