Calibration and interpretation of DEM parameters for simulations of cylindrical tablets with multi-sphere approach

Cabiscol, Ramon; Finke, Jan Henrik; Kwade, Arno

doi:10.1016/j.powtec.2017.12.041

Cited by 77 publications

(28 citation statements)

References 28 publications

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“…Coarse-graining shows the local distribution of the porosity in the Jenike shear tester. Fig.19a presents the results for MS (8), with φ init =0.5, at D = 6 mm. It can be seen that the lowest porosity is formed from top right to bottom left corner.…”

Section: Porositymentioning

confidence: 99%

“…It should be noted that due to the limitation of the displacement in the Jenike tester, the residual strength of the dense samples has not been fully recorded for the particles with the highest amount of bumpiness and blockiness (i.e. MS (8) and SQ (N 6) and (N 8)). Accordingly, an alternative way is followed to compare the shear strength of the samples: we compared the peak friction angle (Φ p ), which is obtained through dividing the maximum value of τ by σ n .…”

Section: Shear Strengthmentioning

confidence: 99%

“…Most DEM codes use spherical particles to reduce the computational cost of the simulations, although in reality particles are mostly of irregular shape. Several non-spherical shape descriptors have been proposed in the literature, the most popular approach in DEM being the multi-sphere approach (MS) [2,3,4,5,6,7,8]. In this description, spheres are allowed to overlap and be glued together to approximate an arbitrarily shaped particle.…”

Section: Introductionmentioning

confidence: 99%

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DEM study of mechanical characteristics of multi-spherical and superquadric particles at micro and macro scales

et al. 2018

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Multi-spheres and Superquadrics are popular approaches for addressing particle shape effect in the Discrete Element Method (DEM). This study focuses on the mechanical characteristics of cubical particles, modelled by the two methods (using EDEM and LIGGGHTS), through conducting a series of numerical case studies at both single particle and bulk levels. In the first part of the study, several testing scenarios, which clarify the impact, interlocking, sliding and tilting characteristics of the particle, are discussed and the respective simulations are carried out. The results emphasize the importance of surface bumpiness and edge sharpness in the single-particle behaviour and are used for informing the bulk response. Further, role of the two shape descriptors on bulk response is evaluated in angle of repose, Jenike shear and silo flow simulations. The results of these tests are assessed both at the micro, directly through DEM outputs, and at the meso-and macro-scales, using a coarse graining technique. It is seen that the properties of edge and surface in superquadric and multi-sphere particles considerably influence the heap profile in the angle of repose test. However, in a Jenike direct shear, the shape complexity only significantly affects the shear strength, porosity and mode of motion when the packing is dense. Additionally, in silo discharge, the effect of shape features is even less on the flow pattern and mass flow rate but is found to have a significant influence on the stress distribution.

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Section: Porositymentioning

confidence: 99%

Section: Shear Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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DEM study of mechanical characteristics of multi-spherical and superquadric particles at micro and macro scales

et al. 2018

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“…To accurately represent a non-spherical particle with a spherical particle requires careful selection of contact parameters. Attempts has also been made to use a multisphere approach to model non-spherical particles with the DEM [7]. A multi-sphere approach can be appropriate, but the authors still emphasize the difficulty and limitation of the method: the difficulty in calibrating micro-scale parameters for the DEM models.…”

Section: Introductionmentioning

confidence: 99%

The particle finite element method for transient granular material flow: modelling and validation

et al. 2020

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The prediction of transient granular material flow is of fundamental industrial importance. The potential of using numerical methods in system design for increasing the operating efficiency of industrial processes involving granular material flow is huge. In the present study, a numerical tool for modelling dense transient granular material flow is presented and validated against experiments. The granular materials are modelled as continuous materials using two different constitutive models. The choice of constitutive models is made with the aim to predict the mechanical behaviour of a granular material during the transition from stationary to flowing and back to stationary state. The particle finite element method (PFEM) is employed as a numerical tool to simulate the transient granular material flow. Use of the PFEM enables a robust treatment of large deformations and free surfaces. The fundamental problem of collapsing rectangular columns of granular material is studied experimentally employing a novel approach for in-plane velocity measurements by digital image correlation. The proposed numerical model is used to simulate the experimentally studied column collapses. The model prediction of the in-plane velocity field during the collapse agrees well with experiments.

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“…DEM has been used in a wide variety of applications such as powders [162], ceramics [214], granular flows [36], pharmaceutical and food industries [25,197]. Despite the fact that DEM is a very efficient tool to study these applications, modeling of confined high to extreme compression with DEM is still a challenge.…”

Section: Introductionmentioning

confidence: 99%

Elasticity and Wave Propagation in Granular Materials

Taghizadeh¹

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Calibration and interpretation of DEM parameters for simulations of cylindrical tablets with multi-sphere approach

Cited by 77 publications

References 28 publications

DEM study of mechanical characteristics of multi-spherical and superquadric particles at micro and macro scales

DEM study of mechanical characteristics of multi-spherical and superquadric particles at micro and macro scales

The particle finite element method for transient granular material flow: modelling and validation

Elasticity and Wave Propagation in Granular Materials

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