A new calculation method for particle motion in tangential direction in discrete element simulations

Zhang, D.; Whiten, W. J.

doi:10.1016/s0032-5910(98)00209-5

Cited by 17 publications

(11 citation statements)

References 5 publications

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“…placements [2,[7][8][9][10][11][26][27][28][29][30][31][32]. These relative displacements are expressed by using position vectors and vectors fixed at respective particles.…”

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confidence: 99%

Restructuring of colloidal aggregates in shear flow

et al. 2012

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Abstract. A method to couple interparticle contact models with Stokesian dynamics (SD) is introduced to simulate colloidal aggregates under flow conditions. The contact model mimics both the elastic and plastic behavior of the cohesive connections between particles within clusters. Owing to this, clusters can maintain their structures under low stress while restructuring or even breakage may occur under sufficiently high stress conditions. SD is an efficient method to deal with the long-ranged and many-body nature of hydrodynamic interactions for low Reynolds number flows. By using such a coupled model, the restructuring of colloidal aggregates under shear flows with stepwise increasing shear rates was studied. Irreversible compaction occurs due to the increase of hydrodynamic stress on clusters. Results show that the greater part of the fractal clusters are compacted to rod-shaped packed structures, while the others show isotropic compaction.

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“…placements [2,[7][8][9][10][11][26][27][28][29][30][31][32]. These relative displacements are expressed by using position vectors and vectors fixed at respective particles.…”

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confidence: 99%

Restructuring of colloidal aggregates in shear flow

et al. 2012

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“…As described in the paper [36], a simple way to calculate the switching time is to use a linear approximation method.…”

Section: Solution Proceduresmentioning

confidence: 99%

Using the fractional interaction law to model the impact dynamics of multiparticle collisions in arbitrary form

Leszczyński

2004

Phys. Rev. E

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Using the molecular dynamics method, we examine a discrete deterministic model for the motion of spherical particles in three-dimensional space. The model takes into account multiparticle collisions in arbitrary forms. Using fractional calculus we proposed an expression for the repulsive force, which is the so called fractional interaction law. We then illustrate and discuss how to control (correlate) the energy dissipation and the collisional time for an individual particle within multiparticle collisions. In the multiparticle collisions we included the friction mechanism needed for the transition from coupled torsion-sliding friction through rolling friction to static friction. Analysing simple simulations we found that in the strong repulsive state binary collisions dominate. However, within multiparticle collisions weak repulsion is observed to be much stronger. The presented numerical results can be used to realistically model the impact dynamics of an individual particle in a group of colliding particles.

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“…In DEM, the forces resulting from a contact between two particles are related to their virtual overlap by a contact force model. The overall contact force can be decomposed into a normal component (perpendicular to the contact surface) and a tangential component (parallel to the contact surface) (Zhang and Whiten , , ; Zhang and Vu‐Quoc 2002a,b; Mao et al . ; Raji and Favier 2004a,b; Van Zeebroeck et al .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Properties of Golden Delicious and Red Delicious Apple under Normal Contact Force Models

Barikloo

Ahmadi

2013

Journal of Texture Studies

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Dynamic forces cause the most bruise damage during fruit transport and handling. In order to reduce this damage, it is necessary to model the impact forces. Limited information is available in the literature about the behavior dynamic and dynamic modeling for apple. The normal force‐displacement relationship between a viscoelastic sphere (fruit apple) and an impactor was analyzed using the Kuwabara and Kond and Tsuji models as normal force models. Fruits were subjected to dynamic loading by means of a pendulum at impact levels. In order to estimate the parameters (spring, “k” and damping, “c”) of the mentioned models for normal impacts, the nonlinear least squares technique (optimization method) was used. Practical Applications A very promising approach for the simulation of fruit impact damage during transport and handling is the contact force discrete element method (DEM). In order to do so, models for the forces acting between particles (like fruits) in contact need to be specified. Forces acting between the two particles are decomposed into normal and tangential components. In this paper, the focus is set on normal contacts. The presented research determines the parameters of normal contact forces models suited for DEM simulation of viscoelastic materials (fruit).

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A new calculation method for particle motion in tangential direction in discrete element simulations

Cited by 17 publications

References 5 publications

Restructuring of colloidal aggregates in shear flow

Restructuring of colloidal aggregates in shear flow

Using the fractional interaction law to model the impact dynamics of multiparticle collisions in arbitrary form

Dynamic Properties of Golden Delicious and Red Delicious Apple under Normal Contact Force Models

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