Cylindrical object contact detection for use in discrete element method simulations. Part I – Contact detection algorithms

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

doi:10.1016/j.ces.2010.08.006

Cited by 126 publications

(53 citation statements)

References 34 publications

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“…[16,18,19]. Snapshots of the simple shear flows at solid volume fraction ν = 0.4 and three different aspect ratios L/d, together with the adopted frame of reference, are depicted in Figs.…”

Section: Simulations and Theorymentioning

confidence: 99%

Stresses and orientational order in shearing flows of granular liquid crystals

et al. 2016

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We perform discrete element simulations of homogeneous shearing of frictionless cylinders and show that the particles are characterized by orientational order and form a granular liquid crystal. For elongated and flat cylinders, the alignment is in the plane of shearing, while cylinders having an aspect ratio equal to 1 and 0.8 show no orientational order. We show that the particle pressure is insensitive to the cylinder aspect ratio and well predicted by the kinetic theory of granular gases, with a singularity in the radial distribution function at contact different from that for frictionless spheres. The numerical results quantitatively agree with physical experiments on different geometries. The particle shear stress is affected by orientational anisotropy. We postulate that, for frictionless cylinders, the viscosity is roughly due to the motion of the orientationally disordered fraction of the particles, and show that it is proportional, through the order parameter, to the expression of kinetic theory. Finally, we suggest that the orientational order is the result of the competing effects of the shear rate, which induces alignment, and the granular temperature, which ramdomizes.

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Section: Simulations and Theorymentioning

confidence: 99%

Stresses and orientational order in shearing flows of granular liquid crystals

et al. 2016

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“…Wires, stem segments and fruit were represented by a cylinder to resemble the shape of the object in reality. Therefore, a collision check with the manipulator or end-effector involved a sphere-cylinder check, which was more time consuming than the sphereesphere checks used for self-collision detection (Kodam, Bharadwaj, Curtis, Hancock, & Wassgren, 2010). …”

Section: Collision Detectionmentioning

confidence: 99%

Analysis of a motion planning problem for sweet-pepper harvesting in a dense obstacle environment

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Roorda

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et al. 2016

Biosystems Engineering

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“…Combined polyhedral (see Nezami et al, 2006;Muth et al, 2007) or cylindrical shapes (see Song et al, 2006;Kodam et al, 2010) are not easily compatible with SHM.…”

Section: Direct Application Of Shm To Demmentioning

confidence: 99%