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- Luc Oger, M. Ammi, A. Valance, D. Beladjine
- The European physical journal. E, Soft matter
- 2005

We performed numerical simulations of one-bead collision on the surface of a static granular medium. The simulations have been done for two- and three-dimensional packings of beads. The effect of the incident bead velocity, the shot angle, the mechanical parameters and the packing structure are analyzed for ordered and disordered 2D packings and only… (More)

- V. A. Luchnikov, Nikolai N. Medvedev, Luc Oger, Jean Paul Troadec
- Physical review. E, Statistical physics, plasmas…
- 1999

The Voronoi network is known to be a useful tool for the structural description of voids in the packings of spheres produced by computer simulations. In this article we extend the Voronoi-Delaunay analysis to packings of nonspherical convex objects. Main properties of the Voronoi network, which are known for systems of spheres, are valid for systems of any… (More)

- Patrick Richard, Luc Oger, Jean Paul Troadec, A. Gervois
- Physical review. E, Statistical physics, plasmas…
- 1999

By using molecular dynamics simulations on a large number of hard spheres and the Voronoï tessellation we characterize hard-sphere systems geometrically at any packing fraction eta along the different branches of the phase diagram. Crystallization of disordered packings occurs only for a small range of packing fraction. For the other packing fractions the… (More)

- A. Gervois, Luc Oger, Patrick Richard, Jean Paul Troadec
- International Conference on Computational Science
- 2002

The Voronoi tessellation is used to study the geometrical arrangement of disordered packings of equal spheres. The statistics of the characteristics of the cells are compared to those of 3d natural foams. In the case of binary mixtures or polydisperse assemblies of spheres, the Voronoi tessellation is replaced by the radical tessellation. Important… (More)

- D. Beladjine, M. Ammi, Luc Oger, A. Valance
- Physical review. E, Statistical, nonlinear, and…
- 2007

We report on experimental studies of the collision process between an incident bead and a three-dimensional granular packing (made of particles identical to the impacting one). The understanding of such a process and the resulting ejection of particles is, in particular, crucial to describe eolian sand transport. We present here an extensive experimental… (More)

- Patrick Richard, Jean Paul Troadec, Luc Oger, A. Gervois
- Physical review. E, Statistical, nonlinear, and…
- 2001

We study the effect of the anisotropy of the cells on the topological properties of monodisperse two- and three-dimensional (3D) froths. These froths are built by Voronoï tessellation of actual assemblies of monosize disks (2D) and of many numerical packings of monosize disks (2D) and spheres (3D). We show that some topological properties of these froths… (More)

- M. Ammi, Luc Oger, D. Beladjine, A. Valance
- Physical review. E, Statistical, nonlinear, and…
- 2009

We present results of the collision process of a bead onto a static granular packing. We provide, in particular, a three-dimensional (3D) extensive characterization of this process from a model experiment that allows us to propel a spherical bead onto a granular packing with a well-controlled velocity and impact angle. A collision typically produces a… (More)

- Franck Lominé, Luc Oger
- Physical review. E, Statistical, nonlinear, and…
- 2009

We have performed extensive experimental and numerical studies of spontaneous percolation of small beads through an unconsolidated porous media made with large glass beads. In this paper, an experimental setup and a fast "discrete element method" algorithm are presented to deal with large numbers of particles during our interparticle percolation phenomenon… (More)

- Franck Lominé, Luc Oger
- Physical review. E, Statistical, nonlinear, and…
- 2010

A numerical investigation of jamming effect during the spontaneous interparticle percolation process of small beads through an unconsolidated porous media has been performed. The size ratio between the moving beads and the ones building up the porous medium was chosen larger than the geometrical trapping threshold: ξ(c)=(2/√3]-1)(-1)=6.464.... In this… (More)

- Rodolfo Omar Uñac, Luc Oger, Ana María Vidales
- The European physical journal. E, Soft matter
- 2015

The problem of segregation of mixtures in a column of wet disks subjected to tapping is studied through a simple model that simulates, through a pseudo-dynamics algorithm, the formation of the packing and the successive tapping of it. The particles consist in a binary mixture of disks with two different sizes and the capillary forces are simulated… (More)