A. Gervois

  • Citations Per Year
Learn More
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)
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)
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)
We propose a theoretical model of random binary assemblies of discs which is the extension at any packing fraction of a model previously described by Dodds for dense packings. In dilute assemblies, the notion of contact between the grains must be replaced by that of neighbourhood of the grains. We define the neighbours of a disc through the radical(More)
Three-dimensional (3D) disordered media may be studied by performing random planar cuts through the material and trying to go back to 3D geometry from two-dimensional information. We have studied from this point of view numerical packings of spheres of two sizes for which the radii of the spheres and the composition of the mixtures have been obtained from(More)
We study by numerical simulation the progressive densification of assemblies of equal regular polygons (pentagons and heptagons). We follow the evolution of the packing fraction, of the coordination numbers and of the void space structure during the densification. At high packing fraction (C m~ 0.83), ordered zones appear. This can be compared with what(More)
2014 Intercepts generated through granular packings by random 1D (line) sections may provide information on the geometry of the medium in a simpler way than metallographic cuts. The method, already tested on hard monosize spherical grain stackings, is used here to determine the average number of necks per grain of a classical model for slightly sintered(More)
  • 1