Sebbah, Hafsa2020-02-022020-02-022019-06-29salle des thèsesMS-530-64-01https://dspace.univ-tlemcen.dz/handle/112/15367By the mean of numerical simulations, we study the segregation in a particular granular system, notably the Brazil Nut Effect. We analyse the results of a vertically vibrated cylinder filled with two distinct granular systems. The first system is a polydisperse pile with a tracer in it, the second one is composed of two piles with different mean sizes of their grains. Apart from an outstanding insensitivity of the reverse of the center of masses in the second experiment to the particle-wall friction coefficient, we clearly see that the segregation in granular media depends on the vibration acceleration and its amplitude, the size ration of the grains, and also on the microscopic friction parameter.frSegregation, Brazil Nut effect, vertical vibration, convection, percolation.Ségrégation, effet des noix de Brésil, vibrations verticales, convection, percolation.Thesis