2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/30054We present a description of granular dynamics based on the idea of differentiation between fluid and solid components. First, we construct a model of completely fluidized phase. Then we discuss a shear surface motion on the boundary of the bulk solid phase, induced by a moving wall. Our results include the thickness dependence of the velocity of a developed avalanche, density and velocity profiles in granular Couette flow experiment.4 pages, 2 figuresSoft Condensed MatterDisordered Systems and Neural Networkstext