Home – Home – Jornals – Thermophysics and Aeromechanics 2001 number 4

A method is proposed for the computation of gravity flow of a high-concentration granular medium. A model of nonlinearly viscous fluid is used as a granular medium model. A peculiarity of the model for granular medium motion is a more accurate formulation of boundary conditions, which enables us to account for the sliding of particles on rigid surfaces by introducing an empirical coefficient at the determination of vorticity on a wall. The comparison of numerical and experimental data has shown that the consideration of the effect of medium "sliding" on the boundary enables us to describe the granular medium motion with the rheological parameters of the model being close to those of the Newton fluid. The proposed method has been applied for the  analysis of gravity flows in vertical channels in the presence of obstacles of various forms. The prospects for the developed approach at the theoretical investigation of a free-flowing granular medium are confirmed by a comparison with experimental data known in literature. P. 519-528