ABSTRACT
The behavior of a granular flow is extremely difficult to understand because of the difficulty of measuring macroscopic quantities such as stress tensors. Therefore, the main interest in this study is to understand boundary and particle size effects on simple dry granular materials composed of inelastic spheres flowing between parallel, bumpy walls in the absence of gravity. In this study, the Particle Dynamics Method is used to obtain macroscopic information. A computational cell is composed of periodic boundaries in lateral directions and non-periodic boundaries in vertical directions. The non-periodic boundaries, that is, the upper and lower walls have constant velocities in lateral directions in order to transfer the momentum to the flow particles in the computational cell. The walls are made bumpy or roughened by affixing half-spheres to the walls to analyze how these boundaries and particle sizes affect computed wall stresses.
