Abstract
Response of granular material flow to the sudden change of the surface shear force, in other words, the accelerating process of granular assembles, is numerically simulated. The distinct element method, in which the motion of the individual particle is traced directly, is applied. The characteristics of the velocity profile of particles, or the development of the velocity profile in accelerated granular flow is calculated: Furthermore, the relaxation model, which is formulated by convolution integral, is introduced to express the fundamental characteristics of the velocity profile. The physics of such transition is investigated through the simulation data of individual particle motion.
