This paper focus on the numerical method of dense granular flow dynamics in two motion states: quasistatic and rapid movement At first, threshold volume for friction, which joins particles collision and friction stress regimes together, is obtained from the experiment of three kinds of quartz sand accumulation in measuring cylinder by gravity. After that two movement experiments are performed to protrude dense granular flow motion characteristic. One is the experiment of particle's blocking in the L-pipe and the other is the experiment of particles' mixing by impeller for three kinds of quartz sand. The former is regarded as a representative of quasistatic and the latter is treated as a representative of granular flow rapid movement Then two numerical simulations are conducted with the two corresponding experiments and the numerical results are inspected by the experimental data. The mathematical method is employed to describe the difference between the two different models of motion. And then the influence of modificatory friction viscosity equation is investigated in accordance with fact motion. The emphasis is the relationship between numerical method and granular flow motion characteristic. This modificatory method effectively bridges particles collision and friction stress regimes in the sand free fall and expresses the hysteresis quality in the process of dense granular flow motion speedup. (C) 2014 Elsevier B.V. All rights reserved.