Numerical Simulation Of Scale-effect Of Shear Box Experiment

Granular flow study has been a new hotspot among civil engineers, physicists and computing experts in decades. Gathering from lots of discrete solid particles, the macroscopical behavior of granular flows is much different from solid, liquid and gas in static and dynamic characteristics. Some very interesting phenomena include 'barn effect', 'separating while vibrating' and so on. In the field of environmental hydraulics, study on granular flows can provide fundamental theory to the movement of sediment and other suspended pollutant. This will help us understand the actual principle of these materials' movement in the water.As we all know, there are many physical and nature phenomena belong to the aspects of granular flows such as debris-flow, avalanche, materiel transport and etc. Thus, study on this specific substance flow will help us deepen the cognition of nature, especially in the way of preventing and curing environmental disasters.At present, two-dimensional granular flow simulation has achieved great improvement after many experts' endeavor. Adopting similar principles of gas kinetic theory, scientists have set up the kinetic theory model of granular flows. Those programs, which based on the kinetic theory model and focus on microcosmic features of each particle, reflect the property of physical experiment to a certain extent. Based on the comparison between physical experiments and numerical simulation, this thesis mainly analyzed the shear box's scale effect on shear character of particles under different sizes of shear box, or different sample numbers.