Hourglass Timing Principle Of Two-dimensional Numerical Simulation Study

Much attention of physicists have been devoted to granular matters in the field of condensed matter in the recent years. However, there are still many phenomena appearing in granular matters cannot be explained completely. In this thesis, we focus on the silo-timing phenomena. It is well known that silo-timing occurs historically for a long time,but the principle of it is obscure.Proposed a new two-dimensional sandpile avalanche model to research the silo-timing based on introducing and studying the computer method of granular materials..The results show that there is a periodic oscillation in granular avalanche process for the flow of entrance granular by this method.The sandpile avalanche relates linearly with time approximately for the flow of different hatches and the slope varies from hatches in the system.Fixed the width of the system ,the total time of avalanche increases linearly with the size of hole approximately and the slope is a constant in the system. The "Beating" of avalanche occur as the entrance is a special place and change periodically with granular height. The results of reseach will offer reference to study granular materials.At the same time,We will further realize the qualities of granular materials.