NUMERICAL SIMULATION OF THE FORMATION OF SHALLOW GAS SPILLING IN SANDS

Based on the A. Nermoen's physics experiment, this article simulates the formation of shallow gas spilling. Different from the Euler-Euler method, this article uses a new discrete particle simulation method MP-PIC model that is based on Euler-Lagrange method. This article revealed the mechanism of overpressure gas release and the change and regular of velocity and pressure in the formation process of the shallow gas. The simulation results show that the fluidization of particles and the formation, movement and spray of bubbles are consistent with the experimental phenomenon. The correlation coefficient between the calculated results and the experimental data is 0.94, which is a good correlation. The critical fluidization velocity and pressure are positively correlated with the height of soil. The critical fluidization pressure is close to the experimental results. However, because of some other external forces which are not considered, such as the force of Magnus force, the critical fluidization velocity is lower than that of the experiment. The model can deal with particles of arbitrary size, which is suitable for enormous particle quantity and tightly coupling the interaction between liquid and solid. Good applicability and High accuracy of this model provide convenience for numerical simulation.