(70dq) Numerical Simulation of Dust Lifting behind Shock Waves in a Three-Dimensional Computational Domain

This work presents thee-dimensional simulations of a dust lifting process using the Eulerian-Lagrangian modelling technique. The topic of dust lifting behind shock waves has been the subject of numerous research activities during the recent years. Most of the papers discussing this process address the issue of the mechanisms responsible for the entrainment of dust and creation of a particle cloud behind shock waves. The majority of them present numerical simulations of the process using the Eulerian-Eulerian or the Eulerian-Lagrangian approach in a two-dimensional domain. Literature shows that, so far, the Eulerian-Lagrangian approach has proven to be the more successful technique in describing the process, because it can account more realistically for particle-particle, particle-wall and gas-particle interactions. These interactions are very significant in determining the character of the process, and should not be neglected. Extending this type of research to a three-dimensional configuration is becoming feasible with the increase in computational power, and contributes to a better understanding of the mechanisms behind dust lifting, as it is closer to a real-life scenario. The results of the simulations are shown as snapshots of particle position at certain points in time after the passage of the shock wave. The influence of two-way coupling on the gas and particle motion is studied, as well as its sensitivity to the numerical grid. Also, statistical data for the particle positions and collisions are presented. These are: the mean square displacement of the particles, resolved in the horizontal and vertical directions, and the number of recorded particle-particle collisions, both plotted as functions of time. Comparisons of the results with two-dimensional results are made.