三维格子涡方法模拟自由下落颗粒群

Numerical Simulation of Free Falling Particles by Three-Dimensional Vortex-in-Cell Method

本文发展了基于双向耦合的三维格子涡方法,采用涡方法模拟流场中的涡量变化及涡元运动,使用双势法求解速度场,采用拉格朗日方法跟踪颗粒相.利用该模型模拟了颗粒群的自由下落及下落过程引起的气相流动,模拟结果与实验吻合良好。结果显示空气相速度径向分布满足高斯分布,颗粒相流量对颗粒群的扩散影响不显著,而流量增大会引起颗粒速度的增大.

In present paper a three-dimensional Vortex-In-Cell method concerning the two-way coupling is developed for gas-solid flow induced by particles free falling. The vorticity equation is solved by the vortex method, and the gas velocity field is solved by the dual-potential method, while particles are tracked in Lagrangian frame. The simulation of free falling particles and induced air flow demonstrates that the radial velocity of air satisfies Gaussian distribution. It also confirms that the particle flow rate has little influence on the spread of particles, while particle velocity increases with increasing the particle flow rate.