A local mixing particle-in-cell method for fluid-particle multiphase flows
多相流局部混合型质点网格法

In this paper, a local mixing particle-in-cell method is proposed for multiphase flows. The method can be used for dense particle flows. Under the grid of particle parcel scale, which is called as Euler cell in this paper, the total particle volume in the cell is calculated directly based on the Lagrangian method. Therefore the particle volume fraction (concentration) on the Euler cell and the fluid control volume can be obtained accurately. Meanwhile, at new time step, particles on the Euler cell are assumed to be mixing sufficiently and come into being a new parcel. Comparing with the previous methods, the proposed method is more efficient and accurate. For the sedimentation in vertical and inclined vessels, and the bimodal suspension in a vertical vessel, the numerical results agree with the experimental results.