Abstract:

A novel variable-scale model is proposed based on lattice gas automata（LGA）to describe the macroscopic behavior through microscopic gas-solid interactions. Flow field is divided into two-deck hexagon lattices of different scales，solid particles and gas pseudo-particles are aligned in the lattices for solid and gas. In addition to basic LGA rules，additional rules of collision and propagation are specifically designed for the gas-solid system. A statistical method of macroscopic properties and the conversion of model parameters with hydrodynamic properties are established. Simulations for the dynamic behavior of gas-solid two phase flow in a fluidized bed with one layer of louver baffle based on this model show good agreements with the experimental results in literature. These calculated results show that the model is feasible and can be efficiently used in engineering community.

摘要：

基于格子气方法，建立了变尺度格子气模型。二维流场空间被离散成两层不同尺度的正六边形网格，固体颗粒和气体粒子分别在各自的网格上运动；设计了气固相作用规则；确定了模型宏观物理量的统计计算方法以及与真实物理量之间的转换关系。用建立的模型对导向挡板流化床内气固两相流的动态行为进行了模拟，数值模拟结果与文献中实验结果吻合较好，表明了建模方法的正确性和模型的有效性，证明该模型有望在工程领域得到应用。