Abstract: A variable-scale lattice gas automata model for gas-solid two-phase flow is established based on lattice gas automata (LGA)in which macroscopic behavior is described with microscopic gas-solid interactions.A two-dimensional flow field is divided into two.deck hexagon laRiees with different scales,where solid particles and gas pseudo-particles are aligned in lattices for solid and gas respectively.In addition to basic LGA rules.collision and propagation rules ale specifically designed for gas-solid systems,as well as additional evolution rules.A statistical method of macroscopic properties and conversion between model parameters and hydrodynamic properties based on similarity principle aIe established. Simulations of dynamic behaviors of gas-solid two-phase flow in a bubbling fluidized bed with this model show good agreement with experiments as well as simulation results with a two-fluid model.It has less average deviation,which validates the proposed model.

Key words: scale, lattice gas automata, gasolid two-phase flow, bubbling fluidized bed, simulation