采用Eulerian／Lagrangian方法模拟直方槽道中气粒两相流动过程。气相采用大涡模拟方法,直接求解大尺度涡运动,小尺度涡采用标准的Smagorinsky亚格子模式模拟,壁面采用幂次率应力模型代替无滑移边界条件。颗粒相采用轨道模型求解。大涡模拟预报的气相平均速度与DNS结果相吻合。结果表明,在直方槽道流向截面,气相存在二次流现象。受气相二次流的作用,颗粒相也存在类似于气相的二次流现象,并考察了重力对颗粒相二次流的影响。 Eulerian / Lagrangian simulation of gas - particle two - phase flow in a straight channel. Large-scale eddy motion is directly solved by large-eddy simulation in gas phase. Small-scale eddy simulation is carried out by using standard Smagorinsky sub-lattices model. The power-rate stress model is used instead of the non-slip boundary condition. The particle phase is solved using the orbit model. The average vapor velocity predicted by large eddy simulation is consistent with the DNS results. The results show that there is secondary flow in the gas flow in the cross section of the straight channel. Due to the effect of gas-phase secondary flow, the secondary phase phenomenon similar to the gas phase exists in the particle phase, and the influence of gravity on the secondary flow of the particle phase is also investigated.