多相非牛顿流体驱替过程的格子Boltzmann模拟

将非牛顿流体模型引入多相格子Boltzmann方法（LBM），研究多相非牛顿流体的驱替过程.首先以牛顿流体驱替过程作对照，比较非牛顿流体的驱替特性.然后基于简单结构模型，分析不同界面张力下，非牛顿流体的驱替能力和驱替过程中被驱替相的形态变化规律，揭示界面张力的影响机理.结果表明：界面张力在驱替过程中起阻碍作用，其它参数相同情况下，界面张力越低，流体的驱替能力越强.最后，结合四参数随机生长（QSGS）结构生成方法，模拟不同压差、不同界面张力以及不同润湿性条件下多孔复杂结构内的非牛顿多相驱替过程，分析这些参数对过程的影响.

Lattice Boltzmann Modeling of Non-Newtonian Multiphase Fluid Displacement

Non-Newtonian fluid model is introduced into multiphase LBM to investigate non-Newtonian fluid displacement in porous media. To begin with,process of a Newtonian fluid displaced by pseudo-plastic fluid and Newtonian fluid in a simple pore with a small obstacle is studied. It shows that fluid displaced by pseudo-plastic fluid is faster than that by Newtonian fluid. Besides,interface tension effects on displacement process is investigated in detail. It indicates that interface tension plays a resistant role during displacement process. Lower interface tension enhances displacement. By using quartet structure generation set (QSGS) algorithm,we perform a series of modeling of displacement in porous media systems. Impacts of interface tension,wettability and pressure difference on final production are discussed.