中文摘要：

应用Shan提出的伪势多相模型替代R—K着色模型，建立一种新的描述气液相变过程的格子Boltzmann理论模型，模拟蒸发（高密度转化为低密度）过程．改进了计算效率，且得到较好的计算结果．同时应用该模型从孔隙尺度模拟了多孔介质中的相变现象，验证了该模型模拟复杂相变问题的可行性．

英文摘要：

A lattice Bohzmann model is established to describe liquid-vapor phase transitions using a model proposed by Shan instead of the R-K model. Evaporation from a higher density phase to a lower density phase is simulated. The model improves calculation efficiency and obtains good results. The model is also used to simulate phase transitions in porous media with a pore scale to demonstrate feasibility of the model for complicate phase transition problems.