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LBGK方法在保留了格子气模型的一些优点的同时,克服了格子气模型的不足之处.应用LBGK方法,可以对更复杂的流体进行模拟.该文讨论了一种九点LBGK模型,并用CHAPMAN－ENSKOG展开方法和多尺度技术证明其在二阶精度上表现为标准的NAVIER－STOKES方程.用该模型对圆柱绕流和管排流动进行模拟的结果显示,该模型能较好地模拟复杂流动现象,并具有一定工程应用背景.“,”Lattice Boltzmann (LB) method, which was developed from Lattice gas (LA) method,maintain some advantage of its parents, and overcome the main shortcoming of the LA. It ismore efficient to simulate the complex fluid flow by LB method. In this paper, a 9-bit squaremodel of Lattice Boltzmann, from which the Navier-Stokes equation can be derived usingChapman-Enskog expansion, is presented. Using this model, the flow around a cylinder andflow through the bank of tubes were simulated. The results show that LB method is efficientto simulate the behavior of complex fluid and valuable engineering.