格子Boltzmann　BGK模型中的矩方程

Some Moment Equations of Lattice Boltzmann BGK Model

应用Chapman－Enskog展开和多重尺度技术求取二阶、四阶粘性系数及三阶色散系数；给出Navier－Stokes方程所要求的平衡态分布函数的高阶矩形式．

Using Chapman-Enskog expansion and multiscale technique, we obtained the 2nd order viscosity, the 3rd dispersion coefficents and the 4th order viscosity. Some higher order moment equations of equilibrium distribution function needed in Navier-Stokes equation.