Lattice—Boltzmann两种非均匀网格算法及其对突扩流的模拟

给出了Lattice—Boltzmann方法两种非均匀网格算法（即区域分裂方法和坐标变换方法）及计算步骤。对典型的突扩流问题进行了模拟分析，将所得结果与均匀网格进行比较分析。并对两种非均匀网格算法对流场模拟时进行了比较分析。区域分裂方法的优点在于区域划分过程灵活，对结构形状的要求低。坐标变换方法的优点在于只要对区域建立起合适的曲线坐标，计算过程简单，更节省时间。

Simulation of 2D Sudden-expansion Flow Based on Two Algorithms of Non-uniform Mesh Grids Using Lattice-Boltzmann Method

Two non-uniform mesh grid algorithms (viz the methods based on domain decomposition technique and coordinate transformation technique) for the Lattice-Boltzmann method based on interpola- tion technique, with detailed calculation process, are presented. The simulation of the two-dimensional sudden-expansion flow was carried out in the current study, and the simulated results were then com- pared with the results calculated with the uniform mesh grid algorithm. At the same time, the contrast be- tween the tw...