基于非均匀网格二维突扩流Lattice-Boltzmann方法模拟

Simulation of 2D sudden-expansion flow using the LB method.

将非均匀网格插值方法引入基于Lattice-Boltzmann(LB)方程的d2q9模型,据以模拟二维突扩流,并与LES紊流模型模拟得到的结果进行了比较.结果表明,LB方法与LES模型计算的结果相似,但LB方法计算简单,花费时间也少.因而对于二维突扩流这种复杂流动,用LB方法来模拟较为合适.同时预示了LB方法在河道水流泥沙数值模拟中应用的广阔前景.

The d2q9 model with the new interpolation method on nonunifrom gird, based on Lattice-Boltzmann (LB) equation, is used to simulate a 2D sudden-expansion flow. The results of LB simulation suggest, compared with other models, such as LES model, that precision of LB method is the same as LES model. On the other hand, it gains time and the code of calculation is simple. Although 2D sudden-expansion flow is very complex, the Lattice-Boltzmann method can get good performance. LB method will be also applicable to flow and sediment transport in natural rivers.