基于Lattice Boltzmann方法的圆柱绕流大涡模拟

LARGE EDDY SIMULATION OF FLOW PAST A CIRCULAR CYLINDER BASED ON LATTICE BOLTZMANN METHOD

Lattice Boltzmann(LB)方法是近年来出现的一种流体计算的新方法,在流体力学及相关领域取得了很大的成功。但LB方法在模拟湍流流动时常常引起计算的不稳定。本文基于一种结合大涡模型的LB方法对圆柱绕流问题进行的模拟,并与其他文献的实验结果和计算结果进行对比。计算表明:这种混合LB方法能获得比较满意的结果。

The lattice Boltzmann(LB) method is a new method for computational fluid dynamics, and has achieved great success in fluid dynamics and related fields. However, as applied to turbulent flows, the LB method often encounters numerical instability. In this paper, the flow over a circular cylinder is simulated based on the LB method coupled with a large eddy model. Comparison with other experimental and numerical results are also performed. It is shown that the agreement is satisfactory.