基于气体动理学格式的平板绕流数值模拟

介绍了基于Bhatnagar-Gross-Krook（BGK）模型的气体动理学格式Gas Kinetic Scheme（GKS）数值算法。给出了平板绕流的物理模型以及边界的处理方式，同时进行了算法准确性验证。对不同雷诺数条件下的单平板绕流进行数值模拟，随雷诺数的增大，涡不断被拉长，逐渐失去对称性，形成卡门涡街；对Re=300的前后平板绕流，当板间距较小时流场处于对称尾流区，没有涡的脱落，当板间距较大时会形成卡门涡街；对Re=300的上下平板绕流，当板间距较小时流场特征与单平板绕流相似，当板间距较大时会形成两列涡，在下游较远处开始逐渐合并。

Numerical Simulation of Flat-Plate Flow Based on Gas Kinetic Scheme

This paper describes the Unified Gas-Kinetic Scheme based on the BGK-Shakhov model. The physical model of the flat flow and the processing method of the boundary were introduced， and the accuracy of the algorithm was verified. The numerical simulation of the flow around a single plate under different Reynolds numbers was carried out. As the Reynolds number increased， the vortex continued to be elongated， gradually losing symmetry， forming a Karman Vortex Street. For the flow around the front and back plates of Re=300， when the plate spacing was small， the flow field was in the symmetrical wake region， and there was no vortex shedding. When the plate spacing was large， Carmen Vortex Street would be formed. For the flow of the upper and lower plates of Re=300， the flow field characteristics were similar with those of a single plate when the plate spacing was small. When the plate spacing was large， two rows of vortices were formed， and gradually merged further downstream.