BGK-NS格式在复杂流动中的应用研究

Research on the application of BGK-NS method to complex flows

作为构造能够同时模拟稀薄和连续流动的混合算法的第一步,本文在前期工作的基础上,考察了气体动理学BGK-NS格式在复杂流动数值模拟中的能力,选取了高超声速再入飞行器大迎角侧向喷流及带栅格翼导弹超声速绕流两个算例。数值模拟结果与实验,以及文献中的计算结果都吻合很好。这充分说明了BGK-NS格式对复杂流动具有良好的模拟能力,也为下一步混合算法的建立打下了良好的基础。

As the first step to construct a hybrid scheme which can simulate continuum flow and rarefied flow simultaneously,the ability of the gas-kinetic BGK-NS scheme in simulating complex flows was tested in this paper based on our previous work.Two benchmark cases were investigated,including the lateral jet on a reentry vehicle in hypersonic freestream at high angle of attack and the supersonic flow around a grid-finned missile.Good agreement was obtained between our results and the experimental and other simulating results in the literature,indicating that the BGK-NS scheme has accuracy and ability to simulate various complex flows,which provides a good basis for our future work on constructing a hybrid algorithm.