方柱高超声速绕流的数值模拟

Numerical Simulation of Supersonic Flow Surround a Square Cylinder

基于大涡模拟方法,应用WENO格式以及自适应网格加密(AMR)技术,对来流马赫数Ma=5的超声速方柱绕流进行了数值求解。计算结果清晰地揭示了湍流边界层的分离激波和方柱障碍物上游的弓形激波相互作用的波系结构。通过将模拟结果与实验数据以及其他文献结果比较分析,验证了计算方法的可行性和准确性。同时计算结果还显示了分离区的旋涡结构以及二次涡的形成和发展。另外在模拟中分离区的旋涡结构中出现了八涡结构,这种新的现象有待于实验认证和进一步深入的数值研究分析。

Based on the large eddy simulation,the hyperosnic flow sourround a square cylinder was simulated numerically with the use of WENO scheme and adaptive mesh refinement technique.The shock wave structures generated due to the interaction between separated shock of the turbulent boundary layer and the bow shock in front of the cylinder were shown clearly.The comparison of numerical results with previous experiment data and computational results verifies the simulation method was proposed.The calculated results show the vortices structure in the separation region and the formation and development of second vortices.Eight horse-shoe vortices in the separation region were observed.This new phenomenon needs to be confirmed by the experiments and further study.