基于网格/无网格的三维超音速流场数值模拟

该文针对绕三维复杂外形流动的数值模拟，提出了一套基于笛卡尔网格/无网格的混合算法。该算法采用计算效率高的笛卡尔网格覆盖全场，而在计算物体表面及周围邻近区域布置无网格离散点。通过对重叠区域的划分和信息传递，建立各计算区域之间的耦合关系，形成完整的计算系统。为验证混合算法数值模拟的适用性和准确性，该文对超音速圆球绕流进行了计算，将激波的位置、形状与理论分析结果进行了对比。并进一步采用该算法对Ma=2.5、0°~10°攻角下的B1AC2R标准导弹模型进行了计算，获得的气动力系数与实验值基本吻合，表明该文提出的方法可以进行实际工程应用。

NUMERICAL SIMULATION FOR THREE-DIMENSIONAL SUPERSONIC FLOW FIELD BASED ON HYBRID GRID/MESHLESS ALGORITHM

To simulate three-dimensional flow around complex geometrics, a hybrid method based on Cartesian grid and meshless method is presented. In this hybrid method, the efficient Cartesian grid covers the whole computational domain, while a relatively small domain adjacent to the body surface is covered by meshless points. By implementing domain identification and information communication in the overlapping domain, several computational domains are coupled together, and the complicated computational system is formed. To validate the applicability and accuracy of this hybrid method, the supersonic sphere flow is calculated, and the location and the shape of the shock obtained are compared with the empirical formula data. The B1AC2R generic missile at Ma=2.5 and angles of attack 0°~10° is also simulated, the computational results including the aerodynamic coefficients are in a good agreement with the experimental data. It is found that the hybrid method presented is available for actual engineering problems.