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发展了一种基于几何外形的非结构自适应多重网格技术。根据流场参数的变化梯度确定加密边,由加密准则对粗网格进行自适应剖分得到分布合理的较密网格。通过预先生成的初始极密表面网格来将边界网格的加密点投影到边界上,使得边界保持初始外形。为了提高流场求解速度,将自适应加密后的一系列网格作为多重网格,采用了多重网格算法进行计算。M6机翼的流场计算表明该方法可以准确捕捉激波位置,并且表面的压力系数分布与实验值相吻合。
A non-structural adaptive multi-grid technique based on geometric shape is developed. According to the gradient of the flow field parameters, the encryption edge is determined, and the coarse mesh is adaptively partitioned by the encryption criterion to obtain a dense mesh with reasonable distribution. The encrypted points of the boundary grid are projected onto the boundary through a pre-generated initial very dense surface mesh, so that the boundary maintains the initial shape. In order to improve the solution speed of flow field, a series of grids adaptively encrypted are regarded as multiple grids, and a multiple grid algorithm is used for calculation. The calculation of the flow field of M6 wing shows that this method can accurately capture the position of shock wave and the pressure coefficient distribution on the surface agrees well with the experimental data.