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 technique of three dimensional unstructured adaptive multigrid based on the boundary of the computational domain is presented. The procedure begins with an initial coarse mesh and enriches this mesh in regions of high solution gradient. New boundary nodes are added by using an initial very fine boundary mesh to reflect the underlying surface representation of the geometry. The meshes after refining are used as multigrids, and the unstruuctured multigrid method is adopted to improve the efficient of flow solving. The transonic flow around M6 wing is simulated by solving Euler equations, and it is demonstrated that the flow shock on the wing can be captured accurately, and the pressure coefficient distribution on the surface shows a good agreement with the experimental data.
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