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对基于伴随方程的网格自适应技术的基本原理进行了研究,构造并实现了基于流场伴随方程的非结构网格自适应探测器,利用局部加密网格的办法,建立了基于Euler方程的无粘伴随自适应能力。对于粘性流动问题,提出首先应用无粘计算和伴随自适应技术从基准网格自动生成具有较好网格分辨率的非结构自适应网格,然后采用层推进法自动生成粘性计算网格的求解策略。采用RAE2822二维翼型和ONERA-M6三维机翼对所建立的无粘伴随自适应方法进行了验证,并应用所提出的方法和策略,对第二届国际涡流试验项目(VFE-2)中的65°尖前缘三角翼大攻角涡流场进行了数值模拟。对比计算结果表明,所建立的非结构网格伴随自适应方法是可行的和有效的。
The basic principle of grid adaptive technique based on adjoint equation is studied, and the unstructured grid adaptive detector based on the flow field companion equation is constructed and implemented. By using local encrypted grid, the Euler equation based No stick with adaptive ability. For the viscous flow problem, we first propose a non-stick adaptive and self-adapting technology to automatically generate unstructured adaptive grid with good grid resolution from the reference grid, and then use the layer push method to automatically generate the viscous computing grid solution Strategy. The non-adhering adaptive method is validated by RAE2822 two-dimensional airfoil and ONERA-M6 three-dimensional airfoil. The proposed method and strategy are applied to the second International Vortex Test Project (VFE-2) The large eddy angle vortex field of 65 ° pointed leading delta wing was numerically simulated. The results of comparison show that the proposed adaptive unstructured grid approach is feasible and effective.