黏性边界层网格自动生成

发布时间：2018-04-28 21:05

本文选题：边界层网格 + 生长法向　；参考：《力学学报》2017年05期

【摘要】：高雷诺数黏性流动在壁面附近存在边界层,在计算模拟中自动生成可靠且有效的计算网格仍然是计算流体力学存在的瓶颈.三棱柱/四面体混合网格技术在一定程度上缓解了这个困难.然而,对于复杂外形的情况,在边界层内自动高效生成高质量的三棱柱单元仍然十分困难.常用的层推进法在凹凸区域及角点处生成的边界层网格单元质量较差,边界层网格最外层尺寸不均匀.针对这些问题,发展了一种黏性边界层网格自动生成方法,通过顶点周围边的二面角识别物面网格特征确定多生长方向,预估并调整生长高度处理相交情况.同时提出一种三维前沿尺寸调节方式,提高了边界层网格单元的正交性,保证了边界层网格与远场网格尺寸的光滑过渡.通过ONERA M6翼型以及带发动机短舱的DLR-F6翼身组合体等外形的网格生成实例及绕流数值模拟,将计算值与标准实验值进行对比,结果表明:该方法能够自动高效地生成满足数值计算需求的混合网格.
[Abstract]:There is a boundary layer near the wall for viscous flow with high Reynolds number, and it is still the bottleneck of computational fluid dynamics to generate reliable and effective computational grid automatically in the calculation simulation. The triangular prism / tetrahedron hybrid mesh technology alleviates this difficulty to a certain extent. However, in the case of complex shapes, it is still very difficult to automatically and efficiently generate high quality triangular prism elements in the boundary layer. The quality of boundary layer meshes generated in concave and convex regions and corners by the commonly used layer propulsion method is poor, and the outermost boundary layer mesh size is not uniform. In order to solve these problems, an automatic mesh generation method for viscous boundary layer is developed. The multi-growth direction is determined by the dihedral angle around the vertex, and the growth height is estimated and adjusted to deal with the intersection. At the same time, a three dimensional front dimension adjustment method is proposed, which improves the orthogonality of the boundary layer mesh element and ensures the smooth transition between the boundary layer mesh and the far field grid size. Through the mesh generation and numerical simulation of the shape of ONERA M6 airfoil and DLR-F6 wing body assembly with engine compartment, the calculated values are compared with the standard experimental values. The results show that the proposed method can automatically and efficiently generate hybrid meshes that meet the needs of numerical computation.
【作者单位】：北京大学工学院力学与工程科学系;
【基金】：国家自然科学基金(11172005) 国家重点基础研究发展计划(2010CB832701)资助项目
【分类号】：O35

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