论文部分内容阅读
对结冰数值计算中的网格生成进行了深入研究,针对结冰后几何边界的复杂性及边界依赖于时间步长变化对网格生成的影响展开了分析。网格生成是结冰计算的基础,文中基于求解椭圆形偏微分方程(PDEs)生成了未结冰时翼面周围的背景网格,采用Hilgenstock源项构造方法,合理控制了结冰边界周围的网格间距和正交性。模型表面结冰后,为了提高网格生成的效率、质量及可靠性,完成复杂冰形上的网格重构,提出了椭圆形、扇形分区及网格局部重构思想,同时保持分区内的网格拓扑结构不变、流场局部更新。最后将网格模块NI-GRID集成于结冰计算软件NUAA-ICE3D中,并对二维翼型和三维机翼的网格生成与重构进行了验证。
The generation of grid in numerical calculation of icing has been studied in detail. The complexity of the geometric boundary after icing and the influence of the boundary on the generation of grid depend on the change of time step. Mesh generation is the basis of icing calculation. Based on the solution of elliptic partial differential equations (PDEs), a grid of backgrounds around the airfoil without ice formation is generated. By using the Hilgenstock source term construction method, Grid spacing and orthogonality. After the surface of the model is frozen, in order to improve the efficiency, quality and reliability of mesh generation and to complete the mesh reconstruction on the complex ice, the idea of oval, sector-shaped partition and grid partial reconstruction is put forward, The topology of the grid is unchanged and the flow field is updated locally. Finally, the grid module NI-GRID was integrated into icing calculation software NUAA-ICE3D, and the mesh generation and reconstruction of two-dimensional airfoil and three-dimensional wing were verified.