降落伞网格剖分技术研究

Research on Mesh Generation Technique of Parachute

降落伞几何建模和网格剖分是降落伞流固耦合数值仿真的基础。文章建立了包括伞衣主体、径向带、伞顶孔和底边加强带的降落伞精细几何模型,并基于软件开发平台VS2010使用C++语言设计并实现了针对该几何模型的网格自动剖分器。该剖分器采用约束Delaunay剖分算法,具有良好的理论基础、生成的网格质量(quality)高,满足降落伞数值仿真对网格质量的要求;并提供接口可将顶点和网格信息导入到商用软件中做进一步求解分析。实验证明,使用文中网格剖分器生成的网格,不但网格单元质量优于使用商用软件生成的网格,而且在网格单元质量相似的情况下,网格单元数量相对较少。同时,该网格在数值仿真中表现良好。

Geometry modeling and meshing of parachute are the basis of the fluid-solid coupling numerical simulation of parachute. In this paper, the refined geometry model of parachute, including the body of canopy, radial belts, umbrella top and bottom reinforcing belts, is established, and based on software VS2010, an automatic mesh generator for this geometric model is designed and implemented, which uses C＋＋. The generator uses constrained Delaunay algorithm, which has a good theoretical foundation and can generate high quality meshes, to meet the requirements of parachute numerical simulation. And the interface is provided to import the information of vertex and mesh into the commercial software for further simulation and analysis. Experiments show that the quality of meshes generated by this generator is superior to the quality of meshes generated by common commercial software, and the number of meshes is relatively less under similar quality of meshes. In addition the meshes behave well in numerical simulation.