【摘要】 降落伞稳态流体动力学(ComputationalFluidDynamics,CFD)计算的网格生成是一个带边界层的三维复杂域网格生成问题,目前用于边界层计算的混合网格生成方法,往往存在计算繁琐、应用范围窄、自动化差、以及难以适应复杂外形的缺点。文章提出了一种结合约束德洛内(Delaunay)网格生成和网格前沿推进技术的降落伞稳态CFD计算的流场网格生成方法,实现了降落伞网格和包括边界层区域在内的流场网格一体化、全自动、高品质的生成。该方法采用网格前沿推进法来生成边界层区域的网格节点;算法整体上采用三维约束Delaunay网格生成技术,边界层层节点集合在网格生成过程中作为约束Delaunay三角化的约束条件,避免了复杂的网格求交计算和拓扑处理。网格生成实例表明,该方法能全自动生成降落伞稳态CFD网格,生成的网格品质、网格规模等满足降落伞稳态CFD计算的需求,同时该方法具有一定的通用性。更多还原

【Abstract】 The mesh generation of parachute steady-state CFD computation is a three-dimensional complicated domain mesh generation problem with boundary layers. At present, the hybrid mesh generation method for boundary layer computation often has the disadvantages of cumbersome calculation, narrow application scope, poor automation and difficult to adapt to complicated domain shape. This paper presents a flow field grid generation method for parachute steady-state CFD calculation based on constrained Delaunay mesh generation and advancing-front technology, which achieves full automatic and high quality mesh generation of parachute and flow field mesh including boundary layer region. In this method, mesh nodes in the boundary layer region are generated by the advancing-front method, and the three-dimensional constrained Delaunay mesh generation technology is adopted as a whole. The node set in the boundary layer region created by the advancing-front method is used as the constrained condition of the constrained Delaunay triangulation in the process of mesh generation, thus avoiding the complicated mesh intersection calculation and topological processing. Mesh generation examples show that the method can automatically generate parachute steady-state CFD meshes. The quality of the generated mesh and the number of the its elements meet the requirements of parachute steady-state CFD calculation. At the same time, the method has certain generality.更多还原