一种改进的基于参数变换的表面网格生成方法  

An Improved Surface Grid Generation Method Based on Parameter Space Mapping

作　　者：李广宁[1] 李凤蔚[1] 周志宏[1] 鄂秦[1] 

机构地区：[1]西北工业大学航空学院,陕西西安710072

出　　处：《西北工业大学学报》2008年第1期6-10,共5页Journal of Northwestern Polytechnical University

摘　　要：针对Samareh-Abolhassani和Stewart提出的基于参数空间投影变换的表面网格生成技术,提出了一种均匀参数空间变换(UPS)与弧长参数空间变换(APS)相结合的改进的表面网格生成方法,称之为UAS变换,并在这种表面网格生成过程中,提出了一种新的网格面元搜索方法。从而提高了这种参数空间投影变换的表面网格生成技术的鲁棒性和有效性。The method of CFD surfaee grid generation based on parameter spaee mapping proposed by Samareh-Abolhassan and Stewart is modified here, and an improved method called uniform/are-length parameter space （UAS） mapping is presented. With the present method, a smoothing factor is imported to combine the uniform parameter space mapping and are-length parameter space mapping and avoid the grid oscillation in the process of surface grid generation from a complex configuration, for example, the total are-length between two adjacent lines of the background grids differs significantly from each other or a pole exists on the background surface. A new grid patch searching method based on cell＇s area is developed in the procedure of backward mapping. The numerical tests show that the parameterization With the new method is incorporated into the characteristics of the CAD surface geometry as much as possible, and the resulted CFD surface grid has retained much more information from the background CAD grid to improve the grid smoothness than the original formula, and our method is more robust and more efficient. A code called SURGRD based on this method is programmed.

关 键 词：参数空间 表面网格 UPS变换 APS变换 

分 类 号：V211.4[航空宇航科学与技术—航空宇航推进理论与工程]