基于层推进法的混合网格生成算法研究

Research on Methods of Generating Hybrid Grid Based on Advancing Layer Method

对于复杂几何外形的离心泵,在层推进法生成混合三棱柱/四面体网格时,很难生成高质量的贴体三棱柱网格,且层推进法生成三棱柱时可能违背流形的可视化条件,针对这一问题,在层推进法的基础上,采用一种新的层推进矢量计算方法生成三棱柱网格,并对影响整体网格质量的棱柱层数及棱柱层之间的比例系数进行研究,同时与已有算法生成的网格的进行对比,结果表明,三棱柱层数越少,网格质量越高;比例系数越小,网格质量越高,但比例系数减小会使网格数增加,因此,基于计算精度和计算效率考虑,推荐层数为3,比例系数为1。通过对比不同算法生成的混合网格结果表明,算法生成的网格有着更好的正交性,网格质量更高。

In general ,it＇s hard to generate high-quality prismatic grid for centrifugal pumps with complex geometrical shape when considering hybrid prismatic/tetrahedral grid .And the primary criterion may be not be satisfying for that when marching the new node should be visible from all the faces on the manifold .According to this problem ,based on advancing layer method ,a new way to calculate marching vectors is used to generate prismatic grid in this paper .And the factor that affects quality of grid like prim layer number and height ratio is studied .The impeller and volute are meshed with the algorithm in this paper and the existing algorithm . The results show that the quality is higher when the layer number is less ;Considering the calculation accuracy and efficiency ,the recommended values of the prim layer and the height ratio are 3 and 1 respectively .And the quality and calculation accuracy of hybrid grid with a new way of calculating marching vectors is higher than in a traditional way .