基于OPS和拓扑交换的离心泵网格质量提高算法

Mesh quality improvement for centrifugal pump based on OPS and topological swapping

针对OPS算法本身固有的无法提高"全边界单元"质量的缺陷,提出了一种结合OPS和拓扑优化的网格质量提高算法。该方法通过判别"全边界单元"中边(或面)受到相邻单元共享的形式,采用不同的拓扑交换策略,且在拓扑交换过程中仅考虑网格的拓扑相关性,并不考虑网格的质量,保证将"全边界单元"转化为OPS算法提高其质量的其他类型边界单元。算例分析表明,本文算法相比Freitag的组合算法在消除极端二面角方面更具优势,相比OPS算法对提高离心泵边界网格及整体网格质量也具有较好的优势。

A mesh quality improvement strategy combining OPS and topological optimization was firstly putted forward to overcome the existing defect that can＇t improve bad elements with all their vertices on the boundary in OPS. According to the sharing form of edge （or face） and its adjacent element, the approach applied different topological optimization methods. The topological correlation of mesh after optimization rather than the element quality in connected region was considered. In this way, this kind of element was transformed into non-full-boundary element. Examples show that the approach shows better advantage in boundary and whole mesh quality than OPS. Numerical results show that comparing with Freitag algorithm,the proposed algorithm is more successful in eliminating poor dihedral angles at both extremes. And the combined algorithm shows better advantage on boundary and entire quality improve- ment for centrifugal pump over OPS.