Based on the local topological structures of finite element meshes, this paper presents several procedures for improving the topology of unstructured quadrilateral meshes.

• 摘要基于有限元网格的局部拓扑结构，给出一些非结构化全四边形有限元网格的拓扑优化策略，这些策略被组织成“型-操作”的形式。