基于六面体单元的流线可视化点定位研究

Hexahedron-Based Cell-Traversal in Streamline Visualization

流线是CFD矢量场可视化的重要技术。针对不规则结构化网格的三维定常矢量场数据,对流线可视化技术进行研究。重点针对基于六面体单元网格的数值积分方法生成流线技术中的一个难点——点定位问题,分析了影响算法精度的两个重要原因——对单元Jacobian矩阵的近似,以及网格单元几何结构与拓扑结构的不一致性。最后,提出了基于六面体单元的改进方法。

In CFD vector field visualization streamline is an important technique. Aiming at data sets of three-dimensional steady vector fields with irregular structured grids, this dissertation studies on the visualization techniques of streamline. This paper concerns mainly on the issues about cell-traversal (point location and cell searching) in streamline generation algorithm, analyzes two important factsthe approximation to Jacobian matrix and the inconsistency between geometry and topology in hexahedron cellsthat affect algorithmic precision. Hexahedron-based approaches for algorithmic improvement are presented.