中文摘要：

提出一种基于关键点分类的三维矢量场流动拓扑结构抽取算法，可应用于三维曲线网格、结构化网格和分块网格中．在许多计算流体力学计算中，存在非滑移边界，这种边界上流体的速度为0．通过分析流场边界的表面摩擦场的拓扑，展示绕壁面流体的流动结构；使用图标定位关键点，可交互式地标记和显示涡核区域。并通过选择暗示螺旋流动的图标，沿着该关键点的实特征值对应的特征矢量方向积分流线来完成．测试结果清晰地展示了关键特征区域的流体流动特征．

英文摘要：

We propose a 3D vector field flow topology extraction algorithm based on critical point analysis for computational fluid dynamics （CFD） data sets. The algorithm operates on curvilinear, structured grids, including large multi-zone grids. In many CFD computations, no-slip boundary conditions are imposed on the velocity field. On these boundaries, the fluid velocity vector is zero. The algorithm analyzes this special case by examining the skin friction field. Using glyphs to locate critical points, we can interactively mark vortex cores. This is drawn by selecting glyphs that indicate spiraling flow and integrating a streamline in the direction of the eigenvector associated with the real eigenvalue. The test results show clearly the fluid flow critical features.