基于CAD几何模型的曲面流线可视分析方法

A visual analysis method of curved surface streamline based on CAD geometric model

针对在大规模矢量场中复杂几何曲面流线生成难的问题,设计实现了一种高精度的复杂曲面流线可视分析方法。首先,基于拓扑二维曲面结构进行求交计算,并引入高精度插值算法实现几何曲面矢量场并行抽取操作;然后,采用改进型龙格-库塔矢量场流线积分扩展技术进行积分计算,并引入自适应积分步长策略和流线-曲面求交加速结构,生成连续一致的曲面流线;最后,引入小球特征到可视化管线流程中,并集成于通用可视分析平台。实验结果表明,该方法能够高精度地生成连续一致的几何曲面流线,有效刻画复杂装置表面流场物理特性。

To address the generation problem of surface streamline on complex geometry in large-scale vector field,we design and implement a high-precision visual analysis method of complex geometric surface streamline.This method first performs the intersection calculation based on the complex topological two-dimensional surface structure,and introduces a high-precision interpolation algorithm to achieve effective vector extraction of the geometric surface.Then,an improved Runge-Kutta streamline integration extension technology for vector field is applied for integration calculation,where the adaptive integration step strategy and streamline-surface intersection acceleration structure is introduced,in order to generate continuous and consistent surface streamline.Finally,this method adds the ball feature to the visualization pipeline process,and is integrated into the general visualization analysis platform.Experimental results show that the method can generate continuous and consistent geometric surface streamlines with high precision,and effectively characterize the physical characteristics of the surface flow field of complex devices.