基于流体运动分解模型的流线构造方法及在CFD中的应用

Streamline Construction and Application in CFD Based on Velocity Decomposition Model of Fluid Flow

流线的生成是流场可视化研究中的重要问题 ,也是流带、流管及流面等可视化显示方法实现的基础 .经典的流线生成方法大多过于复杂 .文中提出一种简化的流线生成方法 ,将流体质点的运动在单元网格内进行分解 ,通过判别条件判别流体质点流出的面 ,通过相邻单元之间的连接关系跟踪流线的轨迹 .结合大型泵站流道 CFD计算结果 ,对文中流线生成模型加以验证 ,其可视化效果良好 .

Streamline construction is an important part of visualization for flow fields, it presents also the basis for constructing streamribbon, streamtubes and stream surfaces. Typical algorithm of streamline construction is mostly too complicated for general users. This paper presents a simplified model of decomposing the velocity in grid cell, identifying the outflow surface of fluid flow by discriminant conditions and tracing the streamline according to connection relations of cells. Our algorithm is verified with CFD computational result of passageways for large-size pump stations, the visualization effect is fine.