普朗特历史性流动显示电影的PIV分析
PIV Analysis of Ludwig Prandtl's Historic Flow Visualization Films
摘要：
1930年前后，路德维希·普朗特和他的同事O. Tietjens和W.缪勒发表了两部影片，其中显示了表面穿透障碍物周围的流动，以说明流动分离的非定常过程。这些可视化是通过记录细颗粒喷洒到水通道中的水面上的运动来实现的。所得到的图像符合粒子图像测速（PIV）的适当播种记录的相关标准。用现代PIV算法处理这些图像序列可以使PIV技术发展之前无法获得的流量（例如涡度）可视化。附带的流体动力学视频由选定的原始电影序列与通过PIV处理获得的可视化叠加组成。
英文摘要：
Around 1930 Ludwig Prandtl and his colleagues O. Tietjens and W. Müller published two films with visualizations of flows around surface piercing obstacles to illustrate the unsteady process of flow separation. These visualizations were achieved by recording the motion of fine particles sprinkled onto the water surface in water channels. The resulting images meet the relevant criteria of properly seeded recordings for particle image velocimetry (PIV). Processing these image sequences with modern PIV algorithms allows the visualization of flow quantities (e.g. vorticity) that were unavailable prior to the development of the PIV technique. The accompanying fluid dynamics video consists of selected original film sequences overlaid with visualizations obtained through PIV processing.
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