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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Iterative multigrid approach in PIV image processing with discrete window offset
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Iterative multigrid approach in PIV image processing with discrete window offset

机译：离散窗口偏移的PIV图像处理中的迭代多网格方法

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摘要

The features of an improved algorithm for the interrogation of (digital) particle image velocimetry (PIV) pictures are described. The method is based on cross-correlation. It makes use of a translation of the interrogation areas. Such a displacement is predicted and corrected by means of an iterative procedure. In addition, while iterating, the method allows a refinement of the size of the interrogation areas. The quality of the measured vectors is controlled with data validation criteria applied at each intermediate step of the iteration process. A brief section explains the expected improvements in terms of dynamic range and resolution. The accuracy is assessed analyzing images with imposed displacement fields. The improved cross-correlation algorithm has been applied to the measurement of the turbulent flow past a backward facing step (BFS). A systematic comparison is presented with Direct Numerical Simulation (DNS) data available on the subject.
机译：描述了用于询问（数字）粒子图像测速（PIV）图像的改进算法的功能。该方法基于互相关。它利用了询问区域的翻译。借助于迭代过程来预测和校正这种位移。另外，在迭代时，该方法允许细化询问区域的大小。通过在迭代过程的每个中间步骤中应用的数据验证标准来控制所测量矢量的质量。简短的部分说明了动态范围和分辨率方面的预期改进。通过分析具有强制位移场的图像来评估准确性。改进的互相关算法已应用于流经后向台阶（BFS）的湍流测量。系统提供了与该主题上可用的直接数值模拟（DNS）数据进行的系统比较。

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