Effect of predictor-corrector filtering on the stability and spatial resolution of iterative PIV interrogation
Effect of predictor-corrector filtering on the stability and spatial resolution of iterative PIV interrogation
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DOI：
10.1007/s00348-008-0511-7
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发表时间：
2008-11-01
影响因子：
2.4
通讯作者：
Scarano, F.
中科院分区：
文献类型：
--
作者：
Schrijer, F. F. J.;Scarano, F.
研究了迭代PIV图像分析方法的稳定性和分辨率。研究的重点是稳定的影响，通过空间滤波时，实施到迭代过程中。研究了两种滤波方法：预测滤波和校正滤波。提出了一种卷积滤波器族，其允许以系统的方式改变滤波强度，并且主要影响系统稳定性，并且在较小程度上影响其空间响应。确定了一个临界值的滤波器参数，这保证了迭代过程的稳定性。理论分析提供了确定的渐近性质的迭代方法与不同的滤波器参数。该研究通过数值评估完成，并最终应用于真实的实验，显示了实验条件下迭代方案不正确实施的后果。
The stability and resolution of iterative PIV image analysis methods is investigated. The study focuses on the effects of stabilization by means of spatial filtering when implemented into the iterative process. Two filtering approaches are studied: predictor and corrector filtering respectively. A family of convolution filters is proposed, which allows to vary the filtering strength in a systematic way and primarily affects the system stability and to a smaller extent its spatial response. A critical value for the filter parameter is identified which guarantees the stability of the iterative process. A theoretical analysis is provided that determines the asymptotic properties of the iterative method with varying filter parameters. The study is completed with a numerical assessment and concludes with an application to real experiments, showing the consequence of an incorrect implementation of the iterative scheme under experimental conditions.