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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Effect of predictor-corrector filtering on the stability and spatial resolution of iterative PIV interrogation
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Effect of predictor-corrector filtering on the stability and spatial resolution of iterative PIV interrogation

机译：预测校正滤波器对迭代PIV询问的稳定性和空间分辨率的影响

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摘要

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.
机译：研究了迭代PIV图像分析方法的稳定性和分辨率。该研究着重于在迭代过程中实现时通过空间滤波的稳定效果。研究了两种滤波方法：分别是预测器滤波和校正器滤波。提出了一个卷积滤波器家族，它允许系统地改变滤波强度，并且主要影响系统的稳定性，并在较小程度上影响其空间响应。确定滤波器参数的临界值，该临界值可确保迭代过程的稳定性。提供了理论分析，该理论分析确定了具有变化滤波器参数的迭代方法的渐近性质。该研究以数值评估完成，并以实际实验为结尾，显示了在实验条件下错误实施迭代方案的结果。

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