Limits on the resolution of correlation PIV iterative methods. Fundamentals

• Published in: Experiments in fluids Vol. 39; no. 2; pp. 305 - 313
• Main Authors: NOGUEIRA, J, LECUONA, A, RODRIGUEZ, P. A
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Heidelberg Springer 01.08.2005; Berlin
• Subjects: Biological and medical applications; Constraining; Correlation; Distortion; Exact sciences and technology; Fluid dynamics; Fluid flow; Fluids; Fundamental areas of phenomenology (including applications); Instrumentation for fluid dynamics; Metrological applications; Optics; Physics; Spatial resolution; Weighting functions; Germany, Berlin; Germany, Baden-Wuerttemberg, Heidelberg; USA, New York; Resolving power; Algorithms; Image processing; Correlations; Measurement by laser beam; Particle image velocimetry; Flow pattern; Velocity measurement; Iterative methods; Spatial resolution
• ISSN: 0723-4864; 1432-1114
• DOI: 10.1007/s00348-005-1016-2

The spatial resolution of correlation particle image velocimetry (PIV) is a frequently addressed issue that still raises scientific interest. In conventional non-iterative PIV, the spatial resolution limits are of common knowledge (Willert and Gharib (1991) Exp Fluids 10:181-193; Raffel et al. (1998) ISBN 3-540-63683-8, Springer, Berlin Heidelberg New York, among others). On the contrary, those advanced iterative multipass methods that use image distortion techniques or multigrid techniques present a more complex scenario. One of the concepts that raises more debate is the limiting effect of the interrogation window size. This paper focuses on the subject, trying to clarify key points. The results indicate that iterative algorithms using an appropriate weighting function eliminate the window size from the ensemble of spatial resolution limits.