Iterative multigrid approach in PIV image processing with discrete window offset

The features of an improved algorithm for the interrogation of (digital) PIV pictures are described. The method, based on cross-correlation, 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 it...

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Vydané v:Experiments in fluids Ročník 26; číslo 6; s. 513 - 523
Hlavní autori: Scarano, F., Riethmuller, M. L.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Heidelberg Springer 01.05.1999
Berlin
Predmet:
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Instrumentation for fluid dynamics
Physics
Cross correlations
Measurement errors
Algorithms
Turbulent flow
Image processing
Multigrid
Refinement method
Particle image velocimetry
Velocity measurement
Iterative methods
ISSN:0723-4864, 1432-1114
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Shrnutí:The features of an improved algorithm for the interrogation of (digital) PIV pictures are described. The method, based on cross-correlation, 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. A systematic comparison is presented with direct numerical simulation data available on the subject. (Author)
Bibliografia:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0723-4864
1432-1114
DOI:10.1007/s003480050318