Iterative multigrid approach in PIV image processing with discrete window offset |
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Authors: | F Scarano M L Riethmuller |
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Institution: | (1) von Kármán Institute for Fluid Dynamics Chaussée de Waterloo, 72 B-1640 Rhode Saint Genèse, Belgium, BE |
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Abstract: | 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 analysing
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.
Received: 7 October 1997/Accepted: 11 August 1998 |
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