Test and comparison of various methods of analysis and post-processing on a Database of PIV records

Abstract

As was indicated in the introduction of the previous chapter, advantage can be taken of the fact that PIV is a two step method to characterize the recording and analysis procedures separately. As was also illustrated in chapter 2, there are many different ways to record PIV images and these images may be quite different from each other, depending on many different parameters of the recording set-up (seeding size, concentration and homogeneity,.optical properties of the flow, windows and lenses, characteristics of the recording medium...). Three kinds of records (photographic, video and holographic) and several analysis methods (optical, digital, optical-digital, auto correlation, cross correlation, direct analysis, Fourier analysis...) were in use, during the course of the program, for PIV measurements. Each laboratory cannot afford to buy or develop each of them. One major objective of EUROPIV was to provide a selection of PIV records obtained in different flow situations, representative of the problems to tackle with this method (different image quality, particle concentration, out of plane velocity component, turbulence intensity, vortex intensity...), and compare the results of the analysis of these records by the different methods developed by the different teams.KeywordsCross CorrelationParticle Image VelocimetryParticle ImageInterrogation WindowReference VectorThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.