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Experiments in Fluids
Published in: Experiments in Fluids 1/2009

01-07-2009 | Research Article

Spatially correlated precision error in digital particle image velocimetry measurements of turbulent flows

Authors: Z. R. Carr, K. A. Ahmed, D. J. Forliti

Published in: Experiments in Fluids | Issue 1/2009

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Abstract

The purpose of the current paper is to describe an experimental study of the spatially correlated precision errors associated with particle image velocimetry (PIV) measurements made in turbulent flows. A free jet was used as the base flow for the study. The precision error of time-averaged statistics of the mean and turbulent flowfield is governed by the probability distribution function of the various quantities and the finite sample size of the data sets. Spatial measurements that are separated by a distance that is shorter than the size of the large turbulent scales will not be independent, resulting in a correlated precision error. The characteristics of the precision error for various statistics will be described. It is found that mean vorticity has a correlated precision error that is limited to a much smaller length scale. The results demonstrate the importance of understanding the role of error correlation in the interpretation of PIV data.
previous article Comparison of light transmission and reflection techniques to determine concentrations in flow tank experiments
next article An experimental study of unsteady natural convection in a reservoir model subject to periodic thermal forcing using combined PIV and PIT techniques

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Literature
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Metadata
Title
Spatially correlated precision error in digital particle image velocimetry measurements of turbulent flows
Authors
Z. R. Carr
K. A. Ahmed
D. J. Forliti
Publication date
01-07-2009
Publisher
Springer-Verlag
Published in
Experiments in Fluids / Issue 1/2009
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-009-0638-1

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