Vorticity fields calculated from PIV data have previously been shown to be sensitive to interrogation window overlap and differentiation scheme. To date, only qualitative comparisons have been made since a quantitative study requires knowledge of the “true” velocity. A data set consisting of several simultaneous measurements of both high fidelity and more typical PIV data is used for the present study. The uncertainty of the high fidelity data is small enough compared to the typical data to be considered “truth”. This allows a quantitative measure of correlated error due to interrogation region overlap and how it decreases with distance. Two similar differentiation schemes that are known to produce qualitatively different vorticity fields are also examined. The net effects of correlation are shown to decrease random uncertainty in most cases.

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