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TECHNICAL PAPERS

A PIV Algorithm for Estimating Time-Averaged Velocity Fields

[+] Author and Article Information
Carl D. Meinhart

Department of Mechanical & Environmental Engineering, University of California, Santa Barbara, CA 93106e-mail: meinhart@engineering.vcsb.edu

Steve T. Wereley

Mechanical Engineering, Purdue University, 1288 Mechanical Engineering Building, West Lafayette, IN 47909-1288

Juan G. Santiago

Department of Mechanical Engineering, Stanford University, Stanford, CA 94305-3030

J. Fluids Eng 122(2), 285-289 (Feb 02, 2000) (5 pages) doi:10.1115/1.483256 History: Received May 17, 1999; Revised February 02, 2000
Copyright © 2000 by ASME
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References

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Meinhart, C. D., Barnhart, D. H., and Adrian, R. J., 1994, “Interrogation and validation of three-dimensional vector fields,” Developments in Laser Techniques and Applications to Fluid Mechanics, R. J. Adrian et al., eds., Springer-Verlag, Berlin, pp. 379–391.
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Figures

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Diagrams depicting the different ways in which the average velocity can be estimated: (a) average velocity method, (b) average image method, (c) average correlation method
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Instantaneous cross correlation functions that are averaged together to produce an average correlation function. The average correlation function has a much higher signal-to-noise ratio than the instantaneous correlation functions.
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Velocity vector fields showing the results from the different methods of calculation: (a) instantaneous velocity field, (b) time average of twenty instantaneous velocity fields, (c) velocity field calculated from time-averaged correlation functions
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Comparison of the performance of the three averaging techniques: average velocity •, average image ▪, and average correlation ▾

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