Experiments in Fluids

, Volume 52, Issue 3, pp 617–631 | Cite as

Optimisation of temporal averaging processes in PIV

  • Chaminda R. Samarage
  • Josie Carberry
  • Kerry Hourigan
  • Andreas Fouras
Research Article

Abstract

A hybrid of correlation and vector averaging is introduced to capitalise on the advantages of each process. An extensive series of Monte Carlo simulations have been conducted to investigate hybrid averaging and evaluate it against both vector and correlation averaging. The simulations show that hybrid averaging improves the measurement accuracy over both correlation and vector averaging over a wide range of imaging conditions. The simulations are validated by applying hybrid averaging to experimental micro- and macro-flows. In pulsatile conditions, correlation averaging yields an averaged correlation function that is multi-modal, which can result in unpredictable measurements. A Monte Carlo simulation shows the benefits of hybrid averaging over correlation averaging in such conditions. This has been experimentally validated on the unsteady wake behind a shedding circular cylinder at Re = 98.

List of symbols

Roman

En

Image signal-to-noise ratio

M

Total number of image pairs within an image series

N

Number of image pairs in a correlation average

ppw

Particles per sampling window

Q

Number of image pairs in a vector average

r

Vector validation threshold

SNR

Signal-to-noise ratio

U

Magnitude of the velocity components, u and v

W

Sampling window size

V

Volumetric flow rate

Greek

ρ1

Average number of particle image pairs in a sampling window

ρeffective

Apparent number of particle image pairs

σPIV

Standard deviation of the vector error in pixels

μPIV

Mean of the vector error in pixels

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Chaminda R. Samarage
    • 1
  • Josie Carberry
    • 2
  • Kerry Hourigan
    • 4
  • Andreas Fouras
    • 3
  1. 1.Division of Biological Engineering, Department of Mechanical & Aerospace EngineeringMonash UniversityMelbourneAustralia
  2. 2.Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical & Aerospace EngineeringMonash UniversityMelbourneAustralia
  3. 3.Division of Biological EngineeringMonash UniversityMelbourneAustralia
  4. 4.Division of Biological Engineering, Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical & Aerospace EngineeringMonash UniversityMelbourneAustralia

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