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Title of Journal: Exp Fluids

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Abbravation: Experiments in Fluids

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Springer-Verlag

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DOI

10.1007/978-94-017-7540-3_3

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1432-1114

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A novel architecture for a superresolution PIV al

Authors: A Susset J M Most D Honoré
Publish Date: 2005/10/05
Volume: 40, Issue: 1, Pages: 70-79
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Abstract

Three different particle image processing algorithms have been developed for the improvement of PIV velocity measurements characterized by large velocity gradients The objectives of this study are to point out the limitations of the standard processing methods and to propose a complete algorithm to enhance the measurement accuracy The heart of the PIV image processing is a direct crosscorrelation calculation in order to obtain complete flexibility in the choice of the size and the shape of the interrogation window IW An iterative procedure is then applied for the reduction of the size of IW at each measurement location This procedure allows taking into account the local particle concentration in the image The results of this first iterative processing applied to synthetic images show both a significant improvement of measurement accuracy and an increase of the spatial resolution Finally a superresolution algorithm is developed to further increase the spatial resolution of the measurement by determining the displacement of each particle The computer time for a complete image processing is optimized by the introduction of original data storage in Binary Space Partitions trees It is shown that measurement errors for large velocity gradient flows are similar to those obtained in simpler cases with uniform translation displacements This last result validates the ability of the developed superresolution algorithm for the aerodynamic characterization of large velocity gradient flows


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  1. Passive mixing control of plane parallel jets
  2. Planar fluorescence for round bubble imaging and its application for the study of an axisymmetric two-phase jet
  3. Imaging diffusion in a microfluidic device by third harmonic microscopy
  4. Two- and three-dimensional flows in nearly rectangular cavities driven by collinear motion of two facing walls
  5. Vortex dynamics and mass entrainment in turbulent lobed jets with and without lobe deflection angles
  6. Using stereo multigrid DPIV (SMDPIV) measurements to investigate the vortical skeleton behind a finite-span flapping wing
  7. Influence of a wavy boundary on turbulence.
  8. A novel data reduction technique for single slanted hot-wire measurements used to study incompressible compressor tip leakage flows
  9. Digital holography for micro-droplet diagnostics
  10. Kriging regression of PIV data using a local error estimate
  11. Active control of an axisymmetric jet with distributed electromagnetic flap actuators
  12. Experimental investigations on steady wake effects in a high-lift turbine cascade
  13. Simultaneous droplet and vapour-phase measurements in an evaporative spray by combined ILIDS and PLIF techniques
  14. Simultaneous droplet and vapour-phase measurements in an evaporative spray by combined ILIDS and PLIF techniques
  15. Experimental study of liquid–vapor phase distribution in a single tube capillary evaporator
  16. Analysis of the impact of impeller geometry on the turbulent statistics inside a fan-stirred, cylindrical flame speed vessel using PIV
  17. Detection of microorganismic flows by linear and nonlinear optical methods and automatic correction of erroneous images artefacts and moving boundaries in image generating methods by a neuronumerical hybrid implementing the Taylor’s hypothesis as a priori knowledge
  18. Hot-wire spatial resolution effects in measurements of grid-generated turbulence
  19. Effect of experimental parameters and image noise on the error levels in simultaneous velocity and temperature measurements using molecular tagging velocimetry/thermometry (MTV/T)
  20. Turbulence measurements in pipe flow using a nano-scale thermal anemometry probe
  21. The pinch-off process in a starting buoyant plume
  22. Defining the roughness sublayer and its turbulence statistics
  23. Evolution of a forced counter rotating vortex pair for two selected forcing frequencies
  24. Optically efficient fluorescent tracers for multi-constituent PIV
  25. Intermittent corner separation in a linear compressor cascade
  26. Measurement of the turbulent kinetic energy budget of a planar wake flow in pressure gradients
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  28. High-speed roll coating with complex rheology fluids
  29. Wing–vortex interaction: unraveling the flowfield of a hovering rotor
  30. Near-surface velocimetry using evanescent wave illumination
  31. Designing a maximum precision interferometric particle imaging set-up
  32. Characterizing the lower log region of the atmospheric surface layer via large-scale particle tracking velocimetry
  33. Development and characterization of high-frequency resonance-enhanced microjet actuators for control of high-speed jets
  34. PIV measurement of internal flow characteristics of very low specific speed semi-open impeller
  35. A new method for measuring turbulent heat fluxes using PIV and fast-response cold-wires
  36. Reynolds number dependence of the inertial range scaling of energy dissipation rate and enstrophy in a cylinder wake
  37. Velocity measurements in the oscillatory boundary layer produced by acoustic waves
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  41. Polymer-induced turbulence modifications in an impinging jet
  42. Quantitative detection of turbulent reattachment using a surface mounted hot-film array

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