Stereoscopic PIV using optical flow: application to a cavity recirculation

Stereoscopic PIV using optical flow: application to a cavity recirculation Open cavity flows are a class of wall-bounded flows marked by a recirculation vortex, large velocity gradients, and internal three-dimensional (3D) features. That complex structure results in the combination of an upper shear layer, which can develop a Kelvin–Helmholtz-like instability interacting with walls, the flow injection inside the cavity, the recirculation vortex development, and, for some geometries and Reynolds numbers, a centrifugal Taylor–Görtler-like instability. In order to explore this flow, experimental measurements of the three components of velocity are addressed with stereoscopic two-dimensional particle image velocimetry (3C-2D PIV) using an optical flow algorithm. This technique is a valuable diagnostic tool for quantitative instantaneous description of 3D flows, as those dominated by vortex motion. PIV camera calibration is based on a pinhole model using a single target and camera focal length. The challenging issue is that the studied flow is wall-bounded and subject to laser reflections, which can alter the quality of particle images. A treatment of recorded frames is addressed to get the correct velocity field. PIV measurements are carried out in two orthogonal planes to catch the flow structure and vortex dynamics. Time development of Taylor–Görtler-like vortices is also confronted to the results obtained in previous studies. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Stereoscopic PIV using optical flow: application to a cavity recirculation

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2013 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-013-1579-2
Publisher site
See Article on Publisher Site

Abstract

Open cavity flows are a class of wall-bounded flows marked by a recirculation vortex, large velocity gradients, and internal three-dimensional (3D) features. That complex structure results in the combination of an upper shear layer, which can develop a Kelvin–Helmholtz-like instability interacting with walls, the flow injection inside the cavity, the recirculation vortex development, and, for some geometries and Reynolds numbers, a centrifugal Taylor–Görtler-like instability. In order to explore this flow, experimental measurements of the three components of velocity are addressed with stereoscopic two-dimensional particle image velocimetry (3C-2D PIV) using an optical flow algorithm. This technique is a valuable diagnostic tool for quantitative instantaneous description of 3D flows, as those dominated by vortex motion. PIV camera calibration is based on a pinhole model using a single target and camera focal length. The challenging issue is that the studied flow is wall-bounded and subject to laser reflections, which can alter the quality of particle images. A treatment of recorded frames is addressed to get the correct velocity field. PIV measurements are carried out in two orthogonal planes to catch the flow structure and vortex dynamics. Time development of Taylor–Görtler-like vortices is also confronted to the results obtained in previous studies.

Journal

Experiments in FluidsSpringer Journals

Published: Jul 19, 2013

References

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