PIVlab – Towards User-friendly, Affordable and Accurate Digital Particle Image Velocimetry in MATLAB
William Thielicke,Eize Stamhuis +1 more
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TLDR
The accuracy of several algorithms was determined and the best performing methods were implemented in a user-friendly open-source tool for performing DPIV flow analysis in Matlab.Abstract:
Digital particle image velocimetry (DPIV) is a non-intrusive analysis technique that is very popular for mapping flows quantitatively. To get accurate results, in particular in complex flow fields, a number of challenges have to be faced and solved: The quality of the flow measurements is affected by computational details such as image pre-conditioning, sub-pixel peak estimators, data validation procedures, interpolation algorithms and smoothing methods. The accuracy of several algorithms was determined and the best performing methods were implemented in a user-friendly open-source tool for performing DPIV flow analysis in Matlab.read more
Citations
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Flow velocity and discharge measurement in rivers using terrestrial and UAV imagery
TL;DR: In this paper, an automatic workflow to measure surface flow velocities in rivers is introduced, including a Python tool, based on PTV and comprises an automatic definition of the search area for particles to track.
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Influence of entrance geometry on flow field and heat transfer performance in stationary two-pass smooth parallelogram channels
TL;DR: In this paper, the effects of entrance geometry and Reynolds number (Re) on the detailed flow fields and local temperature distributions in a stationary two-pass smooth parallelogram channel with 180-deg sharp turn were investigated.
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Pushbroom Hyperspectral Data Orientation by Combining Feature-Based and Area-Based Co-Registration Techniques
TL;DR: This work equips an aircraft with both a frame camera and a pushbroom scanner with a bundle adjustment algorithm, and applies this algorithm to five test acquisitions over Lake Geneva region (Switzerland) and Lake Baikal region (Russia).
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Flow behavior of skewed vortex generators on a backward-facing ramp:
TL;DR: In this paper, the impact of skewness angle on the effectiveness of vortex generators and the behavior of streamwise vortices on flow separation behind a backward-facing ramp (BFR) with a sharp transition w...
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A comparison of tools and techniques for stabilising unmanned aerial system (UAS) imagery for surface flow observations
Robert Ljubičić,Dariia Strelnikova,Matthew T. Perks,Anette Eltner,Salvador Peña-Haro,Alonso Pizarro,Silvano Fortunato Dal Sasso,Ulf Scherling,Pietro Vuono,Salvatore Manfreda +9 more
TL;DR: This paper does not intend to identify the optimal stabilisation tool for UAS-based velocimetry purposes, but does aim to shed light on details of implementation, which can help engineers and researchers choose the tool suitable for their needs and specific field conditions.
References
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Matteo Frigo,Steven G. Johnson +1 more
TL;DR: It is shown that such an approach can yield an implementation of the discrete Fourier transform that is competitive with hand-optimized libraries, and the software structure that makes the current FFTW3 version flexible and adaptive is described.
Book
Particle Image Velocimetry: A Practical Guide
TL;DR: In this paper, the authors present a practical guide for the planning, performance and understanding of experiments employing the PIV technique, which is primarily intended for engineers, scientists and students, who already have some basic knowledge of fluid mechanics and nonintrusive optical measurement techniques.
Journal ArticleDOI
Particle-Imaging Techniques for Experimental Fluid Mechanics
TL;DR: A review of these methods can be found in articles by Lauterborn & Vogel (1984), Adrian (1986a), Hesselink (1988), and Dudderar et al..
Journal ArticleDOI
Adaptive histogram equalization and its variations
Stephen M. Pizer,Stephen M. Pizer,E. Philip Amburn,E. Philip Amburn,John D. Austin,Robert Cromartie,Ari Geselowitz,Ari Geselowitz,Trey Greer,Bart M. ter Haar Romeny,John B. Zimmerman,John B. Zimmerman +11 more
TL;DR: It is concluded that clipped ahe should become a method of choice in medical imaging and probably also in other areas of digital imaging, and that clip ahe can be made adequately fast to be routinely applied in the normal display sequence.
Journal ArticleDOI
Digital Particle Image Velocimetry
Christian Willert,Morteza Gharib +1 more
TL;DR: In this article, the directional ambiguity associated with PIV and LSV is resolved by implementing local spatial cross-correlations between two sequential single-exposed particle images, and the recovered velocity data are used to compute the spatial and temporal vorticity distribution and the circulation of the vortex ring.