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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Cell density and actomyosin contractility control the organization of migrating collectives within an epithelium
TL;DR: Computational models predict the regulation of collective migration in an in vivo epithelium and demonstrate how commonly altered cellular properties can prime groups of cells to adopt migration patterns that may be harnessed in health or exploited in disease.
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Direct measurement of selective evaporation of binary mixture droplets by dissolving materials
Hyoungsoo Kim,Howard A. Stone +1 more
TL;DR: In this article, the authors investigate experimentally and theoretically how a droplet of a binary mixture evaporates when placed on a solid substrate and show that a mixture consisting of an organic solvent and deionized water dissolves suspended fluorescent polystyrene particles if the lower volatility organic solvent reaches a critical concentration.
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Bouncing oil droplet in a stratified liquid and its sudden death
Yanshen Li,Christian Diddens,Christian Diddens,Andrea Prosperetti,Andrea Prosperetti,Kai Leong Chong,Xuehua Zhang,Xuehua Zhang,Detlef Lohse,Detlef Lohse +9 more
TL;DR: The experimental and numerical study of a self-propelling oil droplet in a vertically stratified ethanol-water mixture shows a type of prominent droplet bouncing inside a continuous medium with no wall or sharp interface.
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Resolving two-dimensional flow structure in rivers using large-scale particle image velocimetry: An example from a stream confluence
Quinn W. Lewis,Bruce L. Rhoads +1 more
TL;DR: In this paper, a high-resolution action camera mounted above a stream confluence and water seeded with recycled landscape mulch is used to measure surface velocities at high spatial and temporal resolution.
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Optical-flow-based background-oriented schlieren technique for measuring a laser-induced underwater shock wave
TL;DR: In this article, the background-oriented schlieren (BOS) technique with the physics-based optical flow method (OF-BOS), is developed for measuring the pressure field of a laser-induced underwater shock wave.
References
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The Design and Implementation of FFTW3
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.