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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Local flame and flow properties of propagating premixed turbulent flames during light-round process in a MICCA-type annular combustor
TL;DR: In this paper, the curvature of flame front, local flame speed and the evolution of leading points during the light-round process were analyzed in detail, and the results indicated that the slight asymmetry of the propagation in two flame branches is mainly due to the competition between the local swirling injection and the overall circumferential flow along the inner or outer parts of the combustor.
Journal ArticleDOI
3D-thrust fault pattern control on negative inversion: An analogue modelling perspective on central Italy
Chiara Del Ventisette,Marco Bonini,Daniele Maestrelli,Federico Sani,Emanuele Iavarone,Domenico Montanari +5 more
TL;DR: In this article, the structural evolution of a composite, heterogeneous multilayer affected by polyphase deformation is investigated. And the experimental results provide further support to the hypothesis of a link between Quaternary normal faults and inherited thrust faults during the 2016 Central Italy seismic sequences.
Journal ArticleDOI
Mixture formation and combustion process analysis of an innovative diesel piston bowl design through the synergetic application of numerical and optical techniques
Federico Millo,Andrea Piano,Salvatore Roggio,José V. Pastor,Carlos Micó,Felipe Lewiski,Francesco Concetto Pesce,Alberto Vassallo,Andrea Bianco +8 more
TL;DR: In this paper, an innovative piston bowl for a light-duty diesel engine was designed, coupling both a sharp-stepped lip and radial bumps in the inner bowl rim, thus enabling faster combustion process after the end of main injection.
Journal ArticleDOI
Spatiotemporal Oscillation in Confined Epithelial Motion upon Fluid-to-Solid Transition.
Jing Yu,Pingqiang Cai,Xiaoqian Zhang,Tiankai Zhao,Linlin Liang,Linlin Liang,Sulin Zhang,Hong Liu,Xiaodong Chen +8 more
TL;DR: In this article, the Madin-Darby canine kidney (MDCK) monolayers undergo spatiotemporally oscillatory motions that are strongly dependent on the confinement size and distance from the periphery of the monlayers.
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The development of helical vortex pairs in oscillatory flows – A numerical and experimental study
TL;DR: In this paper, it was demonstrated that a significant swirling velocity was generated by the helical coils, inducing an outward centrifugal force and inward pressure gradient, creating an instability resulting in the formation of a pair of counter-rotating vortices.
References
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Journal ArticleDOI
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.