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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Controlling the elongational flow behavior of complex shear-thinning fluids without affecting shear viscosity
TL;DR: In this article, two acrylic thickener solutions that differ with respect to the fraction of hydrophobic co-monomers were mixed to vary the elongational relaxation time, as determined using capillary breakup elongational rheometry (CaBER), by almost two orders of magnitude without affecting shear viscosity of these solutions in a wide, processing relevant shear rate range.
Journal ArticleDOI
Laboratory and numerical study of the flow field of subaqueous block sliding on a slope
TL;DR: In this article, a Weakly-Compressible Moving Particle Semi-Implicit (WC-MPS) method was used to simulate the impulse waves and velocity profiles.
Journal ArticleDOI
Increasing LSPIV performances by exploiting the seeding distribution index at different spatial scales
TL;DR: This work proposes a method based on an average SDI time series threshold with noise filtering to enhance measurement accuracy in future studies, and proposes an empirical parameter τ, which showed relatively stable values in the different contexts where it has been applied.
Journal ArticleDOI
A spherical Leidenfrost droplet with translation and rotation
TL;DR: In this paper, a theoretical model for a spherical Leidenfrost droplet with rotational and translational motion is presented, from which the velocity, the pressure field, and the temperature profile in the vapor film underneath the mobile LeidenFrost droplets are solved.
Dissertation
Molecular and physical interactions of human sperm with female tract secretions
TL;DR: Sperm-FRT interactions involve complex molecular and physical interactions and regulatory events, and the novel perspective of mechanical aspects of sperm motility by studying fluid velocity and vorticity around motile sperm adds a new approach to the study of sperm Motility and chemotaxis.
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.