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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Remote measurement of river discharge using thermal particle image velocimetry (PIV) and various sources of bathymetric information
TL;DR: In this paper, the authors evaluated the potential for measuring discharge via various forms of remote sensing, primarily thermal imaging of flow velocities but also spectrally-based depth retrieval from passive optical image data.
Journal ArticleDOI
The advance ratio effect on the lift augmentations of an insect-like flapping wing in forward flight
TL;DR: In this article, the influence of an advance ratio on an insect-like flapping wing was investigated using a scaled-up robotic model and a servo-driven towing tank.
Journal ArticleDOI
Drone-Based Optical Measurements of Heterogeneous Surface Velocity Fields around Fish Passages at Hydropower Dams
Dariia Strelnikova,Gernot Paulus,Sabine Käfer,Karl-Heinrich Anders,Peter Mayr,Helmut Mader,Ulf Scherling,Rudi Schneeberger +7 more
TL;DR: This study employs large-scale particle image velocimetry (LSPIV) in seeded flow conditions to analyse images of the area near a fish passage entrance, captured with the help of a ready-to-fly consumer drone and demonstrates that LSPIV based on ensemble correlation yields velocities that are in good agreement with the reference values regarding both magnitude and flow direction.
Journal ArticleDOI
Microscopic velocity field measurements inside a regular porous medium adjacent to a low Reynolds number channel flow
Alexandros Terzis,I. Zarikos,Kilian Weishaupt,Guang Yang,Xu Chu,Rainer Helmig,Bernhard Weigand +6 more
TL;DR: In this article, the hydrodynamic interaction between a regular porous medium and an adjacent free-flow channel at low Reynolds numbers was examined experimentally, and the results showed that, from a microscopic point of view, parallel flow at the interface is not obtained due to the periodically generated U-shaped flow profile between the interface pillars.
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Ultrasound-activated ciliary bands for microrobotic systems inspired by starfish.
TL;DR: In this paper, the authors demonstrate ultrasound-activated synthetic cilia bands that mimic the natural arrangements of ciliary bands on the surface of a starfish larva to drive bulk fluid motion via acoustically actuated small-amplitude oscillations.
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.