A Vision-Based Particle Tracking Velocimetry

Baldassarre, Antonio; Lucia, Maurizio De; Nesi, Paolo; Rossi, Francesca

doi:10.1006/rtim.1999.0203

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…In contrast, the PTV method belongs to the Lagrangian method [10], calculating the velocity by measuring the length of the particle optical trajectory under an exposure time interval. This method has strong real-time performance and the operation is simple [2], but the accuracy is relatively lower compared to the PIV algorithm. The LSV method is generally applied to dense granular flow.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Velocity and Particle Size in Shock Wave Area Generated by Experimental Granular Flow Impacting on a Cylinder Based on Image Processing Methods

Wang

et al. 2023

Lecture Notes in Civil Engineering

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The measurement of flow velocity and particle size remains an important issue in granular -flow dynamics and can provide important basis to better understand the physics in granular material, particularly when it impacts on a structure. In this study, laboratory chute experiments were performed with quartz-glass particle materials to investigate the characteristics of granular shock developed upstream of a cylinder generated by granular flow impacts. A time series of flow images recorded by a camera has been analyzed and processed using the digital image processing methods such as the gray processing, the image binarization, the image corrosion and expansion, and the generative adversarial networks, with a goal of obtaining flow velocity and particle size in the granular shock area. The experimental results reveal that the granular-flow velocity grows with increasing slope angle. The granular shock thickness shows a general increase with the growing number of particles in the shock area, and the number of particles demonstrates an inversely proportional to increasing Froude number, providing a potential method for determining the particle size of dense granular flow. The findings of this study could help to better understand the shock dynamics of granular flow impacting on an obstacle.

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Section: Introductionmentioning

confidence: 99%

Measurement of Velocity and Particle Size in Shock Wave Area Generated by Experimental Granular Flow Impacting on a Cylinder Based on Image Processing Methods

Wang

et al. 2023

Lecture Notes in Civil Engineering

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“…Although recently new monitoring techniques like X-ray computer tomography (Coletta et al, 1991;Schreurs et al, 2003), particle image velocimetry (PIV, e.g. Baldassarre et al, 2001;Wolf et al, 2003;Hampel et al, 2004;Adam et al, 2005;Rosenau et al, 2009;Reiter et al, 2011), or laser scanning (e.g. Persson et al, 2004;Graveleau and Dominguez, 2008) have led to significant improvements in analysing and transfering sandbox experiments, the challenge to monitor 3-D evolution of structures within opaque bodies remains.…”

Section: Introductionmentioning

confidence: 99%

Seismic imaging of sandbox experiments – laboratory hardware setup and first reflection seismic sections

et al. 2013

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Abstract. With the study and technical development introduced here, we combine analogue sandbox simulation techniques with seismic physical modelling of sandbox models. For that purpose, we designed and developed a new miniseismic facility for laboratory use, comprising a seismic tank, a PC-driven control unit, a positioning system, and piezoelectric transducers used here for the first time in an array mode. To assess the possibilities and limits of seismic imaging of small-scale structures in sandbox models, different geometry setups were tested in the first 2-D experiments that also tested the proper functioning of the device and studied the seismo-elastic properties of the granular media used. Simple two-layer models of different materials and layer thicknesses as well as a more complex model comprising channels and shear zones were tested using different acquisition geometries and signal properties. We suggest using well sorted and well rounded grains with little surface roughness (glass beads). Source receiver-offsets less than 14 cm for imaging structures as small as 2.0-1.5 mm size have proven feasible. This is the best compromise between wide beam and high energy output, and is applicable with a consistent waveform. Resolution of the interfaces of layers of granular materials depends on the interface preparation rather than on the material itself. Flat grading of interfaces and powder coverage yields the clearest interface reflections. Finally, sandbox seismic sections provide images of high quality showing constant thickness layers as well as predefined channel structures and indications of the fault traces from shear zones. Since these were artificially introduced in our test models, they can be regarded as zones of disturbance rather than tectonic shear zones characterized by decompaction. The multiple-offset surveying introduced here, improves the quality with respect to S / N ratio and source signature even more; the maximum depth penetration in glass-bead layers thereby amounts to 5 cm. Thus, the presented mini-seismic device is already able to resolve structures within simple models of saturated porous media, so that multiple-offset seismic imaging of shallow sandbox models, that are structurally evolving, is generally feasible.

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Evolution of fault zones in carbonates with mechanical stratigraphy – Insights from scale models using layered cohesive powder

Gent

Holland

Urai

et al. 2010

Journal of Structural Geology

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A Vision-Based Particle Tracking Velocimetry

Cited by 8 publications

References 23 publications

Measurement of Velocity and Particle Size in Shock Wave Area Generated by Experimental Granular Flow Impacting on a Cylinder Based on Image Processing Methods

Measurement of Velocity and Particle Size in Shock Wave Area Generated by Experimental Granular Flow Impacting on a Cylinder Based on Image Processing Methods

Seismic imaging of sandbox experiments – laboratory hardware setup and first reflection seismic sections

Evolution of fault zones in carbonates with mechanical stratigraphy – Insights from scale models using layered cohesive powder

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