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3 results on '"synchronized PIV"'

1. Advances in Hydraulics and Hydroinformatics Volume 2.

Author

Zhou, Jianguo, Borthwick, Alistair, Peng, Yong, Zhang, Jianmin, and Zhou, Jianguo

Subjects
History of engineering & technology, 3D confined wall jet, BSTEM model, Bathy-supp, CFD, CFD-DEM coupling, DEM, FGP (flaring gate pier), Froude number, Gaussian distribution, HEC-RAS controller, LES-VOF method, Ningxia-Inner Mongolia, PIV, Sichuan province, TOPSIS method, Tarim Basin, U-shaped channel, Y-shaped confluence channel, Yellow River, abutment, aerated flow, air bubble chord length, air bubble frequency, air concentration, application depth, artificial ventilation, automation of flow modeling, backward-facing step, best depth, breaking wave, bridge piers, bridge scour, cavitation bubble, central angle of step, chute aerator, clogging, coherent vortex structure, collapse near a wall, collision in air, consistent particle method, dam-break flood, decay rate, desert-oasis areas, discharge coefficient, double cavitation bubble, drag force, drip irrigation, dry season, embankment weir, energy conversion rate, energy dissipation, evolution of precipitation, experiment, experimental model, experimental study, finite crest length weir, flood &amp, floods, flow division, flow property, flow region, flow-induced vibration, fluctuating pressure, flushing, fluvial acoustic tomography, free shear layer, free surface flow, free surface measurement, gate-opening modes, gravity wave model, high-speed photography, hydraulic characteristics, hydraulic jump, hydrocyclone, hydrodynamic modelling, hydrodynamic performance, hyporheic exchange, image processing technology, impact pressure, influencing factors, information entropy theory, jet trajectory, k-ε model, large eddy simulation, lattice Boltzmann method, linearly moved irrigation system, longitudinal velocity, mean flow, micro-jet, model simulation, moving speed, multi-horizontal-submerged jets, multiple bubble collapse, near-field vibration, non-submerged rigid vegetation, numerical analysis, numerical simulation, offset jet, open channel bend, optical motion capturing, orthogonal tests, overtopping flow, parallel cavitation, particle image velocimetry, particle shape, particle size, particle size distribution, phase difference, physical hydraulic modeling, plane gate, plunge pool, pool weir, pooled stepped spillway, potential core, pressure flow, pressure wave energy, pseudopotential lattice Boltzmann model, python scripting, radius-to-width ratio, rainfall intensity distribution, river bathymetry, river flow modeling, riverbank collapse, scour and velocity field, secondary flow, sediment, sediment transport, sediment transport simulation, sediments, sensitivity analysis, separation and reattachment, shallow lake, ski-jump flow, slope coefficient, sloshing, solitary wave, spillway bottom, spillway outlet, stepped dropshaft, stilling basin with shallow-water cushion (SBSWC), subcritical flow, submerged breakwater, submerged flow, submerged jets, surface-piercing propeller, surface−groundwater flow process, synchronized PIV, tank test, three-dimensional aerator, tidal channel junction, tidal discharge, tilt distribution cavitation, trajectory line, transforming mechanism, trapezoidal cross-section, turbulence, turbulent kinetic energy, two water jets, uniformity coefficient, velocity distribution, vortex, vortical evolution, water and sediment separation, water-saving irrigation development level, wave gauge, wavelet analysis, wetland
Abstract

Summary: This Special Issue reports on recent research trends in hydraulics, hydrodynamics, and hydroinformatics, and their novel applications in practical engineering. The Issue covers a wide range of topics, including open channel flows, sediment transport dynamics, two-phase flows, flow-induced vibration and water quality. The collected papers provide insight into new developments in physical, mathematical, and numerical modelling of important problems in hydraulics and hydroinformatics, and include demonstrations of the application of such models in water resources engineering.

2. Experimental Investigation of Coherent Vortex Structures in a Backward-Facing Step Flow

Author

Dai Jiangyu, Qian Liao, Gao Ang, Wang Fangfang, Shiqiang Wu, and Senlin Zhu

Subjects
Critical distance, Geography, Planning and Development, Flow (psychology), 0207 environmental engineering, Geometry, vortical evolution, 02 engineering and technology, Aquatic Science, 01 natural sciences, Biochemistry, 010305 fluids & plasmas, free shear layer, symbols.namesake, 0103 physical sciences, Shear stress, 020701 environmental engineering, Water Science and Technology, Physics, Turbulence, backward-facing step, Reynolds number, separation and reattachment, Vortex, synchronized PIV, Shear (sheet metal), Particle image velocimetry, coherent vortex structure, symbols
Abstract

Coherent vortex structures (CVS) are discovered for more than half a century, and they are believed to play a significant role in turbulence especially for separated flows. An experimental study is conducted for a pressured backward-facing step flow with Reynolds number (Reh) being 4400 and 9000. A synchronized particle image velocimetry (PIV) system is developed for measurement of a wider range of velocity fields with high resolution. The CVS are proved to exist in the separation-reattachment process. For their temporal evolution, a life cycle is proposed that vortices form in the free shear layer, develop with pairings and divisions and finally shed at the reattachment zone, and sometimes new vortical structures are restructured with recovery of flow pattern. The CVS favor the free shear layer with frequent pairings and divisions particularly at the developing stage around x/h = 2~5 (x: distance from the step in flow direction, h: step height), which may contribute to the high turbulent intensity and shear stress there. A critical distance is believed to exist among CVS, which affects their amalgamation (pairing) and division events. Statistics show that the CVS are well organized in spatial distribution and show specific local features with the flow structures distinguished. The streamwise and vertical diameters (Dx and Dy) and width to height ratio (Dx/Dy) all obey to the lognormal distribution. With increase of Reh from 4400 to 9000, Dx decreases and Dy increases, but the mean diameter (D=0.5 × (Dx + Dy)) keeps around (0.28~0.29) h. As the increase of Reh, the vortical shape change toward a uniform condition, which may be contributed by enhancement of the shear intensity.

Published
2019

3. Experimental Investigation of Coherent Vortex Structures in a Backward-Facing Step Flow.

Author

Wang, Fangfang, Gao, Ang, Wu, Shiqiang, Zhu, Senlin, Dai, Jiangyu, and Liao, Qian

Subjects
PARTICLE image velocimetry, VORTEX shedding, LOGNORMAL distribution, REYNOLDS number, SHEARING force, FLOW separation
Abstract

Coherent vortex structures (CVS) are discovered for more than half a century, and they are believed to play a significant role in turbulence especially for separated flows. An experimental study is conducted for a pressured backward-facing step flow with Reynolds number (Reh) being 4400 and 9000. A synchronized particle image velocimetry (PIV) system is developed for measurement of a wider range of velocity fields with high resolution. The CVS are proved to exist in the separation-reattachment process. For their temporal evolution, a life cycle is proposed that vortices form in the free shear layer, develop with pairings and divisions and finally shed at the reattachment zone, and sometimes new vortical structures are restructured with recovery of flow pattern. The CVS favor the free shear layer with frequent pairings and divisions particularly at the developing stage around x/h = 2~5 (x: distance from the step in flow direction, h: step height), which may contribute to the high turbulent intensity and shear stress there. A critical distance is believed to exist among CVS, which affects their amalgamation (pairing) and division events. Statistics show that the CVS are well organized in spatial distribution and show specific local features with the flow structures distinguished. The streamwise and vertical diameters (Dx and Dy) and width to height ratio (Dx/Dy) all obey to the lognormal distribution. With increase of Reh from 4400 to 9000, Dx decreases and Dy increases, but the mean diameter (D=0.5 × (Dx + Dy)) keeps around (0.28~0.29) h. As the increase of Reh, the vortical shape change toward a uniform condition, which may be contributed by enhancement of the shear intensity. [ABSTRACT FROM AUTHOR]

Published
2019
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