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4 results on '"central angle of step"'

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. Three-Dimensional Turbulence Numerical Simulation of Flow in a Stepped Dropshaft

Author

Yongfei Qi, Yurong Wang, and Jianmin Zhang

Subjects
stepped dropshaft, numerical simulation, flow region, central angle of step, Hydraulic engineering, TC1-978, Water supply for domestic and industrial purposes, TD201-500
Abstract

The dropshaft structure is usually applied in an urban drainage system to connect the shallow pipe network and the deep tunnel. By using the renormalization group (RNG) k~ε turbulence model with a volume of fluid method, the flow pattern and the maximum relative water depth over a stepped dropshaft with a different central angle of step were numerically investigated. The calculated results suggested that the flow in the stepped dropshaft was highly turbulent and characterized by deflection during the jet caused by the curvature of the sidewall. According to the pressure distribution on the horizontal step and the flow pattern above the step, the flow field was partitioned into the recirculating region, the wall-impinging region and the mixing region. In addition, with the increase in the central angle of step, the scope of the wall-impinging region and the mixing region increased and the scope of the recirculating region remained nearly unchanged. The maximum water depth increased with the increase in discharge. In the present work we have shown that, as the value of the central angle of step increased, the maximum water depth decreased initially and increased subsequently.

Published
2018
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3. Three-Dimensional Turbulence Numerical Simulation of Flow in a Stepped Dropshaft

Author

Yurong Wang, Jianmin Zhang, and Yongfei Qi

Subjects
lcsh:Hydraulic engineering, flow region, 0208 environmental biotechnology, Geography, Planning and Development, 02 engineering and technology, Aquatic Science, Curvature, Biochemistry, Physics::Fluid Dynamics, lcsh:Water supply for domestic and industrial purposes, Deflection (engineering), lcsh:TC1-978, Volume of fluid method, Water Science and Technology, lcsh:TD201-500, Central angle, Computer simulation, Turbulence, Mechanics, Renormalization group, 020801 environmental engineering, Water depth, stepped dropshaft, central angle of step, numerical simulation, Computer Science::Mathematical Software, Geology
Abstract

The dropshaft structure is usually applied in an urban drainage system to connect the shallow pipe network and the deep tunnel. By using the renormalization group (RNG) k~&epsilon, turbulence model with a volume of fluid method, the flow pattern and the maximum relative water depth over a stepped dropshaft with a different central angle of step were numerically investigated. The calculated results suggested that the flow in the stepped dropshaft was highly turbulent and characterized by deflection during the jet caused by the curvature of the sidewall. According to the pressure distribution on the horizontal step and the flow pattern above the step, the flow field was partitioned into the recirculating region, the wall-impinging region and the mixing region. In addition, with the increase in the central angle of step, the scope of the wall-impinging region and the mixing region increased and the scope of the recirculating region remained nearly unchanged. The maximum water depth increased with the increase in discharge. In the present work we have shown that, as the value of the central angle of step increased, the maximum water depth decreased initially and increased subsequently.

Published
2018

4. Three-Dimensional Turbulence Numerical Simulation of Flow in a Stepped Dropshaft.

Author

Qi, Yongfei, Wang, Yurong, and Zhang, Jianmin

Subjects
TURBULENCE, REYNOLDS number, COMPUTATIONAL fluid dynamics, COMPUTER simulation, FLUID dynamics
Abstract

The dropshaft structure is usually applied in an urban drainage system to connect the shallow pipe network and the deep tunnel. By using the renormalization group (RNG) k~ε turbulence model with a volume of fluid method, the flow pattern and the maximum relative water depth over a stepped dropshaft with a different central angle of step were numerically investigated. The calculated results suggested that the flow in the stepped dropshaft was highly turbulent and characterized by deflection during the jet caused by the curvature of the sidewall. According to the pressure distribution on the horizontal step and the flow pattern above the step, the flow field was partitioned into the recirculating region, the wall-impinging region and the mixing region. In addition, with the increase in the central angle of step, the scope of the wall-impinging region and the mixing region increased and the scope of the recirculating region remained nearly unchanged. The maximum water depth increased with the increase in discharge. In the present work we have shown that, as the value of the central angle of step increased, the maximum water depth decreased initially and increased subsequently. [ABSTRACT FROM AUTHOR]

Published
2019
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