IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : An experimental and numerical study of submerged hydraulic jumps forming at low-head dams
An experimental and numerical study of submerged hydraulic jumps forming at low-head dams
Author : MARTA LOPEZ-EGEA(1), IOAN NISTOR(2), RONALD TOWNSEND(3), BHUWANI PAUDEL(4), PAUL SULLIVAN(5)
h includes both experimental and numerical modelling results, investigates the potentially dangerous conditions that can occur when low-head dams (or ‘weirs’) are overtopped and submerged-type hydraulic jumps form in the immediate downstream channel. The combination of high local turbulence levels, air entrainment, and strong surface currents associated with submerged jumps (also known as submerged ‘rollers’) can pose a significant risk to swimmer and boater safety. In this study, the conditions governing the formation of submerged jumps, as well as their dynamic characteristics, are investigated for a wide range of flows and different boundary conditions. The research seeks to establish improved guidelines for the design and safe operation of low-head dams. The experimental phase of the study involved physical model tests to determine: (i) the hydraulic conditions that govern the submerged jump formation, and (ii) the dynamic characteristics of the surface roller (vortex). The numerical modelling work used ‘interFoam’, which is an Eulerian 3D solver, included in the OpenFOAM toolbox, for multiphase incompressible fluids that features the Volume of Fluid approach (VOF) to capture the air-water interface. The numerical model developed in this study was subsequently validated with the experimental data. The analysis conducted on the time-history of the kinetic energy production sheds new light on the mechanism of formation of submerged hydraulic jumps and their dynamic characteristics.Form Required :
File Size : 1,310,798 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 19/08/2015
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