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Numerical Modeling of Jets Near a Hydraulic Jump
Liquid wastes from municipal and desalination activities are often discharged into the receiving water body in the form of wastewater jets. Such jets can significantly jeopardize the environment and ecology, so it is important to understand better the mixing properties of wastewater jets for an efficient design of the outfall systems and accurate evaluation of the environmental and ecological impacts. A hydraulic jump is a phenomenon in the science of hydraulics which is frequently observed in open channel flow such as rivers and spillways. When liquid at high velocity discharges into a zone of lower velocity, a rather abrupt rise occurs. The rapidly flowing liquid is abruptly slowed and increases in height, converting some of the flow's initial kinetic energy into an increase in potential energy, with some energy irreversibly lost through turbulence to heat. The hydraulic jump may significantly influence the mixing properties of a wastewater jet, so it is necessary to simulate the processes. However, numerical modeling of a wastewater jet near a hydraulic jump has rarely been previously reported, which motivated this research. In this study, a total of three cases are studied: a hydraulic jump without a jet, a hydraulic jump with a weaker jet, and a hydraulic jump with a stronger jet. A key novel observation from this study is that the jet trajectory is not stable probably because of the strong turbulence near the hydraulic jump. This study has established a basic numerical model for a jet near a hydraulic jump, which can be further used to investigate the influences of the locations and inclinations of the jets, and to conduct simulations of buoyant or negatively buoyant jets near a hydraulic jump.
Numerical Modeling of Jets Near a Hydraulic Jump
Liquid wastes from municipal and desalination activities are often discharged into the receiving water body in the form of wastewater jets. Such jets can significantly jeopardize the environment and ecology, so it is important to understand better the mixing properties of wastewater jets for an efficient design of the outfall systems and accurate evaluation of the environmental and ecological impacts. A hydraulic jump is a phenomenon in the science of hydraulics which is frequently observed in open channel flow such as rivers and spillways. When liquid at high velocity discharges into a zone of lower velocity, a rather abrupt rise occurs. The rapidly flowing liquid is abruptly slowed and increases in height, converting some of the flow's initial kinetic energy into an increase in potential energy, with some energy irreversibly lost through turbulence to heat. The hydraulic jump may significantly influence the mixing properties of a wastewater jet, so it is necessary to simulate the processes. However, numerical modeling of a wastewater jet near a hydraulic jump has rarely been previously reported, which motivated this research. In this study, a total of three cases are studied: a hydraulic jump without a jet, a hydraulic jump with a weaker jet, and a hydraulic jump with a stronger jet. A key novel observation from this study is that the jet trajectory is not stable probably because of the strong turbulence near the hydraulic jump. This study has established a basic numerical model for a jet near a hydraulic jump, which can be further used to investigate the influences of the locations and inclinations of the jets, and to conduct simulations of buoyant or negatively buoyant jets near a hydraulic jump.
Numerical Modeling of Jets Near a Hydraulic Jump
Lecture Notes in Civil Engineering
Walbridge, Scott (editor) / Nik-Bakht, Mazdak (editor) / Ng, Kelvin Tsun Wai (editor) / Shome, Manas (editor) / Alam, M. Shahria (editor) / el Damatty, Ashraf (editor) / Lovegrove, Gordon (editor) / Chen, X. (author) / Yan, X. (author) / Mohammadian, A. (author)
Canadian Society of Civil Engineering Annual Conference ; 2021
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021 ; Chapter: 15 ; 159-168
2022-05-18
10 pages
Article/Chapter (Book)
Electronic Resource
English
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