Abstract
In some outfall systems, wastewaters are discharged into ambient water bodies using rosette-type diffusers in the form of multiple buoyant jets, and it is essential to simulate their mixing characteristics for practical applications and optimal design purposes. The mixing processes of a rosette jet group are more complicated than single jets and multiple horizontal or vertical jets, and thus the existing methods cannot be effectively used to simulate their mixing and dilution properties. With the recent advancements in numerical modeling approaches, numerical simulation of wastewater jets as three-dimensional phenomena can be feasible. The present study deals with a fully three-dimensional numerical simulation for buoyant jets discharged from a rosette-type multiport diffuser, with the standard and re-normalization group (RNG) k-ε turbulence models. The simulated results are compared with experimental data, and the results show a good agreement with the experimental data, demonstrating that the numerical model is an efficient and effective tool for simulating rosette jet groups. It was also concluded that the RNG k-ε model leads to better results than the standard k-ε model with a comparable computational cost. The validated model was further utilized to investigate the influences of port inclinations on the mixing behaviors.
Highlights
Wastewater jets that have a lower density than the ambient water often emanate from desalination and municipal activities [1,2,3]
Three-dimensional numerical modeling of buoyant jets discharged from a rosette-type multiport diffuser was conducted
The simulated results obtained from the standard and re-normalization group (RNG) k-ε turbulence closures were compared to measurements
Summary
Wastewater jets that have a lower density than the ambient water often emanate from desalination and municipal activities [1,2,3]. These discharges are known as buoyant jets [4], and improper disposal of these discharges may result in significant environmental and ecological impacts [5,6]. After discharged from the ports, the jets are typically bent over toward the upward direction because they have a lower density than the ambient water. These jets may interact with each other if the port spacing is not sufficiently large. The buoyant jets discharged from a rosette-type diffuser are
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