Numerical investigation of the behaviour of the submerged buoyant jet along sloped bottom topography and into stratified flow ambient

Date

2024-6

Author

Budak Çötel, Ezgi

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Behavior of the submerged buoyant jets is affected by several factors, such as initial momentum, initial buoyancy of the discharge, depth at which the effluent occurs, orientation of the jet, ambient currents, receiving waterbody density profiles, etc. All of these must be taken into account when designing submerged outfalls in order to minimize the environmental impact of the discharge, and must also be considered when developing numerical models. This study focused on two different cases to investigate the flow characteristics of a submerged buoyant jet. For all of the simulations, the buoyantPimpleFoam solver of OpenFOAM was used. The first case investigated the behavior of a negatively buoyant jet along a sloped bottom topography at various jet orientations and flow conditions. Simulation results of this case demonstrated that the behavior is greatly affected by the velocity profile of the outlet occured due to the bottom slope and the outlet orientation. The cases of uniform velocity profile and non-uniform velocity profile were scrutinized in order to establish mathematical relationships to predict the jet terminal rise height, the vertical centerline peak distance and the impact point of the jet. The second model explored the limiting jet velocity of a buoyant jet as it breaks up into the interface of a two-layered stratified flow. The findings were compared with previously collected experimental data. The results of the present study showed good correlations with the experimental data that the numerical model results.

Subject Keywords

Submerged buoyant jet, Stratified flow ambients, OpenFOAM

URI

https://hdl.handle.net/11511/110113

Collections

Graduate School of Natural and Applied Sciences, Thesis