Numerical Simulation of Vertical Buoyant Wall Jet Discharged into a Linearly Stratified Environment
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 7
Abstract
Results are presented from a numerical simulation to investigate the vertical buoyant wall jet discharged into a linearly stratified environment. A tracer transport model considering density variation was implemented. The standard model with the buoyancy effect was used to simulate the evolution of the buoyant jet in a stratified environment. Results show that the maximum jet velocity trend along the vertical direction has two regions: acceleration and deceleration. In the deceleration region, jet velocity is reduced by the mixing taking place between jet fluid and ambient lighter fluid. Jet velocity is further decelerated by the upward buoyant force when ambient fluid density is greater than jet fluid density. The normalized peak value of the cross-sectional maximum jet velocity decreases with (the ratio between the characteristic momentum length and the buoyancy length). When , the dimensionless maximum penetration distance (normalized by the characteristic buoyancy length) does not vary much and has a value between 4.0 and 5.0, whereas it increases with increasing for . General good agreement between the simulations and measurements was obtained, indicating that the model can be successfully applied to investigate the mixing of buoyant jet with ambient linearly stratified fluid.
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Acknowledgments
The research reported in this paper is financially supported by the UK Engineering and Physical Sciences Research Council (EPSRC: EP/G066264/1), the National Natural Science Foundation of China (51609214, 41376099, and 51609213), the National Natural Science Foundation for Distinguished Young Scholars of China (Grant No. 51425901), the Public Project of Zhejiang Province (2016C33095), and the Key Project of Zhejiang Science and Technology (2015C03003). The comments and suggestions made by the chief editor, the associate editor, and reviewers significantly improved the quality of the manuscript.
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©2018 American Society of Civil Engineers.
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Received: Oct 26, 2016
Accepted: Dec 8, 2017
Published online: May 3, 2018
Published in print: Jul 1, 2018
Discussion open until: Oct 3, 2018
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