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Numerical modeling of \(30^{\circ }\) and \(45{^\circ }\) inclined dense turbulent jets in stationary ambient

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Abstract

Dispersion of turbulent jets in shallow coastal waters has numerous engineering applications. The accurate forecasting of the complex interaction of these jets with the ambient fluid presents significant challenge and has yet to be fully elucidated. In this paper, numerical simulation of \(30{^\circ }\) and \(45{^\circ }\) inclined dense turbulent jets in stationary water have been conducted. These two angles are examined in this study due to lower terminal rise heights for \(30{^\circ }\) and \(45{^\circ }\), this is critically important for discharges of effluent in shallow waters compared to higher angles. Mixing behavior of dense jets is studied using a finite volume model (OpenFOAM). Five Reynolds-Averaged Navier–Stokes turbulence models are applied to evaluate the accuracy of CFD predictions. These models include two Linear Eddy Viscosity Models: RNG \( k-\varepsilon \), and realizable \(k-\varepsilon \); one Nonlinear Eddy Viscosity Model: nonlinear \(k-\varepsilon \); and two Reynolds Stress Models: LRR and Launder–Gibson. Based on the numerical results, the geometrical characteristics of the dense jets, such as the terminal rise height, the location of centerline peak, and the return point are investigated. The mixing and dilution characteristics have also been studied through the analysis of cross-sectional concentration and velocity profiles. The results of this study are compared to various advanced experimental and analytical investigations, and comparative figures and tables are discussed. It has been observed that the LRR turbulence model as well as the realizable \(k-\varepsilon \) model predicts the flow more accurately among the various turbulence models studied herein.

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Acknowledgments

This publication was made possible by NPRP grant #4-935-2-354 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors. The authors are also grateful to the anonymous reviewers for their helpful comments.

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Authors and Affiliations

  1. Department of Civil Engineering, University of Ottawa, 161 Louis Pasteur, CBY A114, Ottawa, ON, K1N 6N5, Canada

    Hossein Kheirkhah Gildeh, Abdolmajid Mohammadian & Ioan Nistor

  2. Department of Chemical Engineering, Qatar University, P. O. Box 2713, Doha, Qatar

    Hazim Qiblawey

Authors
  1. Hossein Kheirkhah Gildeh
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  2. Abdolmajid Mohammadian
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  3. Ioan Nistor
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  4. Hazim Qiblawey
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Correspondence to Hossein Kheirkhah Gildeh.

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Kheirkhah Gildeh, H., Mohammadian, A., Nistor, I. et al. Numerical modeling of \(30^{\circ }\) and \(45{^\circ }\) inclined dense turbulent jets in stationary ambient. Environ Fluid Mech 15, 537–562 (2015). https://doi.org/10.1007/s10652-014-9372-1

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  • DOI: https://doi.org/10.1007/s10652-014-9372-1

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