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Investigation of the Depth Effects on Desalination Plants Turbulent Dense Jet Discharge Propagation by Large Eddy Simulation

Abdollahi Ashnani, Ali | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54053 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Firoozabadi, Bahar; Kazemzadeh Hanani, Siamak
  7. Abstract:
  8. The scarcity of potable water is one of the world's challenges. In the Middle East, this crisis is even worse and as a consequence, the most aggregation of desalination plants has been constructed in this area. However, brine effluent discharged from these plants entails serious environmental issues. Despite the extensive studies about the investigation of dilution and the area which faces the brine discharges as submerge jets, there are a few experimental investigations with a focus on the injecting brine discharge into the shallow environment. Whereas the Persian Gulf's coastal environment is shallow. Moreover, there is a huge construction of desalination held in this area. Accordingly, the current study numerically investigates the impacts of depth variation, specifically on the shallow environment. In the current study brine jet discharge at the present of the free surface has been simulated via OpenFoam software. For turbulence modeling, LES has been used to analyze coherent structures. Furthermore, two another turbulence approach: LES-RANS and RANS has been utilized for simulations. Furthermore, VOF model has been used for simulating free surfaces. Results for spatial characteristics and dilution for two sets of scenarios based on depth variation at constant Froude number and vice versa verified with experimental studies. The results depicted that the involved environmental area would be extended by either increasing the Froude number or decreasing the depth. Outcomes of this research were able to investigate the effects of free surface with a suitable accuracy. Besides, turbulence structures of buoyant jet were studied by considering the Q-criterion index
  9. Keywords:
  10. Turbulence Structure ; Free Surface ; Modified Volume of Fluid (VOF) ; Dense Jet ; Scale Adaptive Simulation (SAS)Turbulence Model ; Depth Effects ; Large Eddy Simulation (LES) ; Seawater Desalination

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