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Modeling of Enhanced Geothermal Systems Using XFEM Technique

Rezaie Beydokhti, Omid | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54791 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khoei, Amir Reza
  7. Abstract:
  8. In this study, a fully coupled thermo-hydro-mechanical model for modeling Enhanced geothermal systems (EGS) is introduced using the extended finite method for numerical solution. Enhanced geothermal systems are fractured porous media that in addition to the solid phase usually consist of one or more fluids. Heat extraction from Enhanced geothermal systems involves several Multiphysics coupling processes, including the seepage flow through the fractured porous media, the thermal exchange between the working fluid and the matrix, and the deformation of fractured porous media. modeling of these processes is complex and has several parameters. Therefore, a thermal-hydraulic-mechanical (THM) coupling simulation for the EGS plays a crucial role in heat extracting from Enhanced geothermal systems. The system of coupled equations consists of linear momentum balance equation of solid phase, fluid continuity and thermal energy conservation equations. The main variables used to solve the system of equations are solid phase displacement, fluid pressure, solid temperature and fluid temperature. Strong discontinuity for the solid phase displacement field and weak discontinuity for the other three fields are assumed. A monolithic way of spatial discretization is used for the governing equations of fracture space and the surrounding media. The verifications show a good agreement between the results of this study and those of the existing literature. The results show that the effects of Fracture density and Fracture orientation on heat extraction from Enhanced geothermal systems. Also, they show the difference between LTNE and LTE models on the temperature field
  9. Keywords:
  10. Modeling ; Numerical Simulation ; Local Thermal Non-Equilibrium ; Extended Finite Element Method ; Thermo Hydromechanical Analysis ; Enhanced Geothermal Systems

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