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Simulation of Magnetohydrodynamic Flow in the MWEC Generator Duct Using OpenFOAM Software

Azadi, Ehsan | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43739 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Taghizadeh Manzari, Mehrdad
  7. Abstract:
  8. Magnetohydrodynamic (MHD) flow is concerned with the interaction between the magnetic field and electrically conducting fluid flow. In this investigation, the MHD flow in the duct of magnetohydrodynamic wave energy conversion (MWEC) generator was simulated by use of OpenFOAM software. In the MWEC generator the reciprocating motion of ocean waves lead to electrically conducting fluid flow in the duct of this generator. By applying magnetic field perpendicular to this flow, electric current generate in the fluid. This generator has a higher efficiency compared with other ocean wave energy conversion generators. Firstly, to evaluate accuracy and performance of mhdFOAM code of OpenFOAM, three cases include fluid flow without applying magnetic field, applying magnetic field to the static fluid, and electrically
    fluid flow under applied magnetic field (hartmann problem) have modeled.To determine schemes with most stable and fastest rate of convergence of numerical solution, various discretization schemes of convective termes was assessed and compared. The simulation of MHD flow in the MWEC generator duct shows that applying uniform magnetic field result in formation of large vortices in the intrance of duct and subsequently significant dissipation in the generator. Therfore, to optimize the MHD flow in duct, with analysis of various nonuniform magnetic fields,the appropriate distribution of nonuniform magnetic field applying on fluid flow was obtained. Consequently the applying of obtained distribution lead to the suitable condition for velocity and pressure distribution in MHD duct flow.
  9. Keywords:
  10. Magnetohydrodynamic ; Magnetohydrodynamic (MHD)Generator ; OpenFOAM Software ; Convective Termes Discretization Scheme ; Flow Optimization

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