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Numerical Simulation of Cavitating Flows with Ventilation Using Multiphase Navier-Stokes Equations

Azizollahi Najafabadi, Alireza | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41672 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Hejranfar, Kazem
  7. Abstract:
  8. In this study, the numerical simulation of natural and ventilated cavitating flows is performed. The algorithm employs the homogenous, multiphase Navier-Stokes equations with appropriate mass transfer terms.The base line differential equations system is comprised of the mixture volume, mixture momentum and constituent volume fraction equations. A three species differential formulation is considered for constituent volume fraction transport/generation of liquid, condensable vapor and non-condensable gas fields.The system of governing equations is discretized using a cell-centered finite volume Roe’s upwind scheme. Both laminar and turbulent cavitating flows are considered in this study. For turbulence flow computations, the algebraic Baldwin-Lomax (BL) turbulence model is used. A sensitivity study isconducted to evaluate the effects of various parameters such as density ratio and grid size on the accuracy and performance of thesolution. The computations are presented for steady noncavitating/cavitating flows around 2D/axisym metric geometries for different conditions and the results are compared with the available numerical and experimental data. Then, the numerical simulation of ventilated cavity is performed over an axisymmetric blunt fore-body configuration. A range ofinjection mass flow rates specified, yielding a range of ventilated cavity sizes, is considered to study the effects of the injection of non-condens able gas on the hydrodynamic characteristics. Results show that the solution algorithm presented is accurate and efficient for predicting noncavitating/cavitating flows with/without ventilated gas over 2D/axisymmetric geometries.

  9. Keywords:
  10. Cavitation Flow ; Gas Injection ; Multiphase Navier-Stokes Equation ; Roe Upwind Scheme

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