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Simulation of Density Currents with SPH Method

Ghasemi Varnamkhasti, Amir | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40866 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Firoozabadi, Bahar
  7. Abstract:
  8. Flows which density difference in a gravity field is their driven force are called Density Currents. Such flows are present in both nature and man made environments. Due to their importance, there have been large efforts to analyse them in both experimental and numerical way. In the present thesis, Smoothed Particle Hydrodynamics (SPH) is introduced as a new tool to simulate such flows. As the method is Lagrangian and particle based, simulation of Density Currents with particles can be addressed more naturally that can be accounted as the method preference to traditional mesh based methods. SPH projection method is incorporated to impose incompressibility. To precisely simulate Density Currents, SPH projection method capability to simulate Kelvin-Helmholtz instability has been studied. A solution for simulation of flows with low density difference and a method for effective mixing is introduced which are not present in previous studies. Lock-Exchange flow as a sample of Density Currents is simulated and the results have been compared to previous mesh based simulations in addition of experimental results. Succesfull simulation of miscible Density Current with low density difference, introduce a new application of SPH method which in previous has been considered as a limitation for this method.

  9. Keywords:
  10. Density Current ; Smoothed Particle Hydrodynamics (SPH) ; Kelvin-Helmholtz Instability ; Lock-Exchange Flow

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