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Modeling Multiphase Fluid Flow Using SPH

Safdari Shadloo, Mostafa | 2008

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39377 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Taghizadeh Manzari, Mehrdad
  7. Abstract:
  8. Smoothed Particle Hydrodynamics (SPH) is a Lagrangian method for simulation of fluid flow. Movable particles are used to interpolate fluid properties instead of fixed Eulerian grids in this method. By essence, the aforesaid particles are movable points which carry the fluid properties such as temperature, enthalpy, density, etc. these variables can also be the stress, strain or the rheological properties of the fluid. Thus, this method needs no grids and the fluid properties are calculated using an interpolation mechanism which classifies this method as meshless. A computational code is designed using SPH for the simulation of multiphase flows. Usage of the Lagrangian formulation has made it possible for the SPH method to accurately simulate flows with free surface and interfacial flows. Good agreement between the numerical and experimental results shows the ability of this method for the simulation of such flows. On the other hand various ways of modeling wall boundaries makes this method able to simulate problems with complex geometries. After solving benchmarks, the problem of dam breaking is solved. Due to its high usage, this problem has been focused by scientists and engineers. It is shown that the current results are comparable with the existing works. Then the tested code is used to solve the Kelvin-elmholtz instability. After code validation using the analytical relations, the factors of the creation of the primary instability and also the secondary instabilities are studied. In these two problems the simulations of free surface, interfacial and the wave front show good quantitative and qualitative results
  9. Keywords:
  10. Multiphase Flow ; Free Surface Flow ; Meshless Method ; Smoothed Particle Hydrodynamics (SPH) ; Multiphase Flow ; Fluid Free Surface

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