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Some Innovations in Numerical Simulation of Inviscid Three Dimensional Flow with Moving Boundaries

Ramezani, Ali | 2009

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 39539 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mazaheri, Karim
  7. Abstract:
  8. The main subject of this thesis is to improve conventional CFD algorithms applied in numerical simulation of inviscid unsteady flows around moving boundaries with large relative motions, on unstructured grids. All challenges in this regard are reviewed, and appropriate efficient schemes are introduced to address them. A new scheme is presented for valid grid generation during grid movement and is implemented for 2D and 3D problems. Customary three dimensional convergence acceleration techniques such as implicit time stepping and multigriding have been applied. For implicit solution of the flow equations a new algorithm is used. Via a special renumbering algorithm, the approximate factorization scheme is applicable on unstructured grids. A new agglomeration scheme is used which allows multigrid scheme to be applied on a general unstructured grid in a fast manner, and producing appropriate geometrical shapes. Combination of implicit and FAS multigrid solution has been used to achieve higher convergence acceleration. In parallel processing section, some steady state flows have been simulated by static load balancing schemes and they have resulted in the scalable speedup. As a challenge, transient flow around moving boundaries which result in topological changes in the grid connectivity is solved. Some dynamic load balancing techniques have been applied using an innovative manner for the above grid movement algorithm
  9. Keywords:
  10. Numerical Solution ; Inviscid Flow ; Moving Boundary ; Parallel Processing ; Three Dimentional Unstructured Grids

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