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Simulation of Transient Flow in Deformable Pipes and Networks

Niroomandi, Arash | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40517 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Borghei, Mahmoud
  7. Abstract:
  8. Water hammer is a pressure surge or wave resulting when a pressurized fluid in motion is forced to stop or change direction suddenly. This phenomenon can cause great amount of damage to the system and should be considered in designing of pipe systems. So, researchers have derived and proposed numerous models using different approaches. In this study a one-dimensional model using Time Splitting Method (TSM) and Double Sweep Method (DSM) are proposed to simulate transient flow in deformable pipes in networks. To solve the equations of momentum and continuity TSM is applied. In addition Brunone model is used to study the effect of unsteady friction on water hammer wave shape and attenuation. To consider the deformation of the cross section of the pipe due to change of pressure, the Hook's Law of elasticity is used. In addition, for simulating transient flow in networks DSM is applied. In the case of simple reservoir-pipeline-valve system results from the proposed model are compared with analytical and experimental results for water hammer cases with different Reynolds number. It has been shown that for low Reynolds number the results are not in good agreement with experimental measurements, however, for low Reynolds number turbulent flows the results of the proposed model show a good compatibility with experimental measurements. In addition the effect of pipe elasticity was also investigated on water hammer pressure waves. The results show that as the flexibility of the pipe increases, the value of the water hammer pressure wave decreases considerably. Finally, in order for the model to be validated in pipe networks, the results of the proposed model were compared with analytical solutions. Besides, the influence of the pipe flexibility on reduction of the values of the pressure waves were investigated, which showed that the model is capable to simulate transient flow in networks
  9. Keywords:
  10. Transition Flow ; Water Transfer ; Deformable Pipe ; Time Splitting Method ; Double Sweep Method

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