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Investigation of the Effective Parameters on the Scouring Phenomenon of Seabed Pipelines by a Combination of Computational Fluid Dynamics and Discrete Elements Method

Mirza, Mitra | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55224 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Khorasanchi, Mahdi
  7. Abstract:
  8. Occurrence of scouring around the seabed pipelines can lead to pipe failure and pose a serious threat to the marine environment, economic losses and waste of oil and gas. Therefore, to prevent the occurrence of scouring, by simulating this phenomenon and identifying the parameters affecting it, we can help to design a more efficient placement of pipes in the seabed. Various methods such as potential flow theory and turbulent single-phase and two-phase models have been proposed to simulate this phenomenon. The purpose of this article is to simulate and investigate the effective parameters of this phenomenon by combining computational fluid dynamics and separate elements. The innovation of this method is that the information and behavior of each sand particle such as velocity, pressure and bed profile can be studied and the effect of fluid on the particle and vice versa can be obtained. Particle velocity and motion, particle pressure, drag force and bed profile were investigated in three stages of scour initiation, tunnel erosion and Lee-wake erosion. The scouring start time depends on the flow rate and the number of shields. At the onset of scouring, the depth of the cavity below the center of the pipe increases more rapidly and decreases with increasing depth of the cavity over time. In cases where the pipe is at an initial distance from the bed or is about a quarter of the diameter of the pipe in the sand, the profile of the scour bed is also studied and compared which showed that the depth of the scour cavity decreases with increasing e / D ratio
  9. Keywords:
  10. Discrete Element Method ; Computational Fluid Dynamics (CFD) ; Scour ; Subsea Pipeline ; Shields Number ; Bed Profile ; Bed Scour

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