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Vortex-Induced Vibrations of Free Spanning Pipelines

Hesabi, Amir Hossein | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41756 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ghoreishi, Reza; Abbaspour, Majid
  7. Abstract:
  8. When a submarine pipeline is laid, pipeline spans may exist due to the unevenness of the seabed. Such pipeline spans when exposed to currents, may undergo vortex-induced vibration (VIV). As the flow velocity increases, the cross-flow oscillation begins to occur and vortex shedding frequency may approach the natural frequency of the pipe span. Amplified response due to resonance between the vortex shedding frequency of the free span may cause fatigue damage. Thus, the determination of the critical allowable span length under the various environments becomes the most challenging areas in the offshore industry. A substantial research effort related to various aspects of VIV and free span pipelines has been seen during the last years. Some work has also been published on direct calculation on VIV on free span pipelines. In recent years, due to the improvement of computational power, some studies are initiated based on CFD simulation of VIV. The focus of this research is on development of the new approach for simulating VIV on marine pipelines at Reynolds number between 3000-4000 using LES method considering 2D fluid/rigid body interactions. Also, the effect of seabed proximity for free-spanning pipeline response amplitude was investigated. Moreover, a simulation around a free-spanning pipeline on South Pars oil and gas field was performed as a case study.
  9. Keywords:
  10. Pipelines ; Computational Fluid Dynamics (CFD) ; Vortex Shedding ; Vortex-Induced Vibration (VIV) ; Free Span

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