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Study of Vortex-Induced Vibration of Cylindrical Structure Using Numerical Method

Seyedsharifi, Zahra | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55205 (09)
  4. University: Sharif University of Technolog
  5. Department: Civil Engineering
  6. Advisor(s): Raie, Mohammad
  7. Abstract:
  8. The purpose of this study is to numerically investigate the Vortex-Induced Vibration (VIV) around the cylinder, which occurs in many engineering structures, including offshore structures, offshore risers, deep-sea pipelines, bridges, cables, and tall buildings. This phenomenon is non-linear and self-limitting and is the major cause of fatigue and failure in engineering structures. At the same time, it is possible to harvest Aquatic Clean Energy from Vortex-Induced Vibration. This research investigates the single degree of freedom and two degrees of freedom oscillator. The numerical model is validated using an experimental model in the Sharif University of Technology's advanced hydraulics lab. Tests are done in the Reynolds number range from 5000 to 6600. Following validation, the oscillator's motion pattern is investigated, as well as the effect of system damping on the oscillation and energy harvesting from this phenomenon. The harvested power of the two-degree-of-freedom motion is then compared to the single-degree-of-freedom motion. The results indicate that since the two degrees of freedom oscillator can harvest energy from both vertical and horizontal oscillations, it harvests more power than the single degree of freedom oscillator. For instance, in two degrees of freedom oscillation with a damping ratio of 0.1, the harvested power at flow velocity of 0.27 m/s is 1.175 and 3.283 watts, respectively. Also, the results show that at a constant damping ratio with increasing flow velocity from 0.25 to 0.33 m/s, in both one and two degrees of freedom oscillation, the harvested power increases. For instance, in two degrees of freedom oscillation at a constant damping ratio of 0.3, with increasing flow velocity from 0.25 to 0.33 m/s, the harvested power increases from 5.215 to 14.819 watts, while in the same conditions in one degree of freedom oscillation, the harvested power increases from 2.344 to 4.346 watts.
  9. Keywords:
  10. Numerical Method ; Computational Fluid Dynamics (CFD) ; Cylinder ; Finite Volume Method ; Vortex-Induced Vibration (VIV)

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