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Numerical Prediction and Suppression of VIV of Deepwater Riser

[+] Author Affiliations
Toshiki Nozawa, Hideyuki Suzuki

The University of Tokyo, Kashiwa, Chiba, Japan

Makoto Ohta

Mitsubish Heavy Industries, Nagasaki, Nagasaki, Japan

Paper No. OMAE2010-20135, pp. 441-445; 5 pages
doi:10.1115/OMAE2010-20135
From:
  • ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
  • 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 6
  • Shanghai, China, June 6–11, 2010
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4914-9 | eISBN: 978-0-7918-3873-0
  • Copyright © 2010 by ASME

abstract

Deepwater risers and long pipe structures are used for offshore oil development and CO2 dilution into ocean concerning mitigation of global warming. Risers are installed in increasingly deeper water and sometimes catenary shape is used utilizing the relative flexibility. For example, riser designs such as Steel Catenary Riser (SCR), Compliant Vertical Access Riser (CVAR), Lazy Wave Steel Catenary Riser, etc. are investigated and put into practice. Vortex Induced Vibration (VIV) is one of the key technical issues which needs to be examined to maintain the integrity of the riser system. In this paper, development of a time domain VIV simulation scheme LINE3D_VIV is reported, and using the scheme fatigue damage of the structure is evaluated and the energy balance of riser is visualized to understand the behavior of VIV from the viewpoint of energy-balance. The analysis method is basically a nonlinear Finite Element Method (FEM) of underwater line structure. The VIV hydrodynamic force is calculated at each time step consulting database of VIV hydrodynamic force. VIV hydrodynamic force on a real scale pipe section subjected to harmonic oscillation was measure at high Reynolds number and arranged into the database. A numerical filter which evaluates amplitude, frequency and phase of local response of a riser from the time history of pipe vibration was developed. The database is consulted with the parameters and instantaneous VIV force is evaluated. Moreover, the validity of the simulation method was tested by comparison with the experiments carried out in Holland in 2005. In this paper, hydrodynamic force database for riser section with fairing was also constructed and numerical analysis to evaluate the effect of fairing was carried out.

Copyright © 2010 by ASME

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