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Study of the Wave Drift Damping for a Very Large Crude Carrier

[+] Author Affiliations
Joel S. Sales, Jr., Andre R. da Silva, Sergio H. Sphaier

LabOceano/COPPE/UFRJ, Rio de Janeiro, RJ, Brazil

Vinicius L. F. Matos, Gérson B. Matter

Petrobras, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2007-29591, pp. 745-753; 9 pages
doi:10.1115/OMAE2007-29591
From:
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 4: Materials Technology; Ocean Engineering
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4270-3 | eISBN: 0-7918-3799-8
  • Copyright © 2007 by ASME

abstract

Pull-out test and decay tests in still water and in waves for the surge motion of a VLCC in ballast condition are carried out at LabOceano. The pull-out test associated with the mean drift displacement in regular waves is used to determine mean drift force. From the decay tests the damping coefficients are adjusted using the Froude energy method and the procedure based on the logarithm decrement. For the decay test in waves, the response is subdivided in the mean drift contribution, the regular wave response and the transient response. The wave drift damping is considered as an increase on the linear damping in still water. So, we introduce an additional damping to the linear part of the damping coefficient in still water and simulate the decay test in waves. Comparing the results from the simulation with the experiments the wave drift damping contribution is adjusted. Finally, the mean drift results are compared with the results obtained with the potential theory. The wave drift damping coefficients obtained from the experiments are compared with coefficients obtained with a formulation proposed in the literature.

Copyright © 2007 by ASME
Topics: Damping , Wave drift , Tankers

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