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Effects of Coupled Hydrodynamic in the Performance of a DP Barge Operating Close to a FPSO

[+] Author Affiliations
Daniel P. Vieira, Edgard B. Malta, Fabiano P. Rampazzo, Eduardo A. Tannuri

University of São Paulo, São Paulo, SP, Brazil

João Luis B. Silva

Petrobras, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2011-49411, pp. 339-346; 8 pages
doi:10.1115/OMAE2011-49411
From:
  • ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology; Polar and Arctic Sciences and Technology
  • Rotterdam, The Netherlands, June 19–24, 2011
  • ISBN: 978-0-7918-4433-5
  • Copyright © 2011 by ASME

abstract

In ocean systems composed by two or more closing floating bodies, coupled hydrodynamics effects must be considered. Dynamic positioned systems (DP), for example, need an accurate determination of environmental forces to guarantee a safe operation. This work presents a numerical methodology, using the WAMIT code, to evaluate both first order motions and mean drift forces of a system composed by a DP Crane Barge operating close to a turret-moored FPSO. The first order wave forces were evaluated using the code standard method. The second order forces (or mean drift forces) were obtained using the alternative control surface method. The work discussions are centered on the effects of FPSO presence on DP Barge hydrodynamics. Two relative positions between vessels were evaluated as well as three FPSO drafts (full, intermediate and ballasted). The effects of wave incidence angle were also discussed.

Copyright © 2011 by ASME
Topics: FPSO

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