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Effect of Wind Loads on the Performance of Free-Fall Lifeboats

[+] Author Affiliations
Thomas Sauder, Eloise Croonenborghs, Sebastien Fouques, Nabila Berchiche

MARINTEK, Trondheim, Norway

Svein-Arne Reinholdtsen

STATOIL ASA, Stjørdal, Norway

Paper No. OMAE2014-24456, pp. V04BT02A033; 11 pages
doi:10.1115/OMAE2014-24456
From:
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 4B: Structures, Safety and Reliability
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4543-1
  • Copyright © 2014 by ASME

abstract

The paper presents a model describing the launch of free-fall lifeboats from offshore structures in strong environmental wind.

Six-degrees-of-freedom numerical simulations of the lifeboat launch are performed using the free-fall lifeboat simulator VARUNA with a complete set of wind coefficients for the lifeboat. Those wind coefficients are obtained by CFD simulations validated against wind tunnel tests. The lifeboat launch simulations are then verified against time-domain CFD simulations of the whole launch in air until water entry.

It is shown by means of numerical simulations that wind-induced loads on the lifeboat have a strong influence on its kinematics until water entry, and subsequently on the acceleration loads experienced by the occupants, on the structural loads on the lifeboat, and on its forward speed after water exit.

It is concluded that the effect of wind-induced loads on the lifeboat performances should in general be investigated when establishing the operational limits for a given offshore installation.

Copyright © 2014 by ASME

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