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A Comparison of Experiment and FSRVM Modelling of Larger Than Normal Bilge Keels

[+] Author Affiliations
R. A. Braddock, R. J. Timms, K. P. Thiagarajan

University of Western Australia, Crawley, WA, Australia

Paper No. OMAE2005-67362, pp. 707-713; 7 pages
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 1, Parts A and B
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4195-2 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME


This paper details an experimental study on bilge keels of up to 20% of half beam of a FPSO with rectangular geometry. Both free decay and forced oscillation tests were conducted on a range of bilge keel widths at different amplitudes and frequencies. The results show that, for a given amplitude of roll motion, the damping coefficient increases with increasing bilge keel size up to a certain point and then declines. Numerical simulations using the free surface random vortex method were performed on rectangular cross-sections with bilge keels which show good agreement with the experimental results. Simulations of the effect of even larger keels indicates that the same trend for damping coefficient as a function of keel size is found. An examination of the simulation results suggests a likely explanation for this behaviour.

Copyright © 2005 by ASME
Topics: Modeling , Keel



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