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Time Domain Methodology for Vortex-Induced Motion Analysis in Monocolumn Platform

[+] Author Affiliations
Thiago Ângelo Gonçalves de Lacerda, Gilberto Bruno Ellwanger, Marcos Queija de Siqueira

COPPE - Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil

Elizabeth Frauches Netto Siqueira

CENPES - Petrobras, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2009-79806, pp. 717-722; 6 pages
doi:10.1115/OMAE2009-79806
From:
  • ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology
  • Honolulu, Hawaii, USA, May 31–June 5, 2009
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4341-3 | eISBN: 978-0-7918-3844-0
  • Copyright © 2009 by ASME

abstract

The offshore oil exploration in Brazil has been, traditionally, made by semi-submersible and moored ship-based units. The need for more restricted wave-induced motions has demanded new conceptions of floating structures, in which the mono-column concept distinguishes itself. Due to its cylindrical shape hull, this floating unit could present a significant low frequency vibratory movement caused by the vortex shedding phenomenon. This kind of phenomenon on huge structures like platforms is usually known as VIM (Vortex Induced Motions). The main objective of this work is to evaluate a time domain methodology applied in VIM problems. This methodology uses a Van der Pol equation to represent the vortex shedding phenomenon. The force calculation schemes presented in this work are applied in physical examples and its results will be compared to model test data. The analyses were performed in a non linear dynamic analysis program, using a six degree of freedom model, developed for this study.

Copyright © 2009 by ASME
Topics: Motion , Vortices

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