Numerical Study on the Effect of Buffer Bow Structure in Ship-to-ship Collisions

Yasuhira Yamada, Hisayoshi Endo, Preben Terndrup Pedersen

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

A disastrous oil spill from a struck oil tanker has become one of the major problems in view of conservation of maritime environment. So far double hulls (D/H) have been introduced to reduce the consequences of collision and grounding events In order to further reduce the oil spill from struck oil tankers, the introduction of buffer bulbous bows has been proposed. Relatively soft buffer bows absorb part of the kinetic energy of the striking ship before penetrating the inner hull of the struck vessel. The purpose of the present paper is to verify the effectiveness of a prototype buffer bulbous bow structure in ship-ship collisions as compared with that of standard bulbous bows. This is demonstrated by conducting a series of large-scale finite element analyses. The finite element analyses are conducted with the general-purpose nonlinear structural code “LS-DYNA”. The applied scenario is one where a very large crude oil carrier (VLCC) in ballast condition collides with the midship region of a D/H VLCC in a laden condition. Fracture of fillet welds, elastic-plastic material properties and strain rate effects, are taken into account in the simulations. The effect of the equivalent failure strain (FS) and the forward velocity of the struck ship on the collapse mode of the bow of the striking vessel are investigated. Collapse modes, contact forces and energy absorption capabilities of the buffer bows are compared with those of conventional bows.
Original languageEnglish
JournalProceedings of the 15th International Offshore and Polar Engineering Conference (ISOPE) Seoul, Korea, June 19 - 24
Pages (from-to)604 - 611
ISSN1098-6189
Publication statusPublished - 2005
Event15th International Offshore and Polar Engineering Conference - Seoul, Korea, Republic of
Duration: 19 Jun 200524 Jun 2005
http://www.isope.org/conferences/conferences.htm

Conference

Conference15th International Offshore and Polar Engineering Conference
CountryKorea, Republic of
CitySeoul
Period19/06/200524/06/2005
Internet address

Cite this