Influence of bilge-keel configuration on ship roll damping and roll response in waves

Yichen Jiang, Yunfeng Ding, Yuan Sun, Yanlin Shao, Lei Sun*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The bilge keel, which is a widely used tool for passively reducing the roll motion of ships, generates and releases vortices periodically when the ship rolls, leading to dissipation of the roll kinetic energy and rise in the roll damping of the ship. The initial heel angle, the height and installation angle of the bilge keel, as well as roll frequency, all affect the vortex evolution at the bilge, causing differences in the roll damping to varying degrees. The two-dimensional roll decay of a typical Panamax ship model is simulated based on the free surface random vortex method (FSRVM). A new way of vortex generation is introduced in the current numerical model, and validated against experiments. The additional roll damping induced by bilge keel of different heights and installation angles is compared. In addition, the effects of bilge-keel configurations on roll motion under regular waves are also discussed. Based on the simulation, the characteristics and mechanism of bilge keel with different parameters on roll damping reduction are discussed. The preferred bilge-keel installation angle and the existence of the bilge-keel critical height are also reported.

Original languageEnglish
Article number107539
JournalOcean Engineering
Volume216
Number of pages20
ISSN0029-8018
DOIs
Publication statusPublished - 2020

Keywords

  • Bilge keel
  • Random vortex method
  • Roll damping
  • Roll decay
  • Roll response in waves

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