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

OCEAN ENGINEERING

卷:216

Article

Jiang, Yichen¹  Ding, Yunfeng¹  Sun, Yuan²  Shao, Yanlin³  Sun, Lei¹ 

[1] Dalian Univ Technol, Sch Naval Architecture, 2 Linggong Rd, Dalian, Peoples R China

[2] Chinese Acad Sci, Shenyang Inst Automat, State Key Lab Robot, Shenyang, Peoples R China

[3] Tech Univ Denmark, Dept Mech Engn, Lyngby, Denmark

关键词: Bilge keel;    Roll decay;    Roll damping;    Roll response in waves;    Random vortex method;   

DOI  :  10.1016/j.oceaneng.2020.107539

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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