Numerical study of the green water on a wave-piercing tumblehome vessel and the hydrodynamic loads

• Published in: Ocean engineering 2024-10, Vol.309, p.118313, Article 118313
• Main Authors: Shan, Lei, Xu, Guodong
• Format: Article
• Language: English
• Subjects: Green water; Hydrodynamic loads; Numerical simulation; Tumblehome vessel
• ISSN: 0029-8018; 1873-5258
• DOI: 10.1016/j.oceaneng.2024.118313

The wave-piercing tumblehome (WPTH) vessel has special geometric characteristics, its hull is inclined to suffer significant green water and corresponding hydrodynamic loads. The motions of a WPTH vessel in heading waves are simulated using commercial computational fluid dynamics (CFD) software. It is found that the typical green water process consists three stages: water collision above the bulbous, green water convergence, and green water jet flow impact. In stage 1, collision of two streams above the bulbous bow causes a high pressure area like a butterfly. The convergence of green water induces high pressure in stage 2, and the green water jet flow in stage 3 results high impact pressure on the superstructure. The vertical bending moments are calculated by introducing a field function. The green water and bow slamming have less effects on the vertical bending moment but cause considerable local hydrodynamic loads. •Typical green water of the wave-piercing tumblehome vessel consists three stages.•Collision of streams over the bulbous results a butterfly-shaped pressure zone.•Green water from broadsides converges and high pressure is induced on the deck.•An accelerated water jet impacts on the superstructure and causes high pressure.