Roll motion response analysis of damaged ships in beam waves

Hu, Lifen and Wu, Hao and Yuan, Zhiming and Li, Wubin and Wang, Xiangyang (2021) Roll motion response analysis of damaged ships in beam waves. Ocean Engineering, 227. 108558. ISSN 0029-8018 (https://doi.org/10.1016/j.oceaneng.2020.108558)

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Abstract

The seakeeping performance of a damaged ship is highly correlated to the wave incident direction. Therefore, predicting the motion responses of a damaged ship under various incoming waves is important. In this study, the seakeeping performance of a DTMB 5415 model is investigated by focusing on its roll motion under beam wave condition. The model performance under an incident wave angle (α) of 180° is widely studied experimentally and numerically. But the behaviours of a damaged ship under α = 0° remain unknown. This study aims to analyse the damaged ship motion performance under this rarely studied condition. The volume of fluid (VOF) free-surface technique is used to solve the Reynolds-averaged Navier–Stokes equations, as well as with the dynamic overset technology that handles the mesh update, the wave generation, time step and fast Fourier transform are utilised to validate the effectiveness of the adopted method. The numerical results are validated against the experimental results obtained when α = 180°. The same methodology is extended to investigate the three-degrees-of-freedom motion (roll, pitch and heave) at α = 0°. Results show that the roll motions under the two wave conditions greatly differ from each other. The discussions highlight the analysis of the possible reasons for this difference.

ORCID iDs

Hu, Lifen, Wu, Hao, Yuan, Zhiming ORCID logoORCID: https://orcid.org/0000-0001-9908-1813, Li, Wubin and Wang, Xiangyang;
CORE (COnnecting REpositories)