Lifting-induced stability loss of vessels in shallow water. (1st June 2022)

• Record Type: Journal Article
• Authors: Yu, Yaru; Johnson, Nick
• Is Part Of: Ocean engineering. Volume 253(2022)
• Publication Date: 2022-06-01
• Subjects: Lifting -- Stability loss -- Shallow water -- Double-peak-roll phenomenon -- Beam waves -- URANS; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2022.111297
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: By incorporating several series of results from both experimental scale-model tests and URANS-based simulations, the transverse stability of a model (1:20) under lifting condition in shallow water is investigated and quantified. According to the results, a non-dimensionalised mass of 0.66 (% Δ ) on top of the lifting boom reduces GZ lever up to around 40% in calm water. In waves, the lifted object increases roll amplitude about 7–56% near roll natural frequency, and the smaller the waves, the larger the influence. Shallow water starts to have effects on roll, pitch, heave, and sway motions from a water depth/draught ratio of about 7 as opposed to 4 suggested by ITTC (2005). Maximum variations of those motion amplitudes are about 77%, 110%, 25%, and 500%, respectively. Double-peak-roll phenomenon appears to be both wave-frequency-dependant and water-depth-related, but at a depth/wavelength ratio of about 0.45 and above, motions are not affected. Highlights: Stability loss due to lifting operation in beam waves is investigated and quantified. Motion responses under lifting condition in shallow water are discussed. Double-peak-roll phenomenon is both wave-frequency-dependant and water-depth-related.