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Oblique wave effects on the hydrodynamic responses of side-by-side moored FLNG and LNGC

Lookup NU author(s): Professor Zhiqiang Hu, Dr Xiangyin Meng



This is the authors' accepted manuscript of an article that has been published in its final definitive form by ASCE, 2018.

For re-use rights please refer to the publisher's terms and conditions.


The motion responses prediction of side-by-side moored FLNG (Floating Liquefied Natural Gas) and LNGC (Liquefied Natural Gas Carrier) under oblique waves is critically important to validate operational security. This article studies the hydrodynamic interactions of side-by-side moored FLNG+LNGC under oblique waves by both numerical simulation and model testing. Artificial damping method, calibrated through gap wave elevations measured in model tests, is adopted to simulate the viscous effect in the gap region using the state-of-the-art software Hydrostar (Bureau Veritas, 2007). The hydrodynamic performances of the side-by-side system under oblique waves are investigated. Relative motions under different wave directions are also investigated and the resonant phenomena are analyzed through phase shift. The investigations indicate that motion responses of FLNG are less affected by wave directions, while the motions of LNGC at the lee side are suppressed due to the shielding effect of FLNG. Relative motions between FLNG and LNGC tend to be amplified with the out-of-phase mode when two vessels oscillate in the opposed directions, induced by gap water resonances at high frequencies, while the mode of relative motions induced by roll resonance depends on wave directions and resonance frequencies.

Publication metadata

Author(s): Zhou K, Hu Z, Zhao D, Wan D, Meng X

Publication type: Article

Publication status: Published

Journal: Journal of Waterway, Portal, Coastal and Ocean Engineering

Year: 2018

Volume: 144

Issue: 4

Print publication date: 01/07/2018

Online publication date: 26/04/2018

Acceptance date: 01/02/2018

Date deposited: 04/02/2018

ISSN (print): 0733-950X

ISSN (electronic): 1943-5460

Publisher: ASCE


DOI: 10.1061/(ASCE)WW.1943-5460.0000457


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