Water motion characteristics and water damping correction in gap  between ship-to-ship system

LIU Liqin; MENG Chunlei; SHEN Wenjun; LIU Yilun; ZHANG Ruoyu

doi:10.19693/j.issn.1673-3185.02719

Volume 18 Issue 3

Jun. 2023

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Chinese Journal of Ship Research > 2023 > 18(3): 129-138. > DOI: 10.19693/j.issn.1673-3185.02719 CSTR: 32390.14.j.issn.1673-3185.02719

LIU L Q, MENG C L, SHEN W J, et al. Water motion characteristics and water damping correction in gap between ship-to-ship system[J]. Chinese Journal of Ship Research, 2023, 18(3): 129–138. DOI: 10.19693/j.issn.1673-3185.02719

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Water motion characteristics and water damping correction in gap between ship-to-ship system

1.
Stake Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
2.
Yantai Office, China Classification Society, Yantai 264000, China
3.
Key Laboratory of Engineering Sediment of Ministry Communications, Tianjin Research Institute for Water Transport Engineering, Tianjin 300456, China

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Received Date: December 21, 2021
Revised Date: April 28, 2022
Available Online: May 31, 2022

This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract

Objectives This study seeks to correct the distortion of results caused by the inviscid-flow assumption when potential flow theory is used to calculate a two-ship floating system with a small gap, and analyze the motion response characteristics of the gap water.
Methods A CFD numerical model of a ship-to-ship transfer system is established and the water response characteristics and mechanism in the gap are analyzed. The CFD calculation results are then compared with those of potential flow theory in order to obtain the accurate damping coefficient of the two-ship gap and correct the results of potential flow theory.
Results The results show that the trend of wave elevation is different when waves of different frequencies pass through the gap. For low frequency waves, the incident wave cannot pass through the gap between the two ships, so the gap wave elevation is smaller than the wave amplitude of the incident wave. For high frequency waves, the incident wave can pass through the gap, so the gap wave elevation is greater than the wave amplitude of the incident wave. There is a high-speed area in the gap between the two ships which decreases the hydrodynamic pressure on the inner sides of the two vessels, resulting in greater suction which may adversely affect transfer operations.
Conclusions The correction method proposed herein can obtain the damping coefficient of gap water more accurately, providing guidance for the high-precision and rapid hydrodynamic and motion calculation of ship-to-ship transfer systems.
- ship-to-ship transfer system,
- gap water motion,
- gap water damping,
- hydrodynamic model correction

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