Ship motion responses in cross wave and related safe navigation strategy

doi:10.3785/j.issn.1008-973X.2021.08.008

Journal of ZheJiang University (Engineering Science)

2021, Vol. 55

Issue (8): 1473-1481 DOI: 10.3785/j.issn.1008-973X.2021.08.008

Ship motion responses in cross wave and related safe navigation strategy

Song-xing HUANG(

),Jia-long JIAO*(

),Chao-he CHEN

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China

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Abstract

A cross wave simulation method by computational fluid dynamics (CFD) method and volumn of fluid (VOF) wave-making technique was established to study the difference of ship motion responses in multi-directional and uni-directional waves. The momentum source method and wave forcing were used to superimpose waves to simulate cross wave. The motion behavior of a S175 ship in cross waves with different wave parameters was studied using overset mesh technique and dynamic fluid body interaction (DFBI) module. The ship motion responses in bi- and uni-directional waves were comparatively analyzed and the motion characteristics of ships on different navigational routes in a cross wave field were analyzed. Results indicate that the motion responses and green water on deck in bi-directional waves are generally much greater than those in uni-directional waves. And, the ship has obvious roll motion in cross waves. However, ship motions and green water on deck can be largely reduced by adopting the reasonably optimized navigational route and strategy, which would improve the navigation safety of the ship in cross waves and provide suggestions for the sailing safety when the ship encounters cross waves.

Key words： cross wave seakeeping large-amplitude motions green water on deck computational fluid dynamics (CFD)

Received: 29 July 2020 Published: 01 September 2021

CLC:

U 661.1

Fund: 国家自然科学基金资助项目（51909096）；中央军委装备发展部“十三五”装备预研领域基金资助项目（61402070106）；广东省基础与应用基础研究基金资助项目（2020A1515011181）

Corresponding Authors: Jia-long JIAO E-mail: 201820107670@mail.scut.edu.cn;jiaojl@scut.edu.cn

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Cite this article:

Song-xing HUANG,Jia-long JIAO,Chao-he CHEN. Ship motion responses in cross wave and related safe navigation strategy. Journal of ZheJiang University (Engineering Science), 2021, 55(8): 1473-1481.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.08.008 OR https://www.zjujournals.com/eng/Y2021/V55/I8/1473

方形波浪中船舶运动特性及安全航行策略

为了研究船舶在多向波与单向波中运动响应的差异性，基于计算流体动力学(CFD)方法和流体体积法（VOF）造波技术建立方形波浪的数值模拟方法. 采用动量源方法和强迫波力进行波浪叠加模拟方形波浪，采用重叠网格技术和动态流体物体相互作用（DFBI）模块研究S175船型在不同参数方形波浪中的运动响应，并将船舶在双向波浪和单向波浪中的运动响应进行对比分析，探究船舶在方形波浪场中不同航线下的运动特性. 研究表明，在大部分工况下，方形波浪中的船舶运动响应及甲板上浪较单向波浪中的大幅增加，其中船舶在方形波浪中出现明显的横摇运动，但合理选择航行路线可以使得船体运动及甲板上浪显著降低，从而提高船舶在方形波浪中的航行安全性, 为船舶遭遇方形波浪时的安全航行提供建议.

关键词： 方形波浪, 耐波性, 大幅运动, 甲板上浪, 计算流体动力学(CFD)

Fig.1 S175 hull model

Tab.1 Main properties and parameters of S175 model

Tab.2 Calculation conditions in unidirectional waves and bidirectional waves

Fig.2 Wave propagation headings relative to ship

Fig.3 Fluid domain and boundary conditions

Fig.4 Mesh generation of fluid domain

Fig.5 Overset mesh and surface mesh around hull

Fig.6 CFD simulated waves and wave gauge position

Fig.7 Initialized wave profile of uni-directional waves

Fig.8 Initialized wave profile of bi-directional waves

Fig.9 Wave elevation of encountered uni-directional waves

Fig.10 Wave elevation of encountered bi-directional waves

Fig.11 Frequency domain results of encountered bi-directional wave　　　

Fig.12 Ship motion in bi-directional waves

Fig.13 Comparison of longitudinal motion amplitude

Fig.14 Comparison of time series of ship longitudinal motion in symmetrical waves

Fig.15 Comparison of green water on deck

Fig.16 Comparison of time series of ship longitudinal motion in asymmetrical waves

Fig.17 Comparison of green water on deck

Fig.18 Three typical routes at −45°/45° heading angle

Fig.19 Time series of ship motion on different routes

Fig.20 ship motion and green water on deck


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