Effects of free heave motion on wave resonance inside a narrow gap between two boxes under wave actions

OCEAN ENGINEERING

卷:224

Article

Gao, Junliang^1,2  He, Zhiwei¹  Huang, Xianghong³  Liu, Qian¹  Zang, Jun²  Wang, Gang⁴ 

[1] Jiangsu Univ Sci & Technol, Sch Naval Architecture & Ocean Engn, Zhenjiang 212100, Jiangsu, Peoples R China

[2] Univ Bath, Dept Architecture & Civil Engn, Res Unit Water Environm & Infrastruct Resilience, Bath BA2 7AY, Avon, England

[3] Harbin Engn Univ, Coll Shipbldg Engn, Harbin 150001, Peoples R China

[4] Hohai Univ, Coll Harbour Coastal & Offshore Engn, Nanjing 210098, Peoples R China

关键词: Gap resonance;    Wave height amplification;    Heave motion;    Harmonic analysis;    OpenFOAM;   

DOI  :  10.1016/j.oceaneng.2021.108753

来源: Elsevier

【 摘 要 】

Fluid resonance inside a narrow gap between two side-by-side boxes is investigated based on an open-source CFD package, OpenFOAM. An upstream box heaves freely under wave actions and a downstream box remains fixed. The focus of this work is to study the influence of the motion of the upstream box on the hydrodynamic behavior of the resonant fluid inside the gap. The hydrodynamic behavior considered in this study includes the wave height inside the gap, heave displacement and their harmonic components, and reflection, transmission and energy loss coefficients. For comparison, the configuration in which the two boxes are fixed is considered. It was found that the heave motion of the upstream box increases the fluid resonant frequency and significantly reduces the resonant wave height in the gap. The frequencies at which the maximum and minimum heave displacements of the upstream box are observed to obviously deviate from the fluid resonant frequency. For the wave height in the gap and heave displacement, the effects of the incident wave height on their harmonic components are different. The heave motion of the upstream box results in a larger reflection coefficient and smaller energy loss coefficient.

【 授权许可】

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