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Investigation on Effects of Vertical Degree of Freedom on Gap Resonance Between Two Side-by-Side Boxes Under Wave Actions

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Abstract

The possible wave resonance in the narrow gap formed by the parallel arrangement of ships will lead to the sharp increase of wave loads and the rapid growth of motion response. The fluid resonance inside a narrow gap between two side-by-side boxes is investigated numerically based on an open-source CFD package, OpenFOAM. The upstream box remains fixed, while the downstream box is allowed to heave freely under wave actions. This work aims to examine the influence of the motion of the downstream box on the fluid resonant behaviors inside the gap. The hydrodynamic behaviors considered include the wave height inside the gap, the heave displacement, and the reflection, transmission, and energy loss coefficients. Gao et al. (2021) reported the influence of the motion of the upstream box on gap resonant behaviors. For comparative study, some results of Gao et al. (2021) are also presented in this work. It is found that the heave motion of any box in the two-box system leads to a smaller resonant wave height amplification and a larger fluid resonance frequency. The frequency at which the maximum heave displacement of the downstream box occurs is less than the fluid resonant frequency. The heave motion of any box in the two-box system results in a larger reflection coefficient and a smaller energy loss coefficient.

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Funding

This research is financially supported by the National Natural Science Foundation of China (Grant Nos. 51911530205 and 51809039), the Natural Science Foundation of Jiangsu Province (Grant No. BK20201455), the Natural Science Foundation of the Jiangsu Higher Education Institutions (Grant No. 20KJD170005) and the Qing Lan Project of Jiangsu Universities. The work is also partially supported by UK EPSRC (Grant No. EP/T026782/1), the Royal Academy of Engineering (Grant No. UK-CIAPP/73), and the Royal Society (Grant No. IEC\NSFC\181321)..

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Authors and Affiliations

  1. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212100, China

    Zhi-wei He, Jun-liang Gao & Qian Liu

  2. State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering, University of Macau, Macao, 999078, China

    Jun-liang Gao & Hua-bin Shi

  3. Centre for Infrastructure, Geotechnical and Water Engineering (IGWE), Department of Architecture and Civil Engineering, University of Bath, BA2 7AY, Bath, UK

    Jun Zang

  4. School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin, 132012, China

    Hong-zhou Chen

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  1. Zhi-wei He
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  2. Jun-liang Gao
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  3. Hua-bin Shi
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  4. Jun Zang
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  5. Hong-zhou Chen
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  6. Qian Liu
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Correspondence to Jun-liang Gao.

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He, Zw., Gao, Jl., Shi, Hb. et al. Investigation on Effects of Vertical Degree of Freedom on Gap Resonance Between Two Side-by-Side Boxes Under Wave Actions. China Ocean Eng 36, 403–412 (2022). https://doi.org/10.1007/s13344-022-0036-5

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  • DOI: https://doi.org/10.1007/s13344-022-0036-5

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