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Effects of Free Heave Motion on Wave Forces on Two Side-by-Side Boxes in Close Proximity Under Wave Actions

Abstract

Wave forces on two side-by-side boxes in close proximity under wave actions were analyzed using the OpenFOAM package. The upstream box heaved freely under wave actions, whereas the downstream box remained fixed. For comparison, a configuration in which both boxes were fixed was also considered. The effects of the heave motion of the upstream box on the wave loads, including the horizontal wave forces, vertical wave forces, and moments on the boxes, were the focus of this study. Numerical analyses showed that all frequencies at which the maximum horizontal wave forces, maximum vertical wave forces, and maximum moment appeared are dependent on the heave motion of the upstream box and that the effects of the heave motion on these frequencies are different. Furthermore, these frequencies were observed to deviate from the corresponding fluid resonant frequency. Moreover, the heave motion of the upstream box reduced the wave forces acting on both boxes and altered the variation trends of the wave forces with the incident wave frequency.

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Correspondence to Jun-liang Gao.

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Foundation item

This research is financially supported by the National Key Research and Development Program (Grant No. 2017YFC1404200), 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. This 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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Cite this article

He, Zw., Gao, Jl., Zang, J. et al. Effects of Free Heave Motion on Wave Forces on Two Side-by-Side Boxes in Close Proximity Under Wave Actions. China Ocean Eng 35, 490–503 (2021). https://doi.org/10.1007/s13344-021-0045-9

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Key words

  • fluid resonance
  • wave forces
  • narrow gap
  • heave motion
  • OpenFOAM