Harmonic Analyses of Hydrodynamic Characteristics for Gap Resonance Between Fixed Box and Vertical Wall

Zhi wei He, Jun liang Gao, Hong zhou Chen, Jun Zang, Qian Liu, Gang Wang

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14 Citations (SciVal)
30 Downloads (Pure)

Abstract

Two marine structures arranged side by side with a narrow gap may suffer from violent free-surface resonance, which would cause green water on deck, dramatically raise hydrodynamic loads on structures and seriously threaten the operation safety. The CFD-based open-sourced software, OpenFOAM®, is employed to simulate the two-dimensional fluid resonance inside a narrow gap between a fixed box and a vertical wall induced by regular waves with different wave heights. The topographies with various plane slopes are placed in front of the wall. The focus of this article is on the influences of the incident wave height and the topographic slope on the nonlinear characteristics of various hydrodynamic parameters (including the wave height in the gap, the vertical wave force, and the horizontal wave force on the box) during gap resonance. The ratios of their high-order to the corresponding 1st-order components under different sets of the incident wave height and the topographic slope are analyzed. It is found that the relative importance of all the high-order components increases gradually with the incident wave height for all the three parameters. The topographic influence on them closely depends on the type of the parameters and the incident wave height. In addition, the occurrence of the 2nd-order gap resonance phenomenon can cause the 2nd-order wave height and horizontal force to be significantly larger than the corresponding 1st-order components.

Original languageEnglish
Pages (from-to)712-723
Number of pages12
JournalChina Ocean Engineering
Volume35
Issue number5
DOIs
Publication statusPublished - 19 Nov 2021

Bibliographical note

Funding Information:
This research is financially supported by the National Key Research and Development Program of China (Grant No. 2017YFC1404200), the National Natural Science Foundation of China (Grant Nos. 51911530205 and 51809039), the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20201455 and BK20210885), 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).

Keywords

  • gap resonance
  • harmonic analyses
  • OpenFOAM®
  • resonant wave height
  • wave loads

ASJC Scopus subject areas

  • Oceanography
  • Renewable Energy, Sustainability and the Environment
  • Ocean Engineering
  • Mechanical Engineering

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