Study on Transient Gap Resonance with Consideration of the Motion of Floating Body

• Published in: China ocean engineering Vol. 36; no. 6; pp. 994 - 1006
• Main Authors: Gao, Jun-liang, Lyu, Jing, Wang, Jing-hua, Zhang, Jian, Liu, Qian, Zang, Jun, Zou, Tao
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2022; Springer Nature B.V; Key Laboratory of Port,Waterway and Sedimentation Engineering of MOT,Nanjing Hydraulic Research Institute,Nanjing 210029,China%School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China%Department of Civil and Environmental Engineering,the Hong Kong Polytechnic University,Hong Kong,China%Centre for Infrastructure,Geotechnical and Water Engineering(IGWE),Department of Architecture and Civil Engineering,University of Bath,BA2 7AY,U.K%Shandong Provincial Key Laboratory of Ocean Engineering,Qingdao 266100,China; School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China
• Subjects: Amplification; Amplitude; Amplitudes; Boxes; Coastal Sciences; Computational fluid dynamics; Engineering; Floating bodies; Fluid dynamics; Fluid- and Aerodynamics; Free surfaces; Hydrodynamics; Loads (forces); Marine & Freshwater Sciences; Movement; Numerical and Computational Physics; Oceanography; Offshore Engineering; Original Paper; Peak periods; Resonance; Simulation; Vertical loads; Wave amplitude; Wave forces; Weather; OpenFOAM; wave loads; transient gap resonance; free-surface amplification; heave motion; focused waves
• ISSN: 0890-5487; 2191-8945
• DOI: 10.1007/s13344-022-0087-7

In this paper, the transient fluid resonance phenomenon inside a narrow gap between two adjacent boxes excited by the incident focused waves with various spectral peak periods and focused wave amplitudes is simulated by utilizing the open-sourced computational fluid dynamics software, OpenFOAM. The weather-side box is allowed to heave freely under the action of waves, and the lee-side box keeps fixed. This paper mainly focuses on how both the spectral peak period and the focused wave amplitude affect the free-surface amplification inside the gap, the motion of the weather-side box, and the wave loads (including the vertical and the horizontal wave forces) acting on both boxes. For comparison, another two-box system with both boxes fixed is also considered as a control group. It is found that the motion of the weather-side box significantly changes the characteristics of the transient gap resonance, and it would cause that the fluid resonant period becomes 1.4–1.6 times that of the two-box system with both boxes fixed. All the concerned physical quantities (i.e., the free-surface amplification in the gap, the motion of the weather-side box, the wave loads) are found to closely depend on both the spectral peak period and the focused wave amplitude.