Numerical simulations of a twin-square marine structure with different submerged depths and gap ratios in waves. (15th December 2022)

• Record Type: Journal Article
• Authors: Deng, Xiaokang; Xie, Wenhui; Guo, Jianting; Wu, Xu; Li, Yancheng
• Is Part Of: Ocean engineering. Volume 266(2022) Part 1
• Publication Date: 2022-12-15
• Subjects: Wave-structure interactions -- A twin-square structure -- k-ω SST -- Wave forces -- Submerged depth -- Gap ratio; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2022.112716
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: The wave-structure interactions for a twin-square structure with different submerged depths and gap ratios are investigated using a 2D numerical tank based on the Unsteady Reynolds-averaged Navier-Stokes equations with the k − ω SST turbulence model. The volume of fluid method is employed to capture the characteristics of the free surface. The wave past a horizontal circular structure is simulated to validate the present numerical model by comparing the numerical results with the experimental data measured by Dixon et al. (1979). Then, the hydrodynamic characteristics of a twin-square structure in waves are investigated using the validated numerical model, including wave forces, free surface elevations and vortex structures. The influences of the twin-square structure' submerged depth and gap ratio on its hydrodynamic characteristics are studied. The numerical results show that both submerged depth and gap ratio have significant influences on the wave forces acting on and the flow field around the structure. The structure is easily subjected to the wave impact loads when it is located above the still water level. When the gap ratio is less than 0.6, the vertical wave forces on the structure decrease with the increase of the gap ratio. The influence of the gap ratio is considered to be negligible when the gap ratio is larger than 0.6. Highlights: The wave-structure interactions for a twin-square structure are investigated. The wave past a horizontal circular structure is simulated to validate the present numerical model. The influences of the twin-square structure' submerged depth and gap ratio on its hydrodynamic characteristics are studied. Both submerged depth and gap ratio have significant influences on the wave forces on and the flow field around the structure.