Abstract
Abstract In offshore oil and gas exploration and transportation, it is often encountered that the multi-floating structures work side by side. In some sea conditions, there is a strong coupling between the multi-floating structures that seriously affects the safety of offshore operations. Therefore, the prediction of the relative motion and force between the multi-floating structures and the wave elevation around the multi-floating-system has become a hot issue. At present, the problem of double-floating-system is mostly based on linear potential flow theory. However, when the gap width between two floating bodies is small, the viscous and nonlinear effects are not negligible, so the potential flow theory has great limitations. Based on the viscous flow theory, using the finite difference solution program of FLOW3D and using volume of fluid technology to capture the free surface, a three-dimensional numerical wave basin is established, and the numerical results of the wave are compared with the theoretical solution. On this basis, the hydrodynamic model of side-by-side double-floating-system with a narrow gap is established, and the flow field in the narrow gap of the fixed double-floating-system under the regular wave is analyzed in detail. The law of the gap-resonance is studied, which provides valuable reference for the future research on the multi-floating-system.
Highlights
In recent years, with the further development and utilization of marine resources, multi-floating-system has been widely used in production practice [1,2,3,4]
When the incident wave reaches the resonant period of the double-floating-system, the wave continuously reflects in the narrow gap, and the fluid in the narrow gap produces convection with the fluid at the bottom of the floating body, and the free surface in the narrow gap will rise significantly
(2) It can be seen from the color contour plot of free surface at different gap width that as the narrow gap width increases, the resonant period of the flow field in the narrow gap of double-floating-system increases
Summary
With the further development and utilization of marine resources, multi-floating-system has been widely used in production practice [1,2,3,4]. There are two main methods for hydrodynamic interference research in the narrow gap of multiple-floating-system: (1) numerical simulation based on linear potential flow theory and (2) model test. The researchers found the importance of viscosity and nonlinearity and tried to refine the results of the linear potential flow theory by the damping lid method, but it must depend on the study of the test and difficult to give a pervasive damping value. (2) Based on the Flow3D finite difference solution program of viscous flow theory, a three-dimensional numerical wave basin is established to simulate the hydrodynamic resonance phenomenon in the narrow gap of the double-floating-system under the action of the wave, and the calculation results are compared with the results of the literature [23,24,25]. (4) The influence of narrow gap width and wave period on the wave elevation is analyzed in detail
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