Numerical analysis of hydrodynamic characteristics in mooring platforms with diverse moonpool shapes using SPH

The hydrodynamic characteristics of offshore floating platforms can be significantly influenced by the presence of moonpools, particularly when considering the various shapes, which are often overlooked in existing research. Therefore, this work utilizes SPH to explore the hydrodynamic characteristics of floating mooring platforms with different moonpool shapes. A coupled approach by integrating the open-source platform DualSPHysics and MoorDyn is employed to model wave interactions and mooring platform dynamics. The employed coupled model is validated by three-dimensional flume experimental results. The results demonstrate the model's ability to accurately simulate wave generation across various scales and the resulting motion response of floating bodies driven by fluid forces. Furthermore, this work specifically focuses on the three-DOF motion responses of five different platforms, considering the presence or absence of moonpools in mooring conditions. Additionally, the mooring analysis for various platform types is being examined. Moreover, the hydrodynamic influence mechanism of incident waves on the platform model is investigated. The findings demonstrate that as the length of the moonpool in the wave direction increases, the surge amplitude of the platform increases and the heave amplitude decreases. When subjected to regular waves, the platform equipped with a moonpool exhibits an overall enhancement in motion response.