NUMERICAL ANALYSIS OF WAVE-STRUCTURE DYNAMIC INTERACTION CAUSED BY DIFFERENT GEOMETRIES OF GRAVITY PLATFORMS

Given that the gravity platforms are supported by the sea bed but not attached to the ground, the motion of them is known as a rocking fluctuation. During thefluctuations, the platform maybe overturned if the angle is large. In this study, using Ansys Aqwa hydrodynamic software and analytical methods with regard to the performance, the dynamic interaction of platform’s geometry on hydrodynamic forces have been simulated. The objective of this study was to analyze the hydrodynamic parameters of the sea and rocking fluctuations of gravity platforms under the impact of regular wave’s moment considering the soil mechanics and hydrodynamic features of the structure. In order to achieve the objective the hydrodynamic forces using numerical simulations and analytical methods[7] of Mac Cami[3] foch and Chakrabarty[6]for monopod and tripod platforms were analyzed. Finally, responses of the platform to irregular waves were studied using numerical simulation.