Numerical simulation analysis of bucket foundations platform submergence

Bucket foundations platform is subjected to the complicated first order and second order hydrodynamic force in the stage of submergence. To know the character of the platform motion response, a numerical model of platform was set up, first order and second order hydrodynamic forces were calculated by Green function and pressure integral of the wet surface, and coupling-motion equations of platform and mooring lines were solved. An experiment was made in the State Key Lab. of Ocean Engineering of Shanghai Jiaotong University to verify the simulation. The results of simulation agree well with the results of experiment. It can be drawn from the numerical simulation that the main motion directions are surge, sway, pitch and roll, which relate to the wave heading; the second order wave force has obvious action on surge and sway; the stage of self-ballast submergence is stable and practical.