buoyancy force
3.The hydrodynamic coefficient used in the calculation of Froude-Krylov force, diffraction force and radiation force changes instantaneously following the draft, and the hydrostatic buoyancy is computed very accurately for the instantaneous immerse hull. At last ,the ship motion equations are performed numerically with the fourth-order Runge-Kutta scheme in time domain,and sea loads are computed at the same time.
