WAVE FORCES ACTING ON A SUBMERGED SPHERE UNDER REGULAR PROGRESSIVE WAVE

This paper aims to discuss the wave forces acting on a submerged sphere. Labolatory experiments were carried out to measure the wave forces and to investigate the flow conditions. The wave forces measured were decomposed into the drag and inertia forces using the Morison equation with engineering applications in mind. The maximum wave force, the applicable range of the Morison equation and the drag and inertia coefficients are mainly discussed in relation to the flow condition. The flow patterns can be classified into four types, such as the oscillating types with and without flow separation and rotating ones with and without flow separation. These flow types characterize well the wave forces. The drag and inertia coefficients, in the applicable range of the Morison equation, are given graphically as a function of the K. C. number, d/h and h/gT2.