The occurrence of negative added mass in free-surface problems involving submerged oscillating bodies

SummaryThe phenomenon of negative added mass is studied by considering the heave oscillations of a submerged vertical cylinder. Free-surface effects are shown to be important for the occurrence of negative added mass. Rapid changes in the added mass and damping, as functions of frequency of oscillation, often associated with this phenomenon are explained in terms of near-resonant standing waves above the body.