Computation of Added Wave Resistance of a Restrained Floating Body in the Time-Domain

Abstract

The time-domain analysis is applied to study the added resistance of a restrained floating body moving with a steady forward speed in waves. It is treated as an initial-boundary value problem and solved by the time-domain Green function method. The body boundary condition is satisfied exactly on each instantaneous wetted body surface, and the linearized free surface condition is applied. The added resistance computation is carried out by integrating pressures on the wetted body surface. A submerged spheroid and a surface-piercing vertical circular cylinder are selected as numerical examples. Good agreements are obtained by comparing with the transformed results from the frequency-domain computation. Wave exciting force on Series 60 C_B=0.7 is also computed to verify the computational method.