ABSTRAKT

Within the framework of linear water wave theory, the radiation of water waves by a hollow circular cylinder in an infinite depth ocean is considered. The whole fluid domain is divided into two regions: interior and exterior regions. Using separation of variables technique, Fourier sine transform and Havelock's expansion theorem, the radiated potentials in each region are obtained, and consequently the added mass, the damping coefficients and phase angles are evaluated for different wavenumbers and different drafts of the cylinder. It is observed that mostly the added mass are significant only at lower frequencies while the damping coefficients attain higher values in the middle range of frequencies. The added mass almost vanish at higher frequencies. All the results are depicted graphically.