HYDRODYNAMIC COEFFICIENTS FOR A THICK-WALLED BOTTOMLESS CYLINDRICAL BODY FLOATING IN WATER OF FINITE DEPTH

The paper deals with the linearized hydrodynamic forces acting on a thick-walled bottomless cylindrical body having vertical symmetry axis and oscillating in water of finite depth. For the solution of the radiation problem, the flow field around the structure is subdivided into ring-shaped fluid regions, in each of which an axisymmetric eigenfunction expansion for the velocity potential is made. By implementing Galerkin's method the various potential solutions are then matched and numerical results concerning the hydrodynamic coefficients for heave, surge and pitch motions, as well as the coupling terms between the last two modes are obtained.