Abstract
In the present paper the hydrodynamic analysis of a floating, freesurface piercing, porous cylindrical body with vertical axis of symmetry is presented. Linear potential theory is assumed, and the associated diffraction and radiation problems are solved in the frequency domain. Analytical representations of the velocity potential are derived through the idealization of the flow field around the body using ring shaped fluid regions. The condition on the porous boundary is defined by applying the Darcy’s law, whereas the fluid velocity and its derivatives are matched at the common boundaries of adjacent fluid domains by enforcing appropriate continuity conditions. The theoretical hydrodynamic approach is supplemented by numerous results comparing the hydrodynamic forces and free-surface elevation at a porous cylindrical body with the corresponding ones on an impermeable solid. The presented results demonstrate that a porous surface can reduce the hydrodynamic loads on the body enhancing its survivability on severe wave conditions.