In the present paper the hydrodynamic analysis of a floating, freesurfacepiercing, porous cylindrical body with vertical axis ofsymmetry is presented. Linear potential theory is assumed, and theassociated diffraction and radiation problems are solved in thefrequency domain. Analytical representations of the velocity potentialare derived through the idealization of the flow field around the bodyusing ring shaped fluid regions. The condition on the porous boundaryis defined by applying the Darcy’s law, whereas the fluid velocity andits derivatives are matched at the common boundaries of adjacent fluiddomains by enforcing appropriate continuity conditions. Thetheoretical hydrodynamic approach is supplemented by numerousresults comparing the hydrodynamic forces and free-surface elevationat a porous cylindrical body with the corresponding ones on animpermeable solid. The presented results demonstrate that a poroussurface can reduce the hydrodynamic loads on the body enhancing itssurvivability on severe wave conditions.
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