EVALUATION OF EMPIRICAL AND NUMERICAL METHODS ON THE PREDICTION OF HYDRODYNAMIC LOADS INVOLVED IN THE PASSING SHIP PROBLEM

摘要

This article presents a brief description of a passing ship experiment conducted at the State of São Paulo Institute forrnTechnological Research (IPT) and a study concerning three methods of estimation/calculation of the hydrodynamicrnloads on a captive ship forces/moment induced by a passing ship advancing alongside with constant velocity and withoutrndrift angle. Results are presented comparing the experimental measurements with the predictions obtained by anrnempirical regression model, calculations obtained by a potential flow strip theory, that does not take into account thern“exact” ship geometry (only the ship sectional area curve), and the ones provided by a three-dimensional boundaryrnelements method (BEM) based on Rankine sources as Green function, which considers the geometry of the shiprncompletely. The analyses were performed with ships of similar displacements (Suezmax hull forms), considering threernspeed velocities, five separation distances and two drafts of the passing ship in order to evaluate the effects of the shiprngoing for and coming from an offloading operation.