Avaliação direta dos fenômenos de surf-riding e guinada brusca de um navio patrulha por meio de um modelo unificado de manobra e seakeeping

Abstract

This dissertation focused on the direct evaluation of the surf-riding phenomenon, one of the five failure modes considered by the second-generation intact stability criteria (SGISC) of the IMO. To achieve this, a unified numerical model of maneuverability and seakeeping was developed, integrating simultaneously the hydrodynamic forces associated with maneuvering and those resulting from wave interaction. The modeling was carried out using the ANSYS AQWA software. Propulsion, resistance, rudder, and maneuvering forces were incorporated into the simulation through an external forces routine. The resistance and propulsion forces were modeled based on experimental tests results, while the rudder and maneuvering forces were estimated using empirical models, with maneuvering coefficients calibrated from scaled model tests. Simulations were conducted for following waves in the region identified by the IMO's Level 2 criteria as susceptible to surf-riding. The results allowed for the identification of the forces that lead to the phenomenon and indicate that, up to a certain wave height, the numerical model is compatible with IMO’s Level 2 vulnerability prediction.