Comparison of the ship motions and added resistance of a medium sized RoPax ferry using potential flow software and RANSE simulations

The present paper reports the comparison of the ship motions and added resistance assessment using high fidelity RANSE simulations in virtual towing tank LincoSim and ShipX seakeeping potential flow software for a medium sized RoPax ferry of Levante Ferries fleet, which operates daily routes in Ionian sea. Calculations by ShipX are done by strip theory by Salvesen et al (1970), direct pressure integration and time domain. The high fidelity RANSE seakeeping modelling based on the open-source CFD code OpenFOAM using a standardized framework, and tailored to take advantage of HPC facilities is based on a forcing zone formulation, after Peric et al. (2020). The seakeeping simulations are performed for six wave periods in head and beam seas at the constant wave height of 3m. Seakeeping analyses of obtained results using high fidelity RANSE modelling have shown to overcome well-known limitations of low-fidelity methods for roll resonance, added resistance and analysis in extreme waves.