CFD Predictions, Towing Tank Tests, and Full-scale Sea-Trials for a Fast Monohull Optimized for Energy Efficiency

A fast monohull was optimized and constructed as a pilot boat within a comprehensive R&D project. The 11-meter vessel (36.3 ft), designed for 27.5 knots at 9.5 tons displacement, features tunneled propellers and conventional shaft lines. Parametric models were developed using CAESES®, and viscous free surface RANS simulations were performed with STAR-CCM+. The design was refined through a comprehensive design-of-experiment (DoE) covering 18 geometric parameters as free variables, resulting in about 100 high-fidelity CFD variants. Machine learning further enhanced optimization. Towing tank tests validated the numerical data. A full-scale prototype underwent sea-trials, including maneuvering. This study presents a systematic comparison between CFD, towing tank tests, and full-scale trials in calm-water, explaining the design process and highlighting design improvements for energy-efficiency.