Hydrodynamic Design Procedure via Multi-Objective Sampling, Metamodeling, and Optimisation

A hydrodynamic design procedure is presented, combining multi-objective sampling, metamodeling, and optimisation. A design study of a flapped surface for a passenger hydrofoil is discussed. Hydrodynamics, stability and control are optimised with focus on maximum lift, minimum drag, and manoeuvrability/stability performance during take-off and turning manoeuvres. Shape optimisation and control design are applied in combination with validated CFD simulations. Specifically, the hydrodynamic design of the foil sections is achieved though optimisation, combining automatic shape/grid modification, adaptive sampling and metamodeling, and multi-objective optimisation algorithms for maximum lift and minimum drag. A robust control scheme is designed for the optimised shape. Flaps and rudders are commanded to stabilize roll and pitch motions, as well as steering the vessel during the desired manoeuvres.