Hydrodynamic Performance Optimization for Luxury Cruise Ship Considering Ducktail Deformation

Based on the self-developed OPTShip-SJTU optimization software, this paper presents a comprehensive optimization and analysis of the total resistance coefficient, non-dimensional pitch and heave of a domestic VISTA luxury cruise ship sailing in waves by changing the ducktail profile. Free-form deformation, optimal Latin hypercube sampling method, computational fluid dynamics, Kriging approximation model and non-dominated sorting genetic algorithm (NSGA-II) were used in the optimization to obtain the Pareto-optimal solution set. Four optimized ducktails were selected for numerical simulation and validation. With the forward contraction of both sides of the ducktail and the backward extension in the middle, the total resistance coefficient, non-dimensional pitch and heave of the cruise ship can be optimized simultaneously. When the ducktail extends backward, the non-dimensional heave increases slightly, but the total resistance coefficient and the non-dimensional amplitude of pitch motion decrease, which has certain conflict between the optimization of heave and pitch. The method and procedure adopted in the study can be used in the hydrodynamic performance optimization of luxury cruise ships, and the conclusions can provide a reference to the optimization and design of the ducktail of cruise ships. © 2022, Editorial Office of Ship Building of China. All right reserved.