CFD-based Hull Form Multi-objective Optimization for Better Resistance and Wake Performances

In this paper, a ship model is used as the parent ship, and the optimization of the whole ship at a specific speed (Fr=0.26) is carried out aiming at the resistance performance and the wake performance. A RANS-based CFD solver naoe-FOAM-SJTU and a practical hydrodynamic optimization tool OPTShipSJTU are applied for the hull form optimization. Here, the free-form deformation method and shifting method are used as parametric hull surface modification techniques in order to generate a series of hull forms subjected to geometric constraints, and a multi-objective genetic algorithm, which is NSGA-II, is adopted to obtain the Pareto-optimal front. Moreover, to reduce the computational cost, the Kriging model which is constructed based on several sample designs is introduced. Finally, the optimal hull form can be obtained to be the reference of the hull form design, and the numerical results further prove the availability and reliability of the optimization tool, OPTShip-SJTU.