Optimization of a Wing-Sail shape for a small boat

G. Lombardi, F. Cartoni, M. Maganzi (University of Pisa)

CHALLENGE - This project is the realization of a wing-sail to be used on a boat that will participate in the next edition of the 1001 Vele. 1001 Vele is a sailing competition of boats designed and built by different universities. The class rules define length, sail plan surface and other boat characteristics. The challenge is to design and optimize the rigid wing-sail profile using high accuracy CFD simulations.

SOLUTION - The optimization is divided in two steps. In the first step the 2D airfoil shape is optimized at different spanwise sections. Then, the results obtained are fixed and used to create a parametric 3D wing geometrymodeFRONTIER has been used in both steps to create an automatic workflow integrating MATLAB, to create the airfoil profiles, CATIA, to generate the geometry and Star CCM+, to perform the CFD simulations. The 2D optimization takes into account 14 geometrical input variables of both the front and the rear wing and computes the values of lift and drag. The sail geometry optimization is done considering height and chord distribution with a fixed airfoil geometry. The objective is to maximize thrust with constrained values of roll moment and plan surface.










BENEFITS - In this study presented, modeFRONTIER has been used to optimize the sail plan of a competition boat. A two-step optimization process enables to find the best airfoil shape and geometry of the sail plan. The goal is the optimization of shape and the configuration of the airfoils at any spanwise section, at a fixed value of the Cl coefficient, Cd coefficient is minimized, respecting a series of geometrical, structural, technological and regulatory constraints.