Flexible hydrofoil optimization for the 35th America's cup with constrained Ego Method - Laboratoire Interdisciplinaire des Sciences du Numérique Accéder directement au contenu
Communication Dans Un Congrès Année : 2017

Flexible hydrofoil optimization for the 35th America's cup with constrained Ego Method

Résumé

This paper investigates the use of constrained surrogate models to solve the multi-design optimization problem of a flexible hydrofoil. The surrogate-based optimization (EGO) substitutes the complex objective function of the problem by an easily evaluable model, constructed from a limited number of computations at carefully selected design points. Associated with ad-hoc statistical strategies to propose optimum candidates within the estimated feasible domain, EGO enables the resolution of complex optimization problems. In this work, we rely on Gaussian processes (GP) to model the objective function and adopt a probabilistic classification method to treat non-explicit inequality constraints and non-explicit representation of the feasible domain. This procedure is applied to the design of the shape and the elastic characteristics of a hydrofoil equipped with deformable elements providing flexibility to the trailing edge. The optimization concerns the minimization of the hydrofoil drag while ensuring a non-cavitating flow, at selected sailing conditions (boat speed and lifting force). The drag value and cavitation criterion are determined by solving a two-dimensional nonlinear fluid-structure interaction problem, based on a static vortex lattice method with viscous boundary layer equations, for the flow, and a nonlinear elasticity solver for the deformations of the elastic components of the foil. We compare the optimized flexible hydrofoil with a rigid foil geometrically optimized for the same sailing conditions. This comparison highlights the hydrodynamical advantages brought by the flexibility: a reduction of the drag over a large range of boat speeds, less susceptibility to cavitation and a smaller angle of attack tuning range.
Fichier principal
Vignette du fichier
20-Sacher_flexible_foil_optimisation.pdf (1.42 Mo) Télécharger le fichier
Origine : Accord explicite pour ce dépôt
Loading...

Dates et versions

hal-01583591 , version 1 (07-09-2017)

Identifiants

  • HAL Id : hal-01583591 , version 1

Citer

Matthieu Sacher, Matthieu Durand, Elisa Berrini, Frédéric Hauville, Régis Duvigneau, et al.. Flexible hydrofoil optimization for the 35th America's cup with constrained Ego Method. INNOVSAIL International Conference on Innovation in High Performance Sailing Yachts, CVET and Ecole Navale, Jun 2017, Lorient, France. pp.193-205. ⟨hal-01583591⟩
551 Consultations
1200 Téléchargements

Partager

Gmail Facebook X LinkedIn More