How does sailor morphology affect Olympic windfoil performance?
Résumé
The Olympic windfoiling class consists of a windsurfing board that flies above the water with a hydrofoil. The sail is held by the sailor whose weight and position are key in the balance with aerodynamic and hydrodynamic forces. Therefore, understanding performance relative to sailor morphology is crucial. Windfoil performance is complex to model due to factors like aero-hydrodynamics, cavitation [1], and/or free surface effects [2] and fluid-structure interactions [3]. To assess the performance of a windfoil, the use of a Velocity Prediction Program (VPP) is a conventional approach [4] for sailing boats. This work presents the development of a 5DOF VPP tailored to windfoiling, optimizing sail angle, sailor position, and kinematic orientation. A simplified biomechanical model of the sailor is included to evaluate the impact of the sailor’s morphology on performance. The numerical flow model uses the Vortex Lattice Method (VLM), without considering structural effects, to minimize calculation costs. The results show that the VPP converges to different optimal positions and orientations for sailors with different morphologies. This work is part of the project ”Du Carbone à l’Or Olympique” and is funded by the Agence Nationale de La Recherche (ANR) through grant n°ANR-19- STHP-0002.
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