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Dynamic Behaviour of a Flexible Yacht Sail Plan

Article dans une revue avec comité de lecture
Author
AUGIER, Benoit
ccBOT, Patrick
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
ccHAUVILLE, Frederic
DURAND, Mathieu

URI
http://hdl.handle.net/10985/8689
DOI
10.1016/j.oceaneng.2013.03.017
Date
2013
Journal
Ocean Engineering

Abstract

A numerical investigation of the dynamic Fluid Structure Interaction (FSI) of a yacht sail plan submitted to harmonic pitching is presented to address both issues of aerodynamic unsteadiness and structural deformation. The FSI model | Vortex Lattice Method uid model and Finite Element structure model | has been validated with full-scale measurements. It is shown that the dynamic behaviour of a sail plan subject to yacht motion clearly deviates from the quasi-steady theory. The aerodynamic forces presented as a function of the instantaneous apparent wind angle show hysteresis loops, suggesting that some energy is exchanged by the system. The area included in the hysteresis loop increases with the motion reduced frequency and amplitude. Comparison of rigid versus soft structures shows that FSI increases the energy exchanged by the system and that the oscillations of aerodynamic forces are underestimated when the structure deformation is not considered. Dynamic loads in the fore and aft rigging wires are dominated by structural and inertial effects. This FSI model and the obtained results may be useful firstly for yacht design, and also in the field of auxiliary wind assisted ship propulsion, or to investigate other marine soft structures.

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