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Numerical study of a flexible sail plan : effect of pitching decomposition and adjustments

Communication avec acte
Auteur
AUGIER, Benoit
DEPARDAY, Julien
DURAND, Mathieu
233702 K-Epsilon
ccBOT, Patrick
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
ccHAUVILLE, Frederic

URI
http://hdl.handle.net/10985/14918
Date
2013

Résumé

A numerical investigation of the dynamic Fluid Structure Interaction (FSI) of a yacht sail plan submitted to harmonic pitching is presented to analyse the effects of motion simplifications and rigging adjustments on aerodynamic forces. 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. These hysteresis phenomena do not result from a simple phase shift between forces and motion. Plotting the hysteresis loops in the appropriate coordinate system enables the associated energy to be determined. This amount of exchanged energy is shown to increase almost linearly with the pitching reduced frequency and to increase almost quadratically with the pitching amplitude in the investigated ranges. The effect of reducing the real pitching motion to a simpler surge motion is investigated. Results show significant discrepancies on the aerodynamic forces amplitude and the hysteresis phenomenon between pitching and surge motion. However, the superposition assumption consisting in a decomposition of the surge into two translations normal and collinear to the apparent wind is verified. Then, simulations with different dock tunes and backstay loads highlight the importance of rig adjustments on the aerodynamic forces and the dynamic behaviour of a sail plan.

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IRENAV_INNOVSAIL_15_2013_.pdf
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  • Institut de Recherche de l’École navale (IRENAV)

Documents liés

Visualiser des documents liés par titre, auteur, créateur et sujet.

  • Modal Analysis of Pressures on a Full-Scale Spinnaker 
    Communication avec acte
    DEPARDAY, Julien; AUGIER, Benoit; RABAUD, Marc; MOTTA, Dario; LE PELLEY, David; ccBOT, Patrick; ccHAUVILLE, Frederic (2016)
    While sailing offwind, the trimmer typically adjusts the downwind sail "on the verge of luffing", letting occasionally the luff of the sail flapping. Due to the unsteadiness of the spinnaker itself, maintaining the luff ...
  • Full-scale flying shape measurement of offwind yacht sails with photogrammetry 
    Article dans une revue avec comité de lecture
    DEPARDAY, Julien; ccBOT, Patrick; ccHAUVILLE, Frederic; AUGIER, Benoit; RABAUD, Marc (Elsevier, 2016)
    Yacht downwind sails are complex to study due to their non-developable shape with high camber and massively detached flow around thin and flexible membranes. Numerical simulations can now simulate this strong fluid-structure ...
  • Modal Analysis of Pressures on a Full-Scale Spinnaker 
    Article dans une revue avec comité de lecture
    DEPARDAY, Julien; ccBOT, Patrick; ccHAUVILLE, Frederic; AUGIER, Benoit; RABAUD, Marc; MOTTA, Dario; LE PELLEY, David (The Society of Naval Architects and Marine Engineers, 2017)
    While sailing offwind, the trimmer typically adjusts the downwind sail “on the verge of luffing”, occasionally letting the luff of the sail flap. Due to the unsteadiness of the spinnaker itself, maintaining the luff on the ...
  • Fluid Structure Interaction of Yacht Sails in the Unsteady Regime 
    Chapitre d'ouvrage scientifique
    AUGIER, Benoit; DURAND, Mathieu; ccBOT, Patrick; ccHAUVILLE, Frederic (Editions de l'Ecole Polytechnique, 2013)
    The dynamic Fluid Structure Interaction (FSI) of yacht sails submitted to a harmonic pitching motion is numerically investigated to address both issues of aerodynamic unsteadiness and structural deformation. The model ...
  • Experimental validation of unsteady models for fluid structure interaction: Application to yacht sails and rigs 
    Article dans une revue avec comité de lecture
    AUGIER, Benoit; ccBOT, Patrick; ccHAUVILLE, Frederic; DURAND, Mathieu (Elsevier, 2012)
    This work presents a full scale experimental study on the aero-elastic wind/sails/rig interaction in real navigation conditions with the aim to give an experimental validation of unsteady fluid structure interaction (FSI) ...

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