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Modal Analysis of Pressures on a Full-Scale Spinnaker

Communication avec acte
Auteur
DEPARDAY, Julien
AUGIER, Benoit
RABAUD, Marc
247320 Fluides, automatique, systèmes thermiques [FAST]
MOTTA, Dario
160272 University of Auckland [Auckland]
LE PELLEY, David
160272 University of Auckland [Auckland]
ccBOT, Patrick
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
ccHAUVILLE, Frederic

URI
http://hdl.handle.net/10985/15135
Date
2016

Résumé

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 on the verge of luffing needs continual adjustments. The propulsive force generated by the offwind sail depends on this trimming and is highly fluctuating. During a flapping sequence, the aerodynamic load can fluctuate by 50% of the average load. On a J/80 class yacht, we simultaneously measured timeresolved pressures on the spinnaker, aerodynamic loads, boat and wind data. Significant spatio-temporal patterns are detected in the pressure distribution. In this paper we present averages and main fluctuations of pressure distributions and of load coefficients for different apparent wind angles as well as a refined analysis of pressure fluctuations, using the Proper Orthogonal Decomposition (POD) method. POD shows that pressure fluctuations due to luffing of the spinnaker can be well represented by only one proper mode related to a unique spatial pressure pattern and a dynamic behavior evolving with the Apparent Wind Angles. The time evolution of this proper mode is highly correlated with load fluctuations. Moreover, POD can be employed to filter the measured pressures more efficiently than basic filters. The reconstruction using the first few modes allows to restrict to the most energetic part of the signal and remove insignificant variations and noises. This might be helpful for comparison with other measurements and numerical simulations.

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IRENav_CSYS3_2016_HAUVILLE.pdf
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Fin d'embargo:
2016-04-01
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Documents liés

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

  • 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 ...
  • Dynamic measurements of pressures, sail shape and forces on a full-scale spinnaker 
    Communication avec acte
    DEPARDAY, Julien; ccBOT, Patrick; ccHAUVILLE, Frederic; MOTTA, Dario; LE PELLEY, David; FLAY, Richard G.J. (2014)
    This work presents a full-scale experimental study on a sailing yacht in downwind conditions with simultaneous time-resolved measurements of pressures, sail shape and loads. Those on-water experiments on a J/80 class yacht ...
  • Experimental Investigation of Asymmetric Spinnaker Aerodynamics Using Pressure and Sail Shape Measurements 
    Article dans une revue avec comité de lecture
    MOTTA, Dario; FLAY, Richard G.J.; RICHARDS, P.J.; LE PELLEY, David; DEPARDAY, Julien; ccBOT, Patrick (Elsevier, 2014)
    An innovative method combining simultaneous on-water pressure and sail shape measurements for determining aerodynamic forces produced by sails is described and used on Stewart 34 and J80 Class yachts flying asymmetric ...
  • 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 ...
  • Numerical study of a flexible sail plan : effect of pitching decomposition and adjustments 
    Communication avec acte
    AUGIER, Benoit; DEPARDAY, Julien; DURAND, Mathieu; ccBOT, Patrick; ccHAUVILLE, Frederic (Ecole Navale, 2013)
    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 ...

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