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dc.contributor.author
 hal.structure.identifier
BOT, Patrick
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
dc.date.accessioned2014
dc.date.available2014
dc.date.issued2012
dc.date.submitted2014
dc.identifier.issn0142-727X
dc.identifier.urihttp://hdl.handle.net/10985/8685
dc.descriptionA novel method similar to marching technique was used to model wind tunnel tests. ► Sail trim criteria based on their interactive effect are identified. ► Areas of separated flow were characterised. ► Local flow field was correlated with sail surface pressures. ► An aerodynamic model based on potential flow with viscous correction is proposed.
dc.description.abstractThe aerodynamics of a sailing yacht with different sail trims are presented, derived from simulations performed using Computational Fluid Dynamics. A Reynolds-averaged Navier-Stokes approach was used to model sixteen sail trims first tested in a wind tunnel, where thepressure distributions on the sails were measured. An original approach was employed byusing two successive simulations: the first one on a large domain to model the blockage due to the wind tunnel walls and the sails model, and a second one on a smaller domain to model the flow around the sails model. A verification and validation of the computed aerodynamic forces and pressure distributions was performed. The computed pressure distribution is shown to agree well with the measured pressures. The sail surface pressure was correlated with the increase of turbulent viscosity in the laminar separation bubble, the flow reattachment and the trailing edge separation. The drive force distribution on both sails showed that the fore part of the genoa (fore sail) provides the majority of the drive force and that the effect of the aft sail is mostly to produce an upwash effect on the genoa. An aerodynamic model based on potential flow theory and a viscous correction is proposed. This model, with one free parameter to be determined, is shown to fit the results better than the usual form drag and induced drag only, even if no friction drag is explicitly considered.
dc.description.sponsorshipthe third author received a financial support from Brest Métropole Océane and the ERASMUS scholarship
dc.language.isoen
dc.publisherElsevier
dc.rightsPre-print
dc.subjectsail aerodynamics
dc.subjectCFD
dc.subjectRANS
dc.subjectyacht
dc.subjectlaminar separation bubble
dc.subjectviscous drag
dc.titleUpwind sail aerodynamics : A RANS numerical investigation validated with wind tunnel pressure measurements
dc.identifier.doi10.1016/j.ijheatfluidflow.2012.10.004
dc.typdocArticle dans une revue avec comité de lecture
dc.localisationCentre de Paris
dc.subject.halPhysique: Dynamique des Fluides
dc.subject.halMathématique: Analyse numérique
dc.subject.halSciences de l'ingénieur: Mécanique: Mécanique des fluides
ensam.audienceInternationale
ensam.page90-101
ensam.journalInternational Journal of Heat and Fluid Flow
ensam.volume39
hal.identifierhal-01071323
hal.version1
hal.submission.permittedupdateFiles
hal.statusaccept


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