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Coherent and turbulent process analysis effects of a longitudinal vortex on boundary layer detachment on a NACA0015 foil

Article dans une revue avec comité de lecture
Author
PROTHIN, Sébastien
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
106820 Département Aérodynamique Energétique et Propulsion [DAEP]
DJERIDI, Henda
913 Laboratoire de physique des océans [LPO]
BILLARD, Jean-Yves
13094 Institut de Recherche de l'Ecole Navale [IRENAV]

URI
http://hdl.handle.net/10985/9034
DOI
10.1016/j.jfluidstructs.2013.08.014
Date
2013
Journal
Journal of Fluids and Structures

Abstract

In this paper, the influence of a single tip vortex on boundary layer detachment is studied. This study offers a preliminary approach in order to better understand the interaction between a propeller hub vortex and the rudder installed in its wake. This configuration belongs to the field of marine propulsion and encompasses such specific problem as cavitation inception, modification of propulsive performances and induced vibrations. To better understand the complex mechanisms due to propeller–rudder interactions it was decided to emphasize configurations where the hub vortex is generated by an elliptical 3-D foil and is located upstream of a 2-D NACA0015 foil at high incidences for a Reynolds number of 5 105. The physical mechanisms were studied using Time Resolved Stereoscopic Particle Image Velocimetry (TR-SPIV) techniques. Particular attention was paid to the detachment at 251 incidence and a detailed cartography of the mean and turbulent properties of the wake is presented. Proper Orthogonal Decomposition (POD) analysis was applied in order to highlight the unsteady nature of the flow using phase averaging based on the first POD coefficients to characterize the turbulent and coherent process in the near wake of the rudder.

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