PROTHIN, Sébastien; BILLARD, Jean-Yves; DJERIDI, Henda

doi:10.1007/s00348-016-2246-1

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PROTHIN, Sébastien
Département Aérodynamique Energétique et Propulsion [DAEP]

BILLARD, Jean-Yves
Institut de Recherche de l'Ecole Navale [IRENAV]

DJERIDI, Henda
Laboratoire des Écoulements Géophysiques et Industriels [Grenoble] [LEGI ]

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Experiments in Fluids. 2016, vol. 57, n° 10, p. 157-182

Springer Verlag (Germany)

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The purpose of the present study is to get a better understanding of the hydrodynamic instabilities of sheet cavities which develop along solid walls. The main objective is to highlight the spatial and temporal behavior of such a cavity when it develops on a NACA0015 foil at high Reynolds number. Experimental results show a quasi-steady, periodic, bifurcation domain, with aperiodic cavity behavior corresponding to σ/2α values of 5.75, 5, 4.3 and 3.58. Robust mathematical methods of signal postprocessing (proper orthogonal decomposition and dynamic mode decomposition) were applied in order to emphasize the spatio-temporal nature of the flow. These new techniques put in evidence the 3D effects due to the reentrant jet instabilities or due to propagating shock wave mechanism at the origin of the shedding process of the cavitation cloud.< Réduire

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NACA0015 foil

Signal postprocessing

Hydrodynamic instabilities

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Image processing using proper orthogonal and dynamic mode decompositions for the study of cavitation developing on a NACA0015 foil

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