OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

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

Prothin, Sebastien and Billard, Jean-Yves and Djeridi, Henda Image processing using proper orthogonal and dynamic mode decompositions for the study of cavitation developing on a NACA0015 foil. (2016) Experiments in Fluids, 57 (157). 1-25. ISSN 0723-4864

[img]
Preview
(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
5MB

Official URL: https://doi.org/10.1007/s00348-016-2246-1

Abstract

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 quasisteady, 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.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at https://link.springer.com/article/10.1007/s00348-016-2246-1
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Navale (FRANCE)
Other partners > Institut polytechnique de Grenoble (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Université Joseph Fourier Grenoble 1 - UJF (FRANCE)
Laboratory name:
Statistics:download
Deposited By: Sebastien Prothin
Deposited On:27 Nov 2017 12:50

Repository Staff Only: item control page