Image processing using proper orthogonal and dynamic mode decompositions for the study of cavitation developing on a NACA0015 foil
Idioma
en
Article de revue
Este ítem está publicado en
Experiments in Fluids. 2016, vol. 57, n° 10, p. 157-182
Springer Verlag (Germany)
Resumen en inglés
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 ...Leer más >
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.< Leer menos
Palabras clave en inglés
NACA0015 foil
Signal postprocessing
Hydrodynamic instabilities
Orígen
Importado de HalCentros de investigación