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Frequency and Amplitude Modulations of a Moving Structure in Unsteady Non-Homogeneous Density Fluid Flow

Article dans une revue avec comité de lecture
Author
RAJAOMAZAVA, Tolotra Emerry
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
BENAOUICHA, Mustapha
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
421305 Institut des Sciences de la mécanique et Applications industrielles [IMSIA - UMR 9219]
1042637 Segula Technologies [France]
ASTOLFI, Jacques-André
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
BOUDRAA, Abdel-Ouahab
13094 Institut de Recherche de l'Ecole Navale [IRENAV]
300396 Ecole Navale [EN]

URI
http://hdl.handle.net/10985/22740
DOI
10.3390/fluids6030130
Date
2021-03
Journal
Fluids

Abstract

A fluid-structure interaction’s effects on the dynamics of a hydrofoil immersed in a fluid flow of non-homogeneous density is presented and analyzed. A linearized model is applied to solve the fluid-structure coupled problem. Fluid density variations along the hydrofoil upper surface, based on the sinusoidal cavity oscillations, are used. It is shown that for the steady cavity case, the value of cavity length Lp does not affect the amplitude of the hydrofoil displacements. However, the natural frequency of the structure increases according to Lp. In the unsteady cavity case, the variations of the added mass and added damping (induced by the fluid density rate of change) generate frequency and amplitude modulations in the hydrofoil dynamics. To analyse this phenomena, the empirical mode decomposition, a well established data-driven method to handle such modulations, is used.

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