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

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 s...

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Bibliographic Details
Published inFluids (Basel) Vol. 6; no. 3; p. 130
Main Authors Rajaomazava, Tolotra Emerry, Benaouicha, Mustapha, Astolfi, Jacques-André, Boudraa, Abdel-Ouahab
Format Journal Article
LanguageEnglish
Published MDPI 01.03.2021
MDPI AG
Subjects
added damping
added mass
amplitude modulation
Engineering Sciences
fluid-structure interaction
Fluids mechanics
frequency modulation
Mechanics
non-homogeneous fluid density
Structural mechanics
Added damping
Added mass
Frequency modulation
Empirical mode decomposition
Cavity oscillations
Amplitude modulation
Fluid-structure interaction
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Summary: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.
ISSN:2311-5521
2311-5521
DOI:10.3390/fluids6030130