Vibration of Cavitating Elastic Wing in a Periodically Perturbed Flow: Excitation of Subharmonics

Amromin, Eduard; Kovinskaya, Svetlana

doi:10.1006/jfls.2000.0291

Cited by 27 publications

(7 citation statements)

References 8 publications

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“…(Arndt, 2012;Arndt and Wosnik, 2008;Franc and Michel, 1988;Kato et al, 2006;Kawakami et al, 2008;Leroux et al, 2004;Sedlar et al, 2012) and theoretical works e.g. Amromin, 2014;Amromin and Kovinskaya, 2000;Benaouicha et al, 2009;Ducoin et al, 2012b;Harwood et al, 2012;Huang et al, 2013;Huang et al, 2012;Karim et al, 2010;Mostafa et al, 2012;Saito et al, 2007;Sedlar et al, 2012;Seo and Lele, 2009;Sun, 2012;Young, 2007); older past works are mentioned in the review paper of Abramson (1969).…”

Section: Introductionmentioning

confidence: 99%

Cavity induced vibration of flexible hydrofoils

Akcabay

Chae

Young

et al. 2014

Journal of Fluids and Structures

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The objective of this work is to investigate the influence of cavity-induced vibrations on the dynamic response and stability of a NACA66 hydrofoil at 8° angle of attack at Re=750 000 via combined experimental measurements and numerical simulations. The rectangular, cantilevered hydrofoil is assumed to be rigid in the chordwise direction, while the spanwise bending and twisting deformations are represented using a two-degrees-of-freedom structural model. The multiphase flow is modeled with an incompressible, unsteady Reynolds Averaged Navier–Stokes solver with the k–ω Shear Stress Transport (SST) turbulence closure model, while the phase evolutions are modeled with a mass-transport equation based cavitation model. The numerical predictions are compared with experimental measurements across a range of cavitation numbers for a rigid and a flexible hydrofoil with the same undeformed geometries. The results showed that foil flexibility can lead to: (1) focusing – locking – of the frequency content of the vibrations to the nearest sub-harmonics of the foil׳s wetted natural frequencies, and (2) broadening of the frequency content of the vibrations in the unstable cavitation regime, where amplifications are observed in the sub-harmonics of the foil natural frequencies. Cavitation was also observed to cause frequency modulation, as the fluid density, and hence fluid induced (inertial, damping, and disturbing) forces fluctuated with unsteady cavitation.International audienceThe objective of this work is to investigate the influence of cavity-induced vibrations on the dynamic response and stability of a NACA66 hydrofoil at 8° angle of attack at Re=750 000 via combined experimental measurements and numerical simulations. The rectangular, cantilevered hydrofoil is assumed to be rigid in the chordwise direction, while the spanwise bending and twisting deformations are represented using a two-degrees-of-freedom structural model. The multiphase flow is modeled with an incompressible, unsteady Reynolds Averaged Navier–Stokes solver with the k–ω Shear Stress Transport (SST) turbulence closure model, while the phase evolutions are modeled with a mass-transport equation based cavitation model. The numerical predictions are compared with experimental measurements across a range of cavitation numbers for a rigid and a flexible hydrofoil with the same undeformed geometries. The results showed that foil flexibility can lead to: (1) focusing – locking – of the frequency content of the vibrations to the nearest sub-harmonics of the foil׳s wetted natural frequencies, and (2) broadening of the frequency content of the vibrations in the unstable cavitation regime, where amplifications are observed in the sub-harmonics of the foil natural frequencies. Cavitation was also observed to cause frequency modulation, as the fluid density, and hence fluid induced (inertial, damping, and disturbing) forces fluctuated with unsteady cavitation

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Section: Introductionmentioning

confidence: 99%

Cavity induced vibration of flexible hydrofoils

Akcabay

Chae

Young

et al. 2014

Journal of Fluids and Structures

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“…Non linear hydroelastic behavior of propellers has also been investigated by Lin and Lin [22] using lifting surface theory. Amromin and Kovinskaya [23] analyzed theoretically the vibration of an elastic wing with an attached cavity in a periodically perturbed flow. Wing vibration was described by means of a simple beam equation.…”

Section: Introductionmentioning

confidence: 99%

An experimental analysis of fluid structure interaction on a flexible hydrofoil in various flow regimes including cavitating flow

Ducoin

Astolfi

Sigrist

2012

European Journal of Mechanics - B/Fluids

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The authors gratefully acknowledge the technical staff of IRENav for its contribution to the experimental set up.International audienceThe structural response of a rectangular cantilevered flexible hydrofoil submitted to various flow regimes is analyzed through an original experiment carried out in a hydrodynamic tunnel at a Reynolds number of 0.75 × 10 6 . The experiment considers static and transient regimes. The latter consists of transient pitching motions at low and fast pitching velocities. The experiments are also performed for cavitating flow. The structural response is analyzed through the measurement of the free foil tip section displacement using a high speed video camera and surface velocity vibrations using a laser doppler vibrometer.In non cavitating flows, it is shown that the structural response is linked to the hydrodynamic loading, which is governed by viscous effects such as laminar to turbulent transition induced by Laminar Separation Bubble (LSB), and stall. It is also observed that the foil elastic displacement depends strongly on the pitching velocity. Large overshoots and hysteresis effect are observed as the pitching velocity increases. Cavitation induces a large increase of the vibration level due to hydrodynamic loading unsteadiness and change of modal response for specific frequencies. The experimental results presented in this paper will help to develop high fidelity fluid–structure interaction models in naval applications

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“…This work focuses on FSI effects in a non-homogeneous density flow. Recent work has pointed out that two-phase flow has an impact on the fluid structure interaction for various devices, such as propeller blades or hydrofoils [4][5][6][7][8][9]. However, very few published works address the problem of estimating this impact on the structure dynamics.…”

Section: Introductionmentioning

confidence: 99%

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

Rajaomazava¹,

Benaouicha

Astolfi

et al. 2021

Fluids

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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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Vibration of Cavitating Elastic Wing in a Periodically Perturbed Flow: Excitation of Subharmonics

Cited by 27 publications

References 8 publications

Cavity induced vibration of flexible hydrofoils

Cavity induced vibration of flexible hydrofoils

An experimental analysis of fluid structure interaction on a flexible hydrofoil in various flow regimes including cavitating flow

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

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