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Article Dans Une Revue Ocean Engineering Année : 2019

Experimental and Numerical Investigation of the Fluid-Structure Interaction on a Flexible Composite Hydrofoil under Viscous Flows

Résumé

This research investigates the fluid-structure interaction and hydroelastic response of a composite hydrofoil using an innovative joint experimental and numerical method. The main novelties are, first, the use of a state-of-the-art strain measurement technique, via a fully-distributed-optical fiber sensor directly 20 embedded within the composite plies. This method allows for a finer representation of the structural deformations under hydrodynamic loading. Second, a tightly-coupled high-fidelity fluid-structure interaction numerical model taking into account the turbulent effects in the flow and the ply-by-ply modelling of the composite, is compared to the experimental results. A composite profile is specifically designed as a trapezoidal hydrofoil and is tested for moderate Reynolds number and pre-stall and post-stall incidences. High-speed imaging of the hydrofoil tip and vibrometer measurements are carried out to determine the experimental tip displacements and hydrofoil's vibrations. The numerical and experimental results show a very strong hydroeleastic response, with a structural resonance even for low Reynolds numbers due to the high flexibility of the structure. Strong coupling of the fluid and the structure, with lock-in of the von Kármán vortex-shedding to the structure for small incidences, and an excitation of the 30 structure by leading-edge vortex-shedding for higher incidences, are also observed.
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Dates et versions

hal-02587704 , version 1 (15-05-2020)
hal-02587704 , version 2 (04-06-2020)

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Laetitia Pernod, Antoine Ducoin, Herve Le Sourne, Jacques-André Astolfi, Pascal Casari. Experimental and Numerical Investigation of the Fluid-Structure Interaction on a Flexible Composite Hydrofoil under Viscous Flows. Ocean Engineering, 2019, 194, pp.106647. ⟨10.1016/j.oceaneng.2019.106647⟩. ⟨hal-02587704v2⟩
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