Hydroelasticity

In fluid dynamics and elasticity, hydroelasticity or flexible fluid-structure interaction (FSI), is a branch of science which is concerned with the motion of deformable bodies through liquids. The theory of hydroelasticity has been adapted from aeroelasticity, to describe the effect of structural response of the body on the fluid around it. Definition It is the analysis of the time-dependent interaction of hydrodynamic and elastic structural forces. Vibration of floating and submerged ocean structures/vessels encompasses this field of naval architecture. Importance Hydroelasticity is of concern in various areas of marine technology such as:

High-speed craft.
Ships with the phenomena springing and whipping affecting fatigue and extreme loading
Large scale floating structures such as floating airports , floating bridges and buoyant tunnels.
Marine Risers.
Cable

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Résumé

High-speed craft.
Ships with the phenomena springing and whipping affecting fatigue and extreme loading
Large scale floating structures such as floating airports , floating bridges and buoyant tunnels.
Marine Risers.
Cable

Source officielle

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La réponse statique et dynamique des systèmes couplés fluide-structure résultant de l'excitation indépendante, l'excitation induite par le mouvement, et l'excitation induite par les instabilités des fluides.

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Wake flow analysis for a hydrofoil with and without hydroelastic lock-in

François Avellan, Philippe Dupont

The influence of the cavitation level on the vortex shedding frequency is used to compare the flow field in the wake of a blunt hydrofoil, with and without hydroelastic lock-in, and with a constant Reynolds number. Accurate LOA measurements allow us to examine in detail the base flow regime considered as the excitation source of the hydroelastic phenomena. Thanks to these measurements, a second vortex street superposed on the Karman street has been observed. Comparisons between measurements and calculations show that a Strouhal number evaluation based on boundary layer displacement thickness agrees well with experiments. Finally, the influence on the configuration of the wake is considered by modifying the shape of the trailing edge.

BHRA1987

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