Hydroelasticity in water-entry problems: Comparison between experimental and SPH results

► This work investigates hydroelasticity during the water entry of wedges. ► Experimental results and SPH numerical simulations are presented. ► The numerical results predict the impact dynamics and the structural deformation. ► Simplified SPH numerical solutions are valid only if no air is trapped...

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Bibliographic Details
Published in:Composite structures 2012, Vol.94 (2), p.532-539
Main Authors: Panciroli, R., Abrate, S., Minak, G., Zucchelli, A.
Format: Article
Language:English
Subjects:
Applied fluid mechanics
Computational fluid dynamics
Deformation
Elastic wedges
Exact sciences and technology
Finite element method
Fluid dynamics
Fluid flow
Fluid/structure interaction
Fundamental areas of phenomenology (including applications)
Hydrodynamics, hydraulics, hydrostatics
Hydroelasticity
Lightweight
Mathematical models
Physics
Slamming
Solid mechanics
SPH
Structural and continuum mechanics
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
Wedge
Weight reduction
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Summary:► This work investigates hydroelasticity during the water entry of wedges. ► Experimental results and SPH numerical simulations are presented. ► The numerical results predict the impact dynamics and the structural deformation. ► Simplified SPH numerical solutions are valid only if no air is trapped in the fluid. Hydroelastic impacts are of major interest in naval applications since, due to the mutual interaction between structural deformation and fluid motion, the impact-induced pressure and the impact dynamics can highly differ from a quasi-static solution. Hydroelastic effects are mostly important when the vessels are made with composite lightweight structures, due to the higher impact speed that can be reached. This work present an experimental and numerical study on the hydroelastic phenomena during the water-entry of elastic wedges. The numerical model is based on a coupled FEM and Smoothed Particle Hydrodynamics (SPH) formulation available in the commercial code Ls-Dyna. Results are compared with experiments about slamming of elastic wedges varying thickness, deadrise angle and impact velocity. Special attention is paid to the structural deformations. In particular, it is shown that more than one mode shape dominates the structural deformation in case of high hydroelastic impacts. Very high hydroelastic effects are observed, and the numerical solutions are found to be in good agreement with the measured data. The range of validity of the SPH technique to investigate hydroelastic effects during the water entry of elastic wedges is also outlined.
ISSN:0263-8223
1879-1085
DOI:10.1016/j.compstruct.2011.08.016