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J. Mar. Sci. Eng. 2018, 6(4), 155; https://doi.org/10.3390/jmse6040155

On Air-Cavity Formation during Water Entry of Flexible Wedges

1
Niccolò Cusano University, Engineering Faculty, via don Carlo Gnocchi 3, 00166 Rome, Italy
2
Alma Mater Studiorum—Università di Bologna, DIN, via Fontanelle 40, 47121 Forlì, Italy
*
Author to whom correspondence should be addressed.
Received: 18 October 2018 / Revised: 23 November 2018 / Accepted: 3 December 2018 / Published: 12 December 2018
(This article belongs to the Special Issue Engineering Mathematics in Ship Design)
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Abstract

Elastic bodies entering water might experience fluid–structure interaction phenomena introduced by the mutual interaction between structural deformation and fluid motion. Cavity formation, often misleadingly named cavitation, is one of these. This work presents the results of an experimental investigation on the water entry of deformable wedges impacting a quiescent water surface with pure vertical velocity in free fall. The experimental campaign is conducted on flexible wedges parametrically varying the flexural stiffness, deadrise angle, and drop height. It is found that, under given experimental conditions, cavity pockets form beneath the wedge. Their generation mechanism might be ascribed to a differential between structural and fluid velocities, which is introduced by structural vibrations. Results show that the impact force during water entry of stiff wedges are always opposing gravity, while, in case flexible wedges temporarily reverse their direction, with the body that is being sucked into the water within the time frame between the cavity formation and its collapse. Severe impact might also generate a series of cavity generation and collapses. View Full-Text
Keywords: water entry; hydroelasticity; cavitation; FSI; SPH; slamming water entry; hydroelasticity; cavitation; FSI; SPH; slamming
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Panciroli, R.; Pagliaroli, T.; Minak, G. On Air-Cavity Formation during Water Entry of Flexible Wedges. J. Mar. Sci. Eng. 2018, 6, 155.

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