Abstract
This work numerically evaluates the role of advancing velocity on the water entry of rigid wedges, highlighting its influence on the development of underpressure at the fluid–structure interface, which can eventually lead to fluid detachment or cavity formation, depending on the geometry. A coupled FEM–SPH numerical model is implemented within LS-DYNA, and three types of asymmetric impacts are treated: (I) symmetric wedges with horizontal velocity component, (II) asymmetric wedges with a pure vertical velocity component, and (III) asymmetric wedges with a horizontal velocity component. Particular attention is given to the evolution of the pressure at the fluid–structure interface and the onset of fluid detachment at the wedge tip and their effect on the rigid body dynamics. Results concerning the tilting moment generated during the water entry are presented, varying entry depth, asymmetry, and entry velocity. The presented results are important for the evaluation of the stability of the body during asymmetric slamming events.
Highlights
IntroductionMany analytical methods have been proposed to extend Wagner’s method to different shapes (e.g., [2,3,4,5,6,7]) and most of them are very effective in predicting the water entry of simple-shaped structures impacting the surface with pure vertical velocity
A typical water entry event that largely deviates from a symmetric case is ditching [13,14,15], where fluid detachment and cavitation arise if the advancing velocity is sufficiently large
The following three cases were considered: symmetric wedges entering the water with a velocity vector with components normal and tangential to the fluid surface, asymmetric wedges falling vertically, and, the combination of asymmetry and a generic velocity vector
Summary
Many analytical methods have been proposed to extend Wagner’s method to different shapes (e.g., [2,3,4,5,6,7]) and most of them are very effective in predicting the water entry of simple-shaped structures impacting the surface with pure vertical velocity Some of these solutions are even capable of accounting for oblique impacts (e.g., [8,9,10,11,12]). A typical water entry event that largely deviates from a symmetric case is ditching [13,14,15], where fluid detachment and cavitation arise if the advancing velocity is sufficiently large Another area of interest for asymmetric impacts is the analysis of the response of planing hulls during the maneuvering operation since, depending on the conditions, restoring or capsizing moments can take place [16].
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