Wedge-Shaped Shell Structure Impacting a Water Surface

Constantinescu, Adrian; Bertram, Volker; Fuiorea, Ion; Nême, Alain

doi:10.1115/pvp2005-71186

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Dans ce cadre, de nombreuses approches sont possibles. Dans (Donguy, 2002 ;Peseux et al, 2005 ;Constantinescu, 2006) et (Constantinescu et al, 2008), des modèles numériques basés sur la théorie de Wagner sont proposés pour les cas bidimensionnels. Le problème potentiel linéarisé est, dans ce cas, résolu par la méthode des éléments finis.…”

Section: Introductionunclassified

Comparaison de différentes approches pour la simulation numérique d’impacts hydrodynamiques

Jacques¹,

Constantinescu²,

Kerampran³

et al. 2010

TECM

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The aim of this paper is to compare several simulation methods for hydrodynamic impact problems. For this purpose, three models has been developed: (i) a finite element model based on the Wagner theory, (ii) a finite element model based on a Arbitrary Lagrangian Eulerian (ALE) formulation, (iii) a finite volume model based on a two-phase eulerian formalism and the Volume-of-Fluid technique. The different results are compared with published and experimental data.

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Section: Introductionunclassified

Comparaison de différentes approches pour la simulation numérique d’impacts hydrodynamiques

Jacques¹,

Constantinescu²,

Kerampran³

et al. 2010

TECM

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“…that of Peseux et al [1]. With the current evolution in computer power, CFD models are also increasingly used for simulations of slamming phenomena [18][19][20][21][22]. Slamming pressures on typical point absorber shapes have been experimentally investigated by means of drop tests in [23,24].…”

Section: Slamming Loadsmentioning

confidence: 99%

Bottom slamming on heaving point absorber wave energy devices

et al. 2010

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Oscillating point absorber buoys may rise out of the water and be subjected to bottom slamming upon reentering the water. Numerical simulations are performed to estimate the power absorption, the impact velocities and the corresponding slamming forces for various slamming constraints. Three buoy shapes are considered: a hemisphere and two conical shapes with deadrise angles of 30°a nd 45°, with a waterline diameter of 5 m. The simulations indicate that the risk of rising out of the water is largely dependent on the buoy draft and sea state. Although associated with power losses, emergence occurrence probabilities can be significantly reduced by adapting the control parameters. The magnitude of the slamming load is severely influenced by the buoy shape. The ratio between the peak impact load on the hemisphere and that on the 45°c one is approximately 2, whereas the power absorption is only 4-8% higher for the 45°cone. This work illustrates the need to include slamming considerations aside from power absorption criteria in the buoy shape design process and the control strategy.

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Hull Slamming

Abrate

2011

Applied Mechanics Reviews

145

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This report presents an in-depth review of the current state of knowledge on hull slamming, which is one of several types of slamming problems to be considered in the design and operation of ships. Hull slamming refers to the impact of the hull or a section of the hull as it reenters the water. It can be considered to be part of a larger class of water entry problems that include the water landing of spacecraft and solid rocket boosters, the water landing and ditching of aircraft, ballistic impacts on fuel tanks, and other applications. The problem involves the interaction of a structure with a fluid that has a free surface. Significant simplifications can be achieved by considering a two-dimensional cross section of simple shape (wedge, cone, sphere, and cylinder) and by assuming that the structure is a rigid body. The water is generally modeled as an incompressible, irrotational, inviscid fluid. Two approximate solutions developed by von Karman (1929, “The Impact on Seaplane Floats During Landing,” NACA Technical Note NACA-TN-32) and Wagner (1932, “Uber stoss und Gleitvorgange an der Oberache von Flussigkeiten,” Z. Angew. Math. Mech., 12, pp. 192–215) can be used to predict the motion of the body, the hydrodynamic force, and the pressure distribution on the wetted surface of the body. Near the intersection with the initial water surface, water piles up, a jet is formed, and the solution has a singularity in this region. It was shown that nearly half of the kinetic energy transferred from the solid to the fluid is contained in this jet, the rest being stored in the bulk of the fluid. A number of complicating factors are considered, including oblique or asymmetric impacts, elastic deformations, and more complex geometries. Other marine applications are considered as well as applications in aerospace engineering. Emphasis is placed on basic principles and analytical solutions as an introduction to this topic, but numerical approaches are needed to address practical problems, so extensive references to numerical approaches are also given.

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Wedge-Shaped Shell Structure Impacting a Water Surface

Cited by 3 publications

References 3 publications

Comparaison de différentes approches pour la simulation numérique d’impacts hydrodynamiques

Comparaison de différentes approches pour la simulation numérique d’impacts hydrodynamiques

Bottom slamming on heaving point absorber wave energy devices

Hull Slamming

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