Structural damage analysis of a fast ship due to bow flare slamming

Yamamoto, Yuki; Iida, Kunihirio; Fukasawa, Tomonori; Murakami, Tamotsu; Arai, Makoto; Ando, A

doi:10.3233/isp-1985-3236902

Cited by 31 publications

(18 citation statements)

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“…These high impact pressures in turn produce large global loads on the ship, resulting in whipping of the entire hull structure. This subsequent whipping has been known to cause damage to ships, as noted by Andrew and Lloyd (1982) and Yamamoto et al (1985).…”

Section: Introductionmentioning

confidence: 94%

“…In fact, full-scale trials on ships have shown that bow flare slamming, rather than keel slamming, is typically the more violent form experienced by frigates (Hay et al 1994) and containerships (Vulovich et al 1989). Yamamoto et al (1985) observed significant damage on the flared section of a containership's hull due to bow flare slamming. Theoretical analyses completed by Arai et al (1995) and Zhao and Faltinsen (1993) demonstrated that flared bow sections are indeed subjected to larger slamming pressures than simpler U-or V-shaped sections.…”

Section: 2mentioning

confidence: 99%

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A combined strip theory and Smoothed Particle Hydrodynamics approach for estimating slamming loads on a ship in head seas

Veen

Gourlay

2012

Ocean Engineering

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Smoothed Particle Hydrodynamics (SPH) is a mesh-free Lagrangian numerical method suited to modelling fluids with a freely deforming surface. A two-dimensional SPH algorithm has been developed and applied to the problem of ship keel and bow-flare slamming. Freely decelerating drop tests of a model flared hull section were used as a basis for an initial validation of the SPH model. Relative vertical velocity profiles measured during tow tank experiments were then imposed on two-dimensional SPH models and reasonable agreement between the experimental and numerical slamming pressures was found. Finally, relative vertical velocity profiles calculated using SEAWAY software were implemented in the SPH algorithm, so as to simulate slamming on a typical V-form hull model.

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Section: Introductionmentioning

confidence: 94%

Section: 2mentioning

confidence: 99%

A combined strip theory and Smoothed Particle Hydrodynamics approach for estimating slamming loads on a ship in head seas

Veen

Gourlay

2012

Ocean Engineering

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“…It seems plausible that it is this fact that makes the severity of slamming so unpredictable and that, therefore, operators are very cautious and react to incidental impacts by reducing speed. Adapted from Yamamoto et al [12].…”

Section: The Importance Of Slammingmentioning

confidence: 99%

Slamming of ships: where are we now?

Kapsenberg

2011

Phil. Trans. R. Soc. A.

112

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Literature published on the problem of ship slamming in waves is reviewed from the point of view of someone working at a ship research institute. Such an institute is confronted with rather practical questions regarding the acceptability of certain design parameters such as the acceptable amount of bow flare angle for use at sea. The importance of these questions is illustrated by noting that actual slamming or the presumed danger of slamming is the main reason for ship operators to reduce speed or to change heading. The review shows that such questions cannot yet be answered. The problem of the local effect of the impact is very complicated owing to the importance of air inclusions, bubbles in the water, compressibility of water and cavitation effects. Only a computational method properly including all these effects will give an accurate answer; also model tests will not be capable of doing this, if only because the methods to extrapolate the results of models to full scale are not yet developed. The problem of the global response of the ship to a wave impact is closer to being solved. A two-stage approach is proposed, consisting of a computational fluid dynamics method for individual impacts and an approximate method to be included in long-term simulations. However, to arrive at a realistic longterm distribution, one has to account for the seamanship of the captain; avoiding the worst conditions or adapting the ship speed and course has a large effect on the actual extremes. Research on this topic has hardly begun.

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“…Among such impulsive loadings, hull slamming may produce local structural damages on the vessels due to stress concentration and fatigue. As a consequence, the analysis of water entry problems has been widely investigated in the literature [1,2,3]. In particular, the impact of a wedge on the water free surface is a complex and nonlinear phenomenon, and the estimation of impact loads is a challenging engineering subject, which has attracted considerable interest in the research community [1,2,3,7,5,6].…”

Section: Introductionmentioning

confidence: 99%

Front-tracking lattice Boltzmann simulation of a wedge water entry

Zarghami¹,

Porfiri²,

Jannelli³

et al. 2015

AIP Conference Proceedings

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In this work, we present the implementation of a front-tracking variant of the lattice Boltzmann method to model water entry problems. In this method, the fluid is considered incompressible, the gas dynamics is neglected and the free surface is represented through a layer of interface cells, whose dynamics is described using the mass and momentum fluxes across it. The consistency and accuracy of the computations is demonstrated through comparisons with theoretical solutions and experimental data reported in the literature

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Structural damage analysis of a fast ship due to bow flare slamming

Cited by 31 publications

References 0 publications

A combined strip theory and Smoothed Particle Hydrodynamics approach for estimating slamming loads on a ship in head seas

A combined strip theory and Smoothed Particle Hydrodynamics approach for estimating slamming loads on a ship in head seas

Slamming of ships: where are we now?

Front-tracking lattice Boltzmann simulation of a wedge water entry

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