Experimental investigation of water impact on axisymmetric bodies

Backer, Griet De; Vantorre, Marc; Beels, Charlotte; Pré, J. De; Victor, Sam; Rouck, Julien De; Blommaert, Chris; Paepegem, Wim Van

doi:10.1016/j.apor.2009.07.003

Cited by 92 publications

(33 citation statements)

References 19 publications

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“…Systematic experiments were carried out on two-dimensional bodies like wedges as early as 1952 by Bisplinghoff & Doherty and are still being done recently [61][62][63]. Bisplinghoff & Doherty [64] carried out free-fall experiments and derived the impact force from the deceleration of the test section.…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…Their results from the water entry tests showed significant dynamic effects that were attributed to the different components of the test apparatus, illustrating the complexity of the experiment. De Backer et al [63] carried out drop tests with a hemisphere and cones with different relatively high deadrise angles. A high-speed camera was used to measure the impact velocity and the pile-up along the body.…”

Section: Experimental Techniquesmentioning

confidence: 99%

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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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Section: Experimental Techniquesmentioning

confidence: 99%

Section: Experimental Techniquesmentioning

confidence: 99%

Slamming of ships: where are we now?

Kapsenberg

2011

Phil. Trans. R. Soc. A.

112

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“…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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“…Since then, it has been studied mainly by using wedges [Zhao and Faltinsen, 1993;Greenhow, 1987], cones [Backer et al, 2009] and cylinders [Cointe and Armand, 1987]. Plates can be considered as a special case of wedges with zero deadrise angle in theory.…”

Section: Introductionmentioning

confidence: 99%

On Slamming Pressure of Flat Elastic Plates with Different Aspect Ratios

Yan

Sun

2016

Coastal Engineering Journal

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Flat plate slamming problem involves complicated interactions between the solid or deformable structure with the air-water flow. In order to investigate this problem, we carried out a series of dropping tests using flat elastic plates with different aspect ratios in a water tank while measuring pressure on the plates and observe the flow field. Both the longitudinal edges of each plate are kept close to the tank walls and so deflection of the plate and associated flow may be considered as two-dimensional (2D). Time histories of the pressure and its maximum values are reported in this paper. Based on the experimental results, the maximum values and durations of the pressure measured at the center of the plates are compared with empirical formulae in literatures.

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Experimental investigation of water impact on axisymmetric bodies

Cited by 92 publications

References 19 publications

Slamming of ships: where are we now?

Slamming of ships: where are we now?

Bottom slamming on heaving point absorber wave energy devices

On Slamming Pressure of Flat Elastic Plates with Different Aspect Ratios

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