Numerical study on the water entry of curved wedges

Yu, Pengyao; Li, Hui; Ong, Muk Chen

doi:10.1080/17445302.2018.1471776

Cited by 23 publications

(5 citation statements)

References 21 publications

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“…The impact pressure factor K can be regarded as constant and is independent of sea severity and impact speed. The value of K can be determined by different methods such as empirical formula (Ochi and Motter, 1973), Rule Book approach (Lloyd's Register, 2011), experiments (Wang and Guedes Soares, 2016b) and numerical simulation (Wang and Guedes Soares, 2013;Yu et al, 2018).…”

Section: Estimation Of the Impact Pressure Factormentioning

confidence: 99%

Slamming and green water loads on a ship sailing in regular waves predicted by a coupled CFD–FEA approach

et al. 2021

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Section: Estimation Of the Impact Pressure Factormentioning

confidence: 99%

Slamming and green water loads on a ship sailing in regular waves predicted by a coupled CFD–FEA approach

et al. 2021

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“…The impact of a body which can be expressed by the power law s(x) = α x β is now investigated for α > 0 and β > 0. Drop tests 39 and numerical simulations 40 involving curved wedges, with shapes similar to this, have been conducted. However, the minimum mean deadrise angle in these experiments was 25 ○ and gas entrainment was not observed.…”

Section: Power-law Bodymentioning

confidence: 99%

A comparison of pre-impact gas cushioning and Wagner theory for liquid-solid impacts

Ross

Hicks

2019

Physics of Fluids

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The normal impact of a symmetric rigid body with an initially quiescent liquid half-space is considered using both Wagner theory and a model of viscous gas pre-impact cushioning. The predictions of these two theories are compared for a range of different body shapes. Both theories assume that the impactor has small deadrise angle. Novel solutions of the Wagner normal impact problem for a symmetric body with a power-law shape are presented, which generalize the well-known results for a parabola and a wedge. For gas cushioned pre-impacts, it is shown that a pocket of gas is entrained even for body shapes with a cusp at the body minimum. A scaling law is developed that relates the dimensions of the trapped gas pocket to the slope of the body. For pre-impact gas cushioning, surface tension is shown to smooth the liquid free-surface and delay the instant of touchdown for a smooth parabolic body, while for a wedge, increasing surface tension initially delays touchdown, before hastening touchdown as the importance of surface tension is increased further. For a flat-bottomed wedge, gas entrainment is again predicted in the gas-cushioning model although the location of initial touchdown, either on the transition between the wedge and the flat bottom or along the side of the wedge, now depends upon the parameters of the body shape.

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“…Stenius et al simulated the water entry of 2D flat wedges using an arbitrary Lagrangian-Eulerian (ALE) solver in the commercial software LS-DYNA [5,6]. This numerical method has been further used to investigate the water impact of different structures, such as ship sections, by Wang and Guedes Soares [7], curved wedges by Yu et al [8], and cones and semi-spheres by Wang and Guedes Soares [9]. Bilandi et al simulated the vertical water impact of asymmetric wedges by using the finite volume method in STAR-CCM+ [10].…”

Section: Introductionmentioning

confidence: 99%

Parametric Study on the Free-Fall Water Entry of a Sphere by Using the RANS Method

Shen

Zhen

et al. 2019

JMSE

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Motivated by the application of water-entry problems in the air-drop deployment of a spherical oceanographic measuring device, the free-fall water entry of a sphere was numerically investigated by using the transient Reynolds-averaged Navier–Stokes (RANS) method. A convergence study was carried out, which accounts for the mesh density and time-step independence. The present model was validated by the comparison of non-dimensional impact force with previous experimental and numerical results. Effects of parameters, such as impact velocity, radius, and mass of the sphere on the impact force and the acceleration of the sphere, are discussed. It is found that the peak value of the non-dimensional impact force is independent of the impact velocity and the radius of the sphere, while it depends on the mass of the sphere. By fitting the relationship between the peak value of the non-dimensional impact force and the non-dimensional mass, simplified formulas for the prediction of peak values of the impact force and the acceleration were achieved, which will be useful in the design of the spherical oceanographic measuring device.

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Numerical study on the water entry of curved wedges

Cited by 23 publications

References 21 publications

Slamming and green water loads on a ship sailing in regular waves predicted by a coupled CFD–FEA approach

Slamming and green water loads on a ship sailing in regular waves predicted by a coupled CFD–FEA approach

A comparison of pre-impact gas cushioning and Wagner theory for liquid-solid impacts

Parametric Study on the Free-Fall Water Entry of a Sphere by Using the RANS Method

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