Water entry of two-dimensional bodies

Zhao, Rui; Faltinsen, Odd M.

doi:10.1017/s002211209300028x

Cited by 546 publications

(429 citation statements)

References 5 publications

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“…She used the conformal mapping method and obtained the solution which satisfied the nonlinear free surface boundary conditions. The problem was further considered by Zhao & Faltinsen (1993). In particular, they solved the Laplace equation using the boundary element method together with the time matching method.…”

Section: Introductionmentioning

confidence: 99%

Simulation of water entry of a wedge through free fall in three degrees of freedom

Duan

2010

Proc. R. Soc. A.

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The water entry problem of a wedge through free fall in three degrees of freedom is studied through the velocity potential theory for the incompressible liquid. In particular, the effect of the body rotation is taken into account, which seems to have been neglected so far. The problem is solved in a stretched coordinate system through a boundary element method for the complex potential. The impact process is simulated based on the time stepping method. Auxiliary function method has been used to decouple the mutual dependence between the body motion and the fluid flow. The developed method is verified through results from other simulation and experimental data for some simplified cases. The method is then used to undertake extensive investigation for the free fall problems in three degrees of freedom.

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Section: Introductionmentioning

confidence: 99%

Simulation of water entry of a wedge through free fall in three degrees of freedom

Duan

2010

Proc. R. Soc. A.

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“…The Boundary Element Method (Greenhow & Lin, 1985;Zhao & Faltinsen, 1993) based on potential flow was commonly used as a numerical solution to solve the water entry problems in the early stage of researches but this method shows drawbacks on the treatment of the water free surface and pISSN: 1225-1143, Vol. 53, No.…”

Section: Introductionmentioning

confidence: 99%

“…In almost of the aforementioned studies, the model that used in the simulation is either simple wedge or Zhao model (Zhao & Faltinsen, 1993) whose shape does not have bulb.…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, a commercial CFD code ANSYS FLUENT ® (ANSYS Fluent user's guide, 2015) is used to simulate two cases: one is to validate impact pressure using conventionally well-known test case by Zhao et al (Zhao & Faltinsen, 1993), second is two different bow flare sections with constant velocities in order to investigate the effect of velocity variation during water entry and predict the pressure history for different flares with the influence of bulbous bow section shapes: Panamax-like(with small convex bulb and flare) and Post panamax-like(with large convex bulb and flare). 3.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of the Impact Pressure Acting on Arbitrary Ship Sections Falling into the Water Surface

Boujnah¹,

Jung²

2016

Journal of the Society of Naval Architects of Korea

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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.The interaction between the hull of ship and free surface of water generates important loads during slamming motion. In the present study, the slamming load applied on the sectional surface of two-dimensional arbitrary bodies has been investigated under several falling velocities. This simulation has been done with the commercial CFD software ANSYS FLUENT ® . Through the conventional MARINTEK experiments for the benchmark of the simulation, we verified the impact pressure values between the experiments and simulation results. Two arbitrary ship bow section models, Panamax-like(with small convex bulb and flare) and Post panamax-like(with large convex bulb and flare) are also investigated. Simulation results show that a maximum impact pressure on the Post panama-like shape is higher than the Panamax-like shape. According to both a lump of water generated by arbitrary shape and various dead-rise angles of the shape, the pressure picks were enhanced in the simulation.

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“…Based on these assumptions, analytical solutions are valid only for the initial stage of the flow which is self similar. Based on the generalized Wagner theory, Zhao and Faltinsen (1993) proposed a model reproducing the jet flow in the case of a wedge impacting the free surface. By generalizing the Zhao approach, Mei, Lui and Yue (1999) developed analytical solutions of water impact of general two dimensional sections.…”

Section: Introductionmentioning

confidence: 99%

A Moving Grid Model for Simulation of Free Surface Behavior Induced by Horizontal Cylinders Exit and Entry

Mnasri

Hafsia

Omri

et al. 2010

Engineering Applications of Computational Fluid Mechanics

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ABSTRACT:Computationnal fluid dynamics (CFD) analysis is applied to investigate the two dimensional entry and exit of horizontal cylinders in calm water. Free surface interaction with the moving cylinders is modelled using the volume of fluid method (VOF) and the dynamic mesh technique (DMT) is adopted to follow the bodies motions. The developed model is validated by following series of numerical experiments conducted by the fixed grid model of Lin (2007), with a single moving horizontal cylinder in calm water moving with constant or variable velocity. The computed free surface profiles were in very good agreement with those of Lin (2007) for both cases of an immersed cylinder moving upward or downward. For the case of water impact and entry, numerical results showed that the splash jet is adequately simulated along with the associated impulsive forces and the high pressures reported by Lin (2007). Once validated, this model was applied to study the interaction between the free surface and the entry and exit of twin cylinders. Compared to the single cylinder cases, the two cylinders simulations results showed that their impacts were much more significant for the entry case where a large central jet was observed.

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Water entry of two-dimensional bodies

Cited by 546 publications

References 5 publications

Simulation of water entry of a wedge through free fall in three degrees of freedom

Simulation of water entry of a wedge through free fall in three degrees of freedom

Numerical Investigation of the Impact Pressure Acting on Arbitrary Ship Sections Falling into the Water Surface

A Moving Grid Model for Simulation of Free Surface Behavior Induced by Horizontal Cylinders Exit and Entry

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