Numerical simulation and experimental study of water entry of a wedge in free fall motion

Wu, G.X.; Sun, Hanbing; He, Yanping

doi:10.1016/j.jfluidstructs.2004.01.001

Cited by 177 publications

(98 citation statements)

References 15 publications

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“…g e in figure 4 is the acceleration due to gravity and the frictional resistance in the experiment. The results from the present computation are graphically the same as those obtained by Wu et al (2004). The experimental data by Wu et al (2004) are also included in figure 4.…”

Section: Numerical Results and Discussionsupporting

confidence: 57%

“…The results from the present computation are graphically the same as those obtained by Wu et al (2004). The experimental data by Wu et al (2004) are also included in figure 4. Figure 4 further gives results for the horizontal and rotational motions.…”

Section: Numerical Results and Discussionsupporting

confidence: 57%

“…Another issue of solving the problem directly in the physical domain is that, if the sizes of the elements remain more or less the same, there will be few elements initially but a large number of elements later on. Thus, a more rational approach is to use the stretched system (Wu et al 2004;Wu 2007a).…”

Section: Mathematical Model and Numerical Proceduresmentioning

confidence: 99%

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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: Numerical Results and Discussionsupporting

confidence: 57%

Section: Numerical Results and Discussionsupporting

confidence: 57%

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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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“…Physically, the velocity of the liquid along the direction of the wall should have no effect on the shape of the free surface and the pressure on the wetted part of the wall. This is also obvious enough if the mathematical model is established in the system moving with the liquid [4][5][6]. However, in the present model, the system is fixed on the solid wedge.…”

Section: (B) Validation Of the Numerical Approachmentioning

confidence: 92%

Asymmetric impact between liquid and solid wedges

Semënov

2013

Proc. R. Soc. A.

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The hydrodynamic problem of impact between a solid wedge and a liquid wedge is analysed. The liquid is assumed to be ideal and incompressible; gravity and surface tension effects are ignored. The flow generated by the impact is assumed to be irrotational and therefore can be described by the velocity potential theory. The solution procedure is based on the analytical derivation of the complexvelocity potential in a parameter plane and the function mapping conformally the parameter plane onto the similarity plane. The mapping function is found as a combination of the derivatives of the complex potential in the similarity and parameter planes, through the integral equations for mixed and homogeneous boundary-value problems in terms of the velocity modulus and the velocity angle with the fluid boundary, together with the dynamic and kinematic boundary conditions. These equations are solved through a numerical method. The procedure is first verified through comparisons with some known results. Simulations are then made for a variety of cases, and detailed results are presented in terms of the free surface shape, streamlines, pressure distribution on the wetted solid surface, and contact angles between the free surface and the body surface.

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“…And Moyo and Greenhow (2000) presented a fully non linear inviscid flow model for the calculation of the deformation of an initially calm free surface caused by free motion of a horizontal cylinder. Wu, Sun and He (2004) proposed a hydrodynamic model of a wedge entering water through free fall motion based on the complex velocity potential theory. The developed jet is treated analytically based on the shallow water approximation.…”

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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Numerical simulation and experimental study of water entry of a wedge in free fall motion

Cited by 177 publications

References 15 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

Asymmetric impact between liquid and solid wedges

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

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