An essential solution of water entry problems and its engineering applications

Wang, Wenhua; Wang, Yanying

doi:10.1007/s11804-010-1006-5

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…They found that the time from the impact of the cylinder on the water surface to the closure of the cavity under conditions with waves is longer than that under the no-wave condition. Wang et al [25,26] numerically simulated the vertical water entry process of a cylinder in regular waves and analyzed the influence of wave parameters on the hydrodynamic characteristics of the cylinder.…”

Section: Introductionmentioning

confidence: 99%

Effect of Wave Phases and Heights on Supercavitation Flow Field and Dynamic Characteristics of Successively Fired High-Speed Projectiles

Zhang

Wang

Jia

2023

JMSE

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The study of the water entry of successively fired projectiles under a wave environment is of great significance for the development and application of supercavitation weapons. In this paper, the supercavitating flow field of two successively fired projectiles entering water under different wave conditions is numerically simulated by the volume of the fraction model considering the cavitation of water. The motion of projectiles is handled by the overlapping grid technology and the simulated projectiles have six degrees of freedom. The effects of different wave phases and wave heights on the supercavitating flow field and the dynamic loads of the projectiles are studied. The research results show that the wave phase has an effect on the evolution and size of the supercavitation and the effect of the wave phase on the water splash above the free surface is more obvious. The peak of the drag force of the first projectile under conditions of different wave phases with 0.12 m wave height can be reduced by about 50% compared with that under the no-wave condition. The wave phases have an effect on the peak of the drag coefficient, and for the first projectile the peak under the condition of the 180° phase is about 40% lower than that of the 0° phase. The peak of the drag coefficient of the first projectile decreases with the increase in wave height. When the wave height increases from 0.0 m to 0.05 m, the peak value decreases by about 45%. For all conditions, regardless of wave phases or wave heights, the peak of the drag coefficient of the second projectile is obviously much lower than that of the first projectile. Accordingly, the decrease in the velocity of the second projectile is far slower than that of the first one. Negative values of the drag coefficient on the second projectile are observed when the second projectile enters the cavity of the first one.

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Section: Introductionmentioning

confidence: 99%

Effect of Wave Phases and Heights on Supercavitation Flow Field and Dynamic Characteristics of Successively Fired High-Speed Projectiles

Zhang

Wang

Jia

2023

JMSE

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“…Until the present paper, numerical methods to solve the variable-density artificialcompressibility equations have not been implemented on 3D unstructured meshes. They have been implemented on 2D structured meshes [19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36], 3D structured meshes [17,37,38,39], and 2D unstructured meshes [40]. While most of these papers use the Cartesian cut-cell method to model simple obstacles, an implementation on 3D unstructured meshes is needed for more complex geometries.…”

Section: Introductionmentioning

confidence: 99%

Artificial Compressibility with Riemann Solvers: Convergence of Limiters on Unstructured Meshes

2022

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Free-surface flows and other variable density incompressible flows have numerous important applications in engineering.One way such flows can be modelled is to extend established numerical methods for compressible flows to incompressible flows using the method of artificial compressibility. Artificial compressibility introduces a pseudo-time derivative for pressure and, in each real-time step, the solution advances in pseudo-time until convergence to an incompressible limit - a fundamentally different approach than SIMPLE, PISO, and PIMPLE, the standard methods used in OpenFOAM. Although the artificial compressibility method is widespread in the literature, its application to free-surface flows is not. In this paper, we apply the method to variable density flows on 3D unstructured meshes for the first time, implementing a Godunov-type scheme with MUSCL reconstruction and Riemann solvers, where the free surface gets captured automatically by the contact wave in the Riemann solver. The critical problem in this implementation lies in the slope limiters used in the MUSCL reconstruction step. It is well-known that slope limiters can inhibit convergence to steady state on unstructured meshes; the problem is exacerbated here as convergence in pseudo-time is required not just once, but at every real-time step. We compare the limited gradient schemes included in OpenFOAM with an improved limiter from the literature, testing the solver against dam-break and hydrostatic pressure benchmarks. This work opens OpenFOAM up to the method of artificial compressibility, breaking the mould of PIMPLE and harnessing high-resolution shock-capturing schemes that are easier to parallelise.

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“…W.-H. Wang and Y.-Y. Wang [16] simulated the physical process of a circular cylinder impacting on waves, and the response of lifting cable was obtained. Ryzhakov et al [17] used a Particle Finite Element Method (PFEM) for simulations of the sea-landing of an unmanned aerial vehicle (UAV).…”

Section: Introductionmentioning

confidence: 99%

A Numerical Approach to the Dynamic Response of the Deployment System during a Circular Cylinder Crossing through the Wave Zone

Cai

Jiang

2017

Shock and Vibration

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The dynamic response of the deployment system while deploying a circular cylinder crossing wave surface and the following submerging process are investigated numerically. The present numerical approach is based on the combination of solution methods of cable dynamics and computational fluid dynamics (CFD). For the implementation of the numerical approach, a cosimulation platform based on a CFD code and MATLAB is developed to study the fluid-solid interaction problem in the process. To generate regular waves, a numerical wave tank is built based on a piston-type wave generation method and a wave damping method applying porous media. Numerical simulations are performed based on the cosimulation platform. The sensitivities of cable tension, velocity, and acceleration of deployed body to different input parameters are investigated, including phase angles, wave heights, and periods of regular waves and deploying velocities, and the effects of those input parameters on dynamic responses of the deployment system are also discussed.

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An essential solution of water entry problems and its engineering applications

Cited by 8 publications

References 13 publications

Effect of Wave Phases and Heights on Supercavitation Flow Field and Dynamic Characteristics of Successively Fired High-Speed Projectiles

Effect of Wave Phases and Heights on Supercavitation Flow Field and Dynamic Characteristics of Successively Fired High-Speed Projectiles

Artificial Compressibility with Riemann Solvers: Convergence of Limiters on Unstructured Meshes

A Numerical Approach to the Dynamic Response of the Deployment System during a Circular Cylinder Crossing through the Wave Zone

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