Investigation on charge parameters of underwater contact explosion based on axisymmetric SPH method

明付仁,; 孙鹏楠,; 张阿漫,

doi:10.1007/s10483-014-1804-6

Cited by 15 publications

(4 citation statements)

References 21 publications

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“…The discretized form of equation (8) by using SPH particles is represented as (9) where m is the particle mass, j is the neighboring particle, N is the number of neighbors, and is defined as the 2D plane density under a cylindrical coordinate. The first derivative of equation 9is calculated as (10) By using relevant SPH principles, the second term on RHS of equation 5 On the other hand, the RHS of equation (6) can be written in the SPH discretized form as (13) Further considering (14) with combining equations (13) and (14) to obtain (15) Similar derivations can also be applied to the RHS of equation 7to reach (16) Therefore, the SPH momentum equations under a cylindrical coordinate become…”

Section: Sph Formulations In Cylindrical Coordinatementioning

confidence: 99%

“…By this formulation they studied the problem of two colliding spherical shocks using a variable SPH particle resolution. Ming et al [16] further expanded the study of Omang et al [15] and investigated the effect of charge parameters on an underwater contact explosion. In their study, a dynamic boundary particle approach was proposed to improve the pressure computations near the symmetric axis.…”

Section: Introductionmentioning

confidence: 99%

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Cylindrical Smoothed Particle Hydrodynamics Simulations of Water Entry

Gong

Shao

Liu

et al. 2019

Journal of Fluids Engineering

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This paper presents a smoothed particle hydrodynamics (SPH) modeling technique based on the cylindrical coordinates for axisymmetrical hydrodynamic applications, thus to avoid a full three-dimensional (3D) numerical scheme as required in the Cartesian coordinates. In this model, the governing equations are solved in an axisymmetric form and the SPH approximations are modified into a two-dimensional cylindrical space. The proposed SPH model is first validated by a dam-break flow induced by the collapse of a cylindrical column of water with different water height to semi-base ratios. Then, the model is used to two benchmark water entry problems, i.e., cylindrical disk and circular sphere entry. In both cases, the model results are favorably compared with the experimental data. The convergence of model is demonstrated by comparing with the different particle resolutions. Besides, the accuracy and efficiency of the present cylindrical SPH are also compared with a fully 3D SPH computation. Extensive discussions are made on the water surface, velocity, and pressure fields to demonstrate the robust modeling results of the cylindrical SPH.

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Section: Sph Formulations In Cylindrical Coordinatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cylindrical Smoothed Particle Hydrodynamics Simulations of Water Entry

Gong

Shao

Liu

et al. 2019

Journal of Fluids Engineering

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“…erefore, knowledge on the pressure characteristics of shock waves is of particular importance to an overall understanding of the shock resistance of submarines. Although numerous studies have been conducted [2][3][4][5], there are still many tough problems to solve due to the violent interactions between the structure and the shock wave, especially for the understanding of the wave propagation in multilayer structures. Among them, the double-layer hemispherical shell is often used as the protective structure of submarines and other underwater vehicles.…”

Section: Introductionmentioning

confidence: 99%

Study on the Pressure Characteristics of Shock Wave Propagating across Multilayer Structures during Underwater Explosion

Meng

Cao

Ming

et al. 2019

Shock and Vibration

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e propagation of the shock wave across multilayer structures during underwater explosion is a very complex physical phenomenon, involving violent fluid-structure interaction (FSI) problems. In this paper, the coupled Eulerian-Lagrangian (CEL) method in AUTODYN is used to simulate the process of shock wave propagation and solve FSI problems. Firstly, the governing equation and the treatment of fluid and structure interface of the CEL method are briefly reviewed. Afterwards, two underwater explosion numerical models are established, and the results are compared with the empirical formula and experimental data, respectively, to verify the reliability of numerical solutions. e results obtained by this method show good agreements with those of the empirical formula and experiment. Furthermore, the model of the multilayer structures composed of two hemispherical shells and the fluid filled between the shells subjected to underwater explosion is established, and the pressure characteristics of the shock wave propagating across the multilayer structures are analyzed regarding the wave reflection and transmission. Finally, the effects of the shell thickness and the filled fluid type among the multilayer structures on the wave reflection and transmission are studied.

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“…Since these particles can move within the computational domain in the Lagrangian frame, SPH is an attractive tool to model complex flows with free surfaces, moving interfaces and large deformations which are difficult for grid-based methods. Though the SPH has a very wide range of applications in incompressible flows, [20][21][22] applications in heat transfer problems are still not mature enough.…”

Section: Introductionmentioning

confidence: 99%

Improved kernel gradient free-smoothed particle hydrodynamics and its applications to heat transfer problems

Lei

Xueying

2016

Chinese Phys. B

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Kernel gradient free-smoothed particle hydrodynamics (KGF-SPH) is a modified smoothed particle hydrodynamics (SPH) method which has higher precision than the conventional SPH. However, the Laplacian in KGF-SPH is approximated by the two-pass model which increases computational cost. A new kind of discretization scheme for the Laplacian is proposed in this paper, then a method with higher precision and better stability, called Improved KGF-SPH, is developed by modifying KGF-SPH with this new Laplacian model. One-dimensional (1D) and two-dimensional (2D) heat conduction problems are used to test the precision and stability of the Improved KGF-SPH. The numerical results demonstrate that the Improved KGF-SPH is more accurate than SPH, and stabler than KGF-SPH. Natural convection in a closed square cavity at different Rayleigh numbers are modeled by the Improved KGF-SPH with shifting particle position, and the Improved KGF-SPH results are presented in comparison with those of SPH and finite volume method (FVM). The numerical results demonstrate that the Improved KGF-SPH is a more accurate method to study and model the heat transfer problems.

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Investigation on charge parameters of underwater contact explosion based on axisymmetric SPH method

Cited by 15 publications

References 21 publications

Cylindrical Smoothed Particle Hydrodynamics Simulations of Water Entry

Cylindrical Smoothed Particle Hydrodynamics Simulations of Water Entry

Study on the Pressure Characteristics of Shock Wave Propagating across Multilayer Structures during Underwater Explosion

Improved kernel gradient free-smoothed particle hydrodynamics and its applications to heat transfer problems

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