Nonlinear interaction between underwater explosion bubble and structure based on fully coupled model

Zhang, A-Man; Wu, W.B.; Liu, Yunlong; Wang, Qianxi

doi:10.1063/1.4999478

Cited by 66 publications

(8 citation statements)

References 44 publications

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“…Slifko [5] carried out in-depth experimental research on the pressure characteristics of explosive shock wave in the infinite water medium and revealed the relationship between the pressure of underwater shock wave and water depth. Aiming at the unique dynamic behavior of underwater explosion, Yao [6] and Zhang [7] investigated the dynamic behavior of bubbles under different boundary conditions. e large-equivalent charge test for underwater explosions is restricted by environmental factors.…”

Section: Introductionmentioning

confidence: 99%

Similarity Law between Centrifuge Scale Test and Prototype Underwater Explosion

Chen²,

Wang

et al. 2021

Shock and Vibration

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Shock wave and bubble pulsation caused by underwater explosion destroy the hydraulic structure. However, the realization of the underwater explosion prototype test is restricted by many factors, such as the site environment. Furthermore, the repeatability of the test scheme is not strong. The centrifuge scale test provides a new way of studying the damage degree of the structure under the action of underwater explosion. The similarity relationship refers to the bridge between the scaled model and the prototype, which cannot achieve complete similarity in practice. The centrifuge-scaled model test is performed by increasing the acceleration of a certain multiple. Meanwhile, the model reduces the corresponding ratio in the geometric layout to achieve the geometric similarity with the prototype test. Therefore, the applicability of the centrifuge scaling method in the study of the dynamic response of the structure in underwater explosion needs to be explored further. In this work, the underwater explosion scaling test numerical model for 1 g RDX (equivalent to 1.62 g TNT) charge under different centrifugal acceleration conditions is established, and the calculation results of underwater pressure and dynamic response of the steel plate are compared with the centrifuge test results. A prototype model is established to study the similarity relationship between the centrifuge scale test and the prototype model when the steel plate structure is in the stage of small deformation and linear elasticity. The application of the similarity ratio in the scale test of underwater explosion the centrifuge is discussed. The application of the centrifuge in the study of the failure response of the hydraulic structure in underwater explosion is expanded by establishing the model and comparing with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Similarity Law between Centrifuge Scale Test and Prototype Underwater Explosion

Chen²,

Wang

et al. 2021

Shock and Vibration

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“…The underwater explosion load is one of the crucial topics in the study of warship strength. In previous studies, shock wave and explosion bubble have received more attentions, and plenty methods are proposed to solve these problems [Zhang, Wu, Liu et al (2017); Chen, Qiang and Gao (2015); Liu, Zhang and Tian (2014); Wang, Chu and Zhang (2014); Wang (2013); Lee and Keh (2013); Barras, Souli, Aquelet et al (2012); Grenier, Antuono, Colagrossi et al (2009); Geers (1978); Cole (1948)]. The underwater explosion shockwave is so short that usually induces the high frequency responses of the structure and cause local structure failure.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Floating Body Subjected to Underwater Explosion Bubble and Generated Waves with 2D Numerical Model

Tian¹,

Liu²,

Wang³

et al. 2019

Computer Modeling in Engineering &Amp; Sciences

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The low frequency load of an underwater explosion bubble and the generated waves can cause significant rigid motion of a ship that threaten its stability. In order to study the fluid-structure interaction qualitatively, a two-dimensional underwater explosion bubble dynamics model, based on the potential flow theory, is established with a double-vortex model for the doubly connected bubble dynamics simulation, and the bubble shows similar dynamics to that in 3-dimensional domain. A fully nonlinear fluid-structure interaction model is established considering the rigid motion of the floating body using the mode-decomposition method. Convergence test of the model is implemented by simulating the free rolling motion of a floating body in still water. Through the simulation of the interaction of the underwater explosion bubble, the generated waves and the floating body based on the presented model, the influences of the buoyancy parameter and the distance parameter are discussed. It is found that the impact loads on floating body caused by underwater explosion bubble near the free surface can be divided into 3 components: bubble pulsation, jet impact, and slamming load of the generated waves, and the intensity of each component changes nonlinearly with the buoyance parameter. The bubble pulsation load decays with the increase in the horizontal distance. However, the impact load from the generated waves is not monotonous to distance. It increases with the distance within a particular distance threshold, but decays thereafter.

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“…On the basis of this model, Li et al [27,28] applied the BEM to study bubble behavior near a free surface and a rigid body. Zhang et al [29][30][31][32] investigated bubble dynamics near different boundaries with the BEM, and the obtained numerical results were compared with experimental data to verify the validity of the computational method. The BEM is effective to simulate bubble dynamics; however, additional numerical techniques should be used with the BEM model to simulate a process of jet formation.…”

Section: Introductionmentioning

confidence: 99%

SPH-BEM simulation of underwater explosion and bubble dynamics near rigid wall

Zhang

Wang

Zhang

et al. 2019

Sci. China Technol. Sci.

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A process of underwater explosion of a charge near a rigid wall includes three main stages: charge detonation, bubble pulsation and jet formation. A smoothed particle hydrodynamics (SPH) method has natural advantages in solving problems with large deformations and is suitable for simulation of processes of charge detonation and jet formation. On the other hand, a boundary element method (BEM) is highly efficient for modelling of the bubble pulsation process. In this paper, a hybrid algorithm, fully utilizing advantages of both SPH and BEM, was applied to simulate the entire process of free and near-field underwater explosions. First, a numerical model of the free-field underwater explosion was developed, and the entire explosion processfrom the charge detonation to the jet formation-was analysed. Second, the obtained numerical results were compared with the original experimental data in order to verify the validity of the presented method. Third, a SPH model of underwater explosion for a column charge near a rigid wall was developed to simulate the detonation process. The results for propagation of a shock wave are in good accordance with the physical observations. After that, the SPH results were employed as initial conditions for the BEM to simulate the bubble pulsation. The obtained numerical results show that the bubble expanded at first and then shrunk due to a differences of pressure levels inside and outside it. Here, a good agreement between the numerical and experimental results for the shapes, the maximum radius and the movement of the bubble proved the effectiveness of the developed numerical model. Finally, the BEM results for a stage when an initial jet was formed were used as initial conditions for the SPH method to simulate the process of jet formation and its impact on the rigid wall. The numerical results agreed well with the experimental data, verifying the feasibility and suitability of the hybrid algorithm. Besides, the results show that, due to the effect of the Bjerknes force, a jet with a high speed was formed that may cause local damage to underwater structures.

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Nonlinear interaction between underwater explosion bubble and structure based on fully coupled model

Cited by 66 publications

References 44 publications

Similarity Law between Centrifuge Scale Test and Prototype Underwater Explosion

Similarity Law between Centrifuge Scale Test and Prototype Underwater Explosion

Dynamic Response of Floating Body Subjected to Underwater Explosion Bubble and Generated Waves with 2D Numerical Model

SPH-BEM simulation of underwater explosion and bubble dynamics near rigid wall

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