Study on the interactions between two identical oscillation bubbles and a free surface in a tank

Liu, N. N.; Cui, Pu; Ren, Shiquan; Zhang, A. M.

doi:10.1063/1.4984080

Cited by 43 publications

(12 citation statements)

References 48 publications

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“…the crown, is put into question by the work of Han, Zhang & Li (2014) and Liu et al. (2017), who both used an incompressible boundary element method (BEM) to study similar configurations. Owing to the challenges that the BEM encounters in simulating the bubble after it breaks into a toroid, the former authors simply removed the toroidal bubble.…”

Section: Introductionmentioning

confidence: 99%

“…On the subject of crown formation, they write: ‘when the toroidal bubble starts to rebound, the pushing effect from the rebounding bubble, similar to the effect from the initial expanding bubble, tends to induce the upward deformation of the free surface again, which is the cause of the secondary spike.’ They add: ‘since [Liu et al. (2017)] ignored the compressibility of the water, acoustic emissions were absent in their simulation. Therefore, we argue that the acoustic emissions are not important in the formation of the crown spike.’ Beyond these statements, however, they did not provide any quantitative evidence of the role of compressibility.…”

Section: Introductionmentioning

confidence: 99%

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Crown formation from a cavitating bubble close to a free surface

et al. 2021

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A rapidly growing bubble close to a free surface induces jetting: a central jet protruding outwards and a crown surrounding it at later stages. While the formation mechanism of the central jet is known and documented, that of the crown remains unsettled. We perform axisymmetric simulations of the problem using the free software program BASILISK, where a finite-volume compressible solver has been implemented, which uses a geometric volume-of-fluid (VoF) method for the tracking of the interface. We show that the mechanism of crown formation is a combination of a pressure distortion over the curved interface, inducing flow focusing, and of a flow reversal, caused by the second expansion of the toroidal bubble that drives the crown. The work culminates in a parametric study with the Weber number, the Reynolds number, the pressure ratio and the dimensionless bubble distance to the free surface as control parameters. Their effects on both the central jet and the crown are explored. For high Weber numbers, we observe the formation of weaker ‘secondary crowns’, highly correlated with the third oscillation cycle of the bubble.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crown formation from a cavitating bubble close to a free surface

et al. 2021

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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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“…Pearson et al (2004) improved the model that can accurately capture the evolution of the free surface and the bubble motion. Liu et al (2017) investigated the interaction between two identical oscillating bubbles and a free surface in a confined domain. Three-dimensional configurations were also considered in Han et al (2014); Li and Ni (2016); Wang and Khoo (2004); .…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the dynamics of a coalesced oscillating bubble near a free surface

et al. 2019

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Understanding the dynamics of oscillating bubbles beneath a free surface is crucial to many practical applications including airgun-bubble clusters, underwater explosions, etc. In this paper, an experimental and numerical study of the dynamic behaviors of a coalesced bubble near a free surface is conducted, which shows quite different physical features from single bubble dynamics. Firstly, two similar sized underwater discharge bubbles are generated simultaneously beneath a free surface and their complex interactions are experimentally studied with high-speed photography imaging. A strong interaction between two bubbles and the subsequent coalescence are observed when the initial distance between two bubbles is smaller than the maximum equivalent bubble radius. Secondly, both axisymmetric and three-dimensional (3D) boundary integral models are used to simulate the precoalescence and post-coalescence of two bubbles. The results obtained by the two models agree well in axisymmetric conditions. The essential physical phenomena in representative experiments are well reproduced by the present 3D model. The pressure field is calculated by the auxiliary function method, which helps to reveal the underlying mechanisms of bubble collapse patterns and jetting behaviors. A parametric study reveals the dependence of the coalesced bubble dynamics and free surface motion on the governing dimensionless quantities.

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Study on the interactions between two identical oscillation bubbles and a free surface in a tank

Cited by 43 publications

References 48 publications

Crown formation from a cavitating bubble close to a free surface

Crown formation from a cavitating bubble close to a free surface

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

Experimental and numerical investigation of the dynamics of a coalesced oscillating bubble near a free surface

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