Fully nonlinear 3D interaction of bubble dynamics and a submerged or floating structure

Zong, Zhi; Wang, Jiaxia; Zhou, Li; Zhang, Gui-yong

doi:10.1016/j.apor.2015.09.011

Cited by 36 publications

(9 citation statements)

References 31 publications

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“…Theoretical analysis [11], model testing [1,2,[12][13][14], and numerical analysis [13,[15][16][17][18][19][20] are three main methods for studying the underwater explosion problems. Extensive researches have been accomplished on bubble dynamics.…”

Section: Introductionmentioning

confidence: 99%

The Nonlinear Coupling of Oscillating Bubble and Floating Body with Circular Hole

Minghe¹,

Liu²,

Ren³

et al. 2021

Computer Modeling in Engineering &Amp; Sciences

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The fluid-structure interaction of the oscillating bubble and floating body with circular hole is essentially the nonlinear coupling problem among the incomplete movable boundary, free surface and bubble. This problem is particularly complicated in bubble dynamics. Combined with the volume of fluid method, the Eulerian finite element method is employed to deal with the fluid movement. Based on the improved penalty immersed boundary method, the transient axisymmetric numerical model is established in this paper, considering the fluid-structure interaction effect. The results of simulation are consistent with those of the electric discharge bubble experiment and explosion experiment. Subsequently, considering the influence of the hole size, floating body density, explosive location, and buoyancy, this complex fluid-structure interaction problem is analyzed systematically. Through numerical simulation, we get some new conclusions. When the radius of the hole R h less than the maximum radius of the oscillating bubble, the changes in the whole system are incredibly intense, and the free surface crushing will emerge. The energy of the bubble acts more on the radial direction of the floating body, when the explosive location parameter is small. When the floating body has the same density as the water, the multiple spike skirt is displayed vividly. And the buoyancy of fluid can produce a lifting effect on the floating body.

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Section: Introductionmentioning

confidence: 99%

The Nonlinear Coupling of Oscillating Bubble and Floating Body with Circular Hole

Minghe¹,

Liu²,

Ren³

et al. 2021

Computer Modeling in Engineering &Amp; Sciences

View full text Add to dashboard Cite

show abstract

“…Thus the prediction of the nonlinear interaction and coalescence of two bubbles requires three-dimensional modelling. Numerous studies have been conducted on single bubble dynamics under different boundary conditions using 3D BIM [28][29][30][31][32][33][34][35] . However, the complex topological treatment during bubble coalescence renders the development of a 3D model difficult.…”

Section: Introductionmentioning

confidence: 99%

A three-dimensional modeling for coalescence of multiple cavitation bubbles near a rigid wall

Tao

2019

Physics of Fluids

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Boundary Integral Method (BIM) has been widely and successfully applied to cavitation bubble dynamics, however, the physical complexities involved in the coalescence of multiple bubbles are still challenging for numerical modelling. In this study, an improved three-dimensional (3D) BIM model is developed to simulate the coalescence of multiple cavitation bubbles near a rigid wall, including an extreme situation when cavitation bubbles are in contact with the rigid wall. As the first highlight of the present model, a universal topological treatment for arbitrary coalescence is proposed for 3D cases, combined with a density potential method and an adaptive remesh scheme to maintain a stable and high-accuracy calculation. Modelling for the multiple bubbles attached to the rigid boundary is the second challenging task of the present study. The effects of the rigid wall are modelled using the method of image, thus the boundary value problem is transformed to the coalescence of real bubbles and their images across the boundary. Additionally, the numerical difficulties associated with the splitting of a toroidal bubble and self-coalescence due to the self-film-thinning process of a coalesced bubble are successfully overcome. The present 3D model is verified through convergence studies and further validated by the purposely conducted experiments. Finally, representative simulations are carried out to elucidate the main features of a coalesced bubble near a rigid boundary and the flow fields are provided to reveal the underlying physical mechanisms.

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“…The combination of a free surface and an adjacent bubble may lead to more complex phenomena and this physical process is crucial to underwater explosions and seabed exploration. It is well known that the "whipping effect" is triggered when the oscillation frequency of a nearby underwater explosion bubble matches the resonance frequency of a naval ship (or a submarine) (Zhang and Zong, 2011;Zong et al, 2015). In the seabed exploration field, the bubble oscillation frequency or period is directly associated with the characteristics of the emitted sound wave, which is desired to contain more energy in the lowfrequency part (de Graaf et al, 2014;Zhang et al, 2018).…”

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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Fully nonlinear 3D interaction of bubble dynamics and a submerged or floating structure

Cited by 36 publications

References 31 publications

The Nonlinear Coupling of Oscillating Bubble and Floating Body with Circular Hole

The Nonlinear Coupling of Oscillating Bubble and Floating Body with Circular Hole

A three-dimensional modeling for coalescence of multiple cavitation bubbles near a rigid wall

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

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