Numerical modeling for compressible two-phase flows and application to near-field underwater explosions

Nguyen, Van-Tu; Phan, Thanh-Hoang; Duy, Trong-Nguyen; Park, Warn-Gyu

doi:10.1016/j.compfluid.2020.104805

Cited by 32 publications

(8 citation statements)

References 42 publications

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“…This work was extended in subsequent research, where the authors developed an Abaqus subroutine to continuously simulate UNDEX physics, validating the subroutine's accuracy through simulations of detonation, bubble dynamics and jetting behaviours (Liu et al 2018a). A two-phase formulation for UNDEX simulation using finite volume differencing and correlations to experimental data for free-field detonations and interactions with rigid bodies were presented in Nguyen et al (2021). Another combined method, integrating the finite volume approach with the volume of fluid techniques for modelling underwater explosion bubble dynamics, was discussed in Li et al (2018), including validation against spherical bubbles and buoyancy-affected bubbles.…”

Section: Explosion and Bubble Dynamics Simulations 5251 Free Fieldmentioning

confidence: 99%

A review of underwater shock and fluid–structure interactions

Matos,

Galuska,

Javier

et al. 2024

Flow

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Underwater explosions are inherently complex and unique physical phenomena markedly distinct from those occurring above the surface. This distinctiveness is primarily attributed to the relatively incompressible nature of water, which fundamentally alters the propagation and impact of shock waves. The study of underwater explosions is paramount in applications such as underwater demolitions for construction and salvage operations. These applications require a comprehensive understanding in order to mitigate the disturbances’ impact on marine structures and ecosystems. Studying underwater explosions and their mitigation encompasses various disciplines, including fluid mechanics, materials science and structural engineering. The work reviewed in this study contributes significantly to enhancing safety measures in marine structures by providing critical insights into the behaviour of structures under extreme conditions. This includes understanding the behaviour of gas bubbles formed by explosions, the transmission of shock waves through different media and the resultant forces exerted on structures submerged in water. Consequently, this review is meant to aid in designing robust and resilient marine systems capable of withstanding severe loading conditions caused by underwater explosions by providing key engineering considerations. The continuous evolution of this research area is essential for advancing maritime technology, ensuring the safety of undersea operations and protecting marine environments from the adverse effects of extreme subaqueous loadings.

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Section: Explosion and Bubble Dynamics Simulations 5251 Free Fieldmentioning

confidence: 99%

A review of underwater shock and fluid–structure interactions

Matos,

Galuska,

Javier

et al. 2024

Flow

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“…2021; Nguyen et al. 2021), air-gun exploration (Ziolkowski et al. 1982; Babak & Martin 2018; Khodabandeloo & Landro 2018; Ziolkowski 2021) and submarine volcanic eruptions (Lyons et al.…”

Section: Introductionmentioning

confidence: 99%

Vertically neutral collapse of a pulsating bubble at the corner of a free surface and a rigid wall

Zhang

Cui

et al. 2023

J. Fluid Mech.

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Vertically neutral collapse of a pulsating bubble occurs when the boundaries above or below the bubble balance the buoyancy effect over a pulsation. In this study, the vertically neutral collapse of a bubble near a vertical rigid wall below the free surface is investigated. The boundary integral method (BIM) is employed to model the bubble dynamics with an open-domain free surface. Moreover, this method is validated against several buoyant bubble experiments. Bubble dynamics in such conditions are associated with three dimensionless parameters: the bubble-free surface distance $\gamma _{{f}}$ , bubble–wall distance $\gamma _{{w}}$ and buoyancy parameter $\delta$ . We derive the Kelvin impulse of a spherical bubble and the algebraic relationship for vertically neutral collapse, which proves to be accurate for predicting vertically neutral collapse when the bubble is relatively far from the boundaries. Four patterns of the vertically neutral collapse of the bubble for different $\gamma _{{w}}$ and $\gamma _{{f}}$ are identified: (i) formally downward jet; (ii) annular collapse; (iii) horizontal jet; and (iv) weak jet. Despite the downward jet shape, the ‘formally downward jet’ is in the vertically neutral collapse state in terms of the profile of toroidal bubbles and the orientation of local high-pressure zones around the bubble at jet impact. A bulge with a high curvature above the bubble in the ‘annular collapse’ pattern is formed during bubble collapse under two local high-pressure zones at the left and right extremities of the bubble. The ‘horizontal jet’ pattern has the greatest potential to attack the wall, and the power laws of the moment of the jet impact, jet velocity and bubble displacement with respect to the theoretical Kelvin impulse are discussed. In particular, we quantitatively illustrate the role of the free surface on bubble migration towards the wall through the variational power-law exponents of the bubble displacement with respect to $\gamma _{{w}}$ .

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“…The underwater explosion near composite structures is studied with a RKDG–FEM approach (Ge et al , 2020). A two-phase model is built in a three-dimensional curvilinear coordinate system to study the near-field UNDEX in the work of Nguyen et al (2021). Although there are studies of UNDEX as well as the interaction between explosion and structure, the numerical model which includes air, water, real explosive material and structure is rarely seen, especially in three-dimensional simulations.…”

Section: Introductionmentioning

confidence: 99%

“…One of the challenging difficulties in solving the compressible flows with sharp interfaces and shock waves is that of strong spurious oscillations of pressure, velocity and temperature which often occurs at the interface (Nguyen et al , 2021). If the solver for the advection equation and the Euler system is not consistent, then strong spurious oscillations will occur (Shyue, 1998).…”

Section: Introductionmentioning

confidence: 99%

An arbitrary Lagrangian–Eulerian method for fluid–structure interactions due to underwater explosions

Löhner

Soto

et al. 2023

HFF

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Purpose This study aims to evaluate blast loads on and the response of submerged structures. Design/methodology/approach An arbitrary Lagrangian–Eulerian method is developed to model fluid–structure interaction (FSI) problems of close-in underwater explosions (UNDEX). The “fluid” part provides the loads for the structure considers air, water and high explosive materials. The spatial discretization for the fluid domain is performed with a second-order vertex-based finite volume scheme with a tangent of hyperbola interface capturing technique. The temporal discretization is based on explicit Runge–Kutta methods. The structure is described by a large-deformation Lagrangian formulation and discretized via finite elements. First, one-dimensional test cases are given to show that the numerical method is free of mesh movement effects. Thereafter, three-dimensional FSI problems of close-in UNDEX are studied. Finally, the computation of UNDEX near a ship compartment is performed. Findings The difference in the flow mechanisms between rigid targets and deforming targets is quantified and evaluated. Research limitations/implications Cavitation is modeled only approximately and may require further refinement/modeling. Practical implications The results demonstrate that the proposed numerical method is accurate, robust and versatile for practical use. Social implications Better design of naval infrastructure [such as bridges, ports, etc.]. Originality/value To the best of the authors’ knowledge, this study has been conducted for the first time.

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Numerical modeling for compressible two-phase flows and application to near-field underwater explosions

Cited by 32 publications

References 42 publications

A review of underwater shock and fluid–structure interactions

A review of underwater shock and fluid–structure interactions

Vertically neutral collapse of a pulsating bubble at the corner of a free surface and a rigid wall

An arbitrary Lagrangian–Eulerian method for fluid–structure interactions due to underwater explosions

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