Multiphase phenomena in underwater explosion

Petrov, Nikita; Schmidt, A. A.

doi:10.1016/j.expthermflusci.2014.05.008

Cited by 31 publications

(7 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(9-10). (Petrov and Schmidt, 2015;Daramizadeh and Ansari, 2015;Xu et al, 2020). However, there is minimal focus on subsequent 90 surface waves, let alone relations tested for their generation mechanisms or far-field propagation.…”

Section: Underwater Eruption Modelmentioning

confidence: 99%

Multilayer modelling of waves generated by explosive submarine volcanism

Hayward

Whittaker

Lane

et al. 2021

Preprint

View full text Add to dashboard Cite

Abstract. Theoretical source models of underwater explosions are often applied in studying tsunami hazards associated with submarine volcanism; however, their use in numerical codes based on the shallow water equations can neglect the significant dispersion of the generated wavefield. A non-hydrostatic multilayer method is validated against a laboratory-scale experiment of wave generation from instantaneous disturbances and at field-scale submarine explosions at Mono Lake, California, utilising the relevant theoretical models. The numerical method accurately reproduces the range of observed wave characteristics for positive disturbances and suggests a previously unreported relationship of extended initial troughs for negative disturbances at low dispersivity and high nonlinearity parameters. Satisfactory amplitudes and phase velocities within the initial wave group are found using underwater explosion models at Mono Lake. The scheme is then applied to modelling tsunamis generated by volcanic explosions at Lake Taupō, New Zealand, for a magnitude range representing ejecta volumes between 0.04–0.4 km3. Waves reach all shores within 15 minutes with maximum incident crest amplitudes around 4 m at shores near the source. This work shows that the multilayer scheme used is computationally efficient and able to capture a wide range of wave characteristics, including dispersive effects, which is necessary when investigating submarine explosions. This research therefore provides the foundation for future studies involving a rigorous probabilistic hazard assessment to quantify the risks and relative significance of this tsunami source mechanism.

show abstract

Section: Underwater Eruption Modelmentioning

confidence: 99%

Multilayer modelling of waves generated by explosive submarine volcanism

Hayward

Whittaker

Lane

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Purely Lagrangian techniques have also been effectively used to numerically reproduce UNDEX, such as in Ming et al [18], where a faithful fracture pattern on metallic panels was achieved, and Zhang et al [52], where the penetration of metal jet on steel plates was accurate, thus, proving the interfacial efficiency of this method. Aiming to supply the faults and couple the benefits of both methods, ALE has also been applied by authors like Jafarian et al [53] to allow the simulation of UNDEX compressible flow and cavitation (formation, development, and collapse of bubbles), using a single fluid by Petrov et al [54] to take into account cavitation and rarefaction waves that propagate through the liquid, and by Wardlaw [55] to validate simulations at one, two, and three dimensions and with a variable number of moving boundaries.…”

Section: Fluid Description Algorithmsmentioning

confidence: 99%

Survey on Experimental and Numerical Approaches to Model Underwater Explosions

Camargo

2019

JMSE

View full text Add to dashboard Cite

The ability of predicting material failure is essential for adequate structural dimensioning in every mechanical design. For ships, and particularly for military vessels, the challenge of optimizing the toughness-to-weight ratio at the highest possible value is essential to provide agile structures that can safely withstand external forces. Exploring the case of underwater explosions, the present paper summarizes some of the fundamental mathematical relations for foreseeing the behavior of naval panels to such solicitation. A broad state-of-the-art survey links the mechanical stress-strain response of materials and the influence of local reinforcements in flexural and lateral-torsional buckling to the hydrodynamic relations that govern the propagation of pressure waves prevenient from blasts. Numerical simulation approaches used in computational modeling of underwater explosions are reviewed, focusing on Eulerian and Lagrangian fluid descriptions, Johnson-Cook and Gurson constitutive materials for naval panels, and the solving methods FEM (Finite Element Method), FVM (Finite Volume Method), BEM (Boundary Element Method), and SPH (Smooth Particle Hydrodynamics). The confrontation of experimental tests for evaluating different hull materials and constructions with formulae and virtual reproduction practices allow a wide perception of the subject from different yet interrelated points of view.

show abstract

“…However, at the next interface, the shock wave transmits from the inside of the outer shell to the water in case a while from the inside to the air in case b. Because the acoustic impedances of water and air are much lower than that of steel, there is a rarefaction wave reflected at this interface [47][48][49][50][51]. erefore, the intensity of the incident shock wave is unloaded.…”

Section: Shock Wave Reflectionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

Multiphase phenomena in underwater explosion

Cited by 31 publications

References 6 publications

Multilayer modelling of waves generated by explosive submarine volcanism

Multilayer modelling of waves generated by explosive submarine volcanism

Survey on Experimental and Numerical Approaches to Model Underwater Explosions

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

Contact Info

Product

Resources

About