Ship shock modeling and simulation for far-field underwater explosion

Shin, Young Sik

doi:10.1016/j.compstruc.2004.03.075

Cited by 123 publications

(31 citation statements)

References 4 publications

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“…For example, dynamical response of a concrete dam subjected to underwater contact explosion has numerically investigated by Yu (2009) or ship shock modeling under far-field underwater explosion by Shin (2004). Although experimental works have down in this field such as Ghanaat et al (1992).…”

Section: Introductionmentioning

confidence: 97%

Dynamic adaptive finite element analysis of acoustic wave propagation due to underwater explosion for fluid-structure interaction problems

Emamzadeh

Ahmadi

Mohammadi

et al. 2015

J. Marine. Sci. Appl.

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In this paper, an investigation into the propagation of far field explosion waves in water and their effects on nearby structures are carried out. For the far field structure, the motion of the fluid surrounding the structure may be assumed small, allowing linearization of the governing fluid equations. A complete analysis of the problem must involve simultaneous solution of the dynamic response of the structure and the propagation of explosion wave in the surrounding fluid. In this study, a dynamic adaptive finite element procedure is proposed. Its application to the solution of a 2D fluid-structure interaction is investigated in the time domain. The research includes: a) calculation of the far-field scatter wave due to underwater explosion including solution of the time-depended acoustic wave equation, b) fluid-structure interaction analysis using coupled Euler-Lagrangian approach, and c) adaptive finite element procedures employing error estimates, and re-meshing. The temporal mesh adaptation is achieved by local regeneration of the grid using a time-dependent error indicator based on curvature of pressure function. As a result, the overall response is better predicted by a moving mesh than an equivalent uniform mesh. In addition, the cost of computation for large problems is reduced while the accuracy is improved.

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Section: Introductionmentioning

confidence: 97%

Dynamic adaptive finite element analysis of acoustic wave propagation due to underwater explosion for fluid-structure interaction problems

Emamzadeh

Ahmadi

Mohammadi

et al. 2015

J. Marine. Sci. Appl.

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“…A twin-hull vessel with slender hulls was found to be stable and had good performance features (Dubrovsky and Lyakhovitsky 2001). Surface ship shock simulation including an underwater explosion (UNDEX) is generally complicated by free-surface effects such as surface reflection waves resulting in bulk cavitation (Shin 2004). In addition, there are phenomena such as hull cavitation, gas bubble oscillation and migration towards the free surface and cavitation closure pulses (Shin 2004).…”

Section: Introductionmentioning

confidence: 99%

Simulation of dynamic behaviour of high-speed catamaran craft subjected to underwater explosion

Chung

Shin

2013

Ships and Offshore Structures

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In recent years, shock trials for surface ships have been conducted in many countries for qualification of ship integrity, systems and subsystems in response to shock. A ship trial identifies design and construction deficiencies that negatively impact ship and crew survivability. Such a trial also validates shock hardening and performance of shipboard equipments. However, livefire ship shock trials and underwater explosion testing are both complex and expensive. As a possible alternative, numerical modelling and simulation may provide viable information on the details of dynamic characteristics of ships, including at the component and sub-component levels. Ship shock analyses were conducted using a finite-element-based coupled catamarantype ship with a fluid model. This model is also applicable to underwater explosion (UNDEX) simulation for movements of a high-speed catamaran-type ship. Catamaran-type ship shock modelling and simulation were performed and the simulation results were compared with the empirical data. The high-speed catamaran-type ship shock analysis approach is presented and the important parameters are discussed.

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“…In experiments, ultrafast diagnostic methods are needed in order to characterize the fluid and solid dynamics simultaneously (Espinosa et al, 2006;Giordano et al, 2005). In simulations, strategies to take the effects of coupling between the fluid and the solid phase have been developed (Shin, 2004;Giordano et al, 2005;Young et al, 2009) and are available in many different simulation packages.…”

Section: Introductionmentioning

confidence: 99%

Investigation of shock wave focusing in water in a logarithmic spiral duct, Part 1: Weak coupling

2015

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a b s t r a c tShock focusing in water is a phenomenon that can occur during the impact of a shock wave generated by an underwater explosion onto any type of convergent marine structures. To predict the dynamic material response of the marine structure, it is important to understand the shock wave dynamics during the focusing event. In this paper, both experimental investigations and numerical studies of twodimensional shock focusing in water are presented. Here, a convergent geometry given by a logarithmic spiral curve is used to focus the shock waves. In the experiments, the interaction between three types of materials and the shock wave in water is explored by using high-speed photography. Distinct features of such flows are unveiled. Three scenarios have been considered in simulations: a rigid structure where only the water-filled region is taken into account, a fluid-structure interaction problem in which the surrounding material responses are included, and an axisymmetric simulation to determine the threedimensional effects.

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Ship shock modeling and simulation for far-field underwater explosion

Cited by 123 publications

References 4 publications

Dynamic adaptive finite element analysis of acoustic wave propagation due to underwater explosion for fluid-structure interaction problems

Dynamic adaptive finite element analysis of acoustic wave propagation due to underwater explosion for fluid-structure interaction problems

Simulation of dynamic behaviour of high-speed catamaran craft subjected to underwater explosion

Investigation of shock wave focusing in water in a logarithmic spiral duct, Part 1: Weak coupling

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