The response of underwater structures to a near-field explosion is coupled with the dynamics bubble and surrounding water. This multiphase fluid–structure interaction process investigated in paper using two-dimensional model problem that features yielding collapse thin-walled aluminum cylinder. A recently developed computational framework couples finite volume compressible fluid solver element ...

The shock wave characteristics within the near-field are one of most challenging aspects understanding an underwater explosion. latest numerical and experimental techniques were utilized to investigate pressure distribution decay features after a disturbance. governing equations in simulation discretized with fifth-order weighted essentially non-oscillatory scheme space third-order Runge–Kutta ...

A model of formation, development, and acoustic properties of the bubble cloud resulting from an underwater explosion is presented. The model includes several parts: explosion globe dynamics, initial break-up of the explosion globe, turbulence created by the explosion globe fragmentation, and further break-up of the bubbles by the turbulence. The time history of the bubble cloud properties is c...

Abstract The local structure of the cylindrical shell produces plastic deformation under near-field underwater explosion load, based on fact that ring rib is strong support reinforced plate, this paper simplifies model into a rigid slatted beam at both ends, and lists equations beams action shock wave bubble pulsation load. This equation takes initial damage caused by account, compares calculat...

Underwater explosions are tremendously hazardous for floating structures and human life inside. When compared to an air blast, underwater blast is more effective due the effect of fluid domain. Therefore, design marine with high strength a difficult subject as well important. With rapid progression material technology, composite materials widely preferred over metals in fields defense industrie...

In this paper, the dynamic behavior of square plates with various thicknesses and stiffening configurations subjected to underwater explosion (UNDEX) are evaluated through a relatively novel approach which is called Incremental Explosive Analysis (IEA). The IEA estimates the different limit-states and deterministic assessment of plats’ behavior, considering uncertainty of loading conditions and...

A behavioral response paradigm was used to measure masked underwater hearing thresholds in two bottlenose dolphins and one beluga whale before and after exposure to impulsive underwater sounds with waveforms resembling distant signatures of underwater explosions. An array of piezoelectric transducers was used to generate impulsive sounds with waveforms approximating those predicted from 5 or 50...

Adaptive solution techniques are presented for simulating underwater explosions and implosions. The liquid is assumed to be an adiabatic fluid and the solution in the gas is assumed to be uniform in space. The solution in the water is integrated in time using a semi-implicit time discretization of the adiabatic Euler equations. Results are presented either using a non-conservative semi-implicit...