Numerical Research on Near-free Surface Underwater Explosion Bubble Characteristics in Different Fluid Media Considering Viscosity Effects

Abstract

Previous studies on explosion bubbles mainly focused on single-fluid media, such as air, water, and silicone oil and rarely considered the effect of viscosity on bubble pulsation. This research was conducted to establish a robust numerical model to describe underwater explosions near the free surface based on the coupled Eulerian–Lagrangian method of ABAQUS, in which the bubble dynamics were studied using two media bubbles: traditional water and silicone oil with various viscosities. An electric spark bubble model test was performed to verify the accuracy of the numerical model. Finally, several key parameters were selected as independent variables: the explosion point to the distance from the interface, the different explosion points to the distance from the interface and free surface distance and viscosity under the bubble pulsation process during water mound formation (the raised part of the water surface caused by explosion) mechanics. Afterward, some kinetic parameters, including bubble radius, pulsation period, water mound apex displacement, and velocity, were discussed in detail, which may provide an effective way for the enrichment of the application of numerical simulation technology in bubble dynamics.

Keywords

Explosion bubble / Viscous fluid / CEL method / Multiple media

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Harbin Engineering University and Springer-Verlag GmbH Germany, part of Springer Nature