Abstract
Underwater explosions are very complicated problem possessing many challenges for numerical modeling. In the present paper, a two-dimensional underwater explosion near a free surface and a structural object is numerically investigated using a 6-equation diffuseinterface model that is solved by a HLLC-type scheme with MUSCL-Hancock method based on the least-squares reconstruction and Barth and Jespersen’s limiter on quadrilateral unstructured grid. A long-time computation is performed to capture the important physics of the underwater explosion: initial underwater shock propagation and its interaction with material interfaces, expansion and contraction of the explosive gas bubble, and water jetting near a structure on the collapse of the gas bubble. These phenomena are clearly observed by the appropriate flow visualization of the computed results.
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