Eulerian Finite-Difference Calculations of Explosions in Partially Water-Filled Overstrong Cylindrical Containment Vessels.

摘要

Calculations,using the two-dimensional Eulerian finite-difference code CSQ,were performed for the problem of a small spherical high-explosive charge detonated in a closed heavy-walled cylindrical container partially filled with water. Data from corresponding experiments,specifically performed to validate codes used for hypothetical core disruptive accidents of liquid metal fast breeder reactors,are available in the literature. The calculations were performed specifically to test whether Eulerian methods could handle this type of problem,to determine whether water cavitation,which plays a large role in the loadings on the roof of the containment vessel,could be described adequately by an equilibrium liquid-vapor mixed phase model,and to investigate the trade-off between accuracy and cost of the calculations by using different sizes of computational meshes. Comparison of the experimental and computational data shows that the Eulerian method can handle the problem with ease,giving good predictions of wall and floor loadings. While roof loadings are qualitatively correct,peak impulse appears to be affected by numerical resolution and is underestimated somewhat. (ERA citation 03:024061)