Hydrodynamic impact analysis. Interim report. [BWR]

The STEALTH computer code has been used to analyze the transient hydrodynamic impact of a long rigid cylinder on a large water pool. STEALTH is an explicit finite-difference computer program written in a Lagrangian formulation. The calculations reported here used the two-dimensional version of the code in a plane strain (translational symmetry) geometry. Important features of the calculations include a sophisticated capture logic which controls the impact and subsequent motion of mesh points which hit the cylinder, and a rezoning capability to limit mesh distortions. Impact velocities of 7.65 ft/sec and 24.2 ft/sec were considered. The results of these calculations compare closely with experimental data from pool impact tests performed by Developmental Sciences, Incorporated.