A Detailed Comparison of 3-D Hydrocode Computations for Shock Diffraction Loading on an S-280 Electrical Equipment Shelter

摘要

The normal shock diffraction loading on an S-280 Electrical Equipment Shelter (essentially a rectangular parallelepiped) by a 34.5 kPa (5.0 psi) shock is reported. Two different three-dimensional hydrodynamic computer codes, BAAL from the Los Alamos Scientific Laboratory and HULL from the Air Force Weapons Laboratory, were used. The results from the two hydrocodes are compared with one another, showing good agreement, and with two existing semiempirical models. Improvements to these models are suggested, as the computed results indicate that the net loading for this three-dimensional shelter is significantly lower than the models predict. The effects of artificial viscosity in the hydrocodes and of the smearing of the computational shock in the finite difference grid are also discussed. (Author)