POINT SOURCE EXPLOSION IN AIR

Using a high speed JOHNNLLC computer and a program which allows the solution of the partial differertial equations governing hydrodynamic motion in spherical geometry, the problem of the blast wave from a point source in air was carried out. The methods are described and the equation of state for air is given. The results of the particular solution for a point source is covered, giving shock values of pressure, density, particle velocity, temperature and dynamic pressure as functions of the shock radius and of the peak overpressure. The time histories of the same variables are given for a number of distances from the source, as well as values of the durations of positive phases and impulses from overpressure and from dynamic pressure. (auth

SPACE PLOTS OF PRESSURE, DENSITY AND PARTICLE VELOCITY FOR THE BLAST WAVE FROM A POINT SOURCE IN AIR

Supplement to AECU-3517, (RM-l824-AECl. Graphs of pressure, density and particle velocity versus radius at specified times throughout the course of an explosion in air originating from an instantaneous release of energy at a point are presented. These curves are basic to the results and analysis reported in RAND Research Memorandum RM-l824-AEC and are published as supplementary reference data for those who have occasion to require more information or detail than is presented in that report. (auth

Free-field blast parameter errors from Cartesian cell representations of bursting sphere-type charges

The bursting sphere model is a simple approach to the numerical simulation of blast from charge detonation. It involves initializing a group of computational cells at high pressure with the correct blast energy to represent the charge volume. In this paper, a programme of numerical simulations of charge detonations in free-field air using the bursting sphere approach will be performed. This is done to investigate the errors in important blast parameters like peak overpressure and impulse that arise due to deviation of the charge shape from an ideal spherical profile when the charge is represented by a Cartesian mesh. This study will also include an assessment of the quality of error estimation for this problem based on grid refinement studies