Numerical reconstruction of part of an actual blast-wave flow field to agree with available experimental data
Abstract
A method of solution is presented and validated for the numerical reconstruction of a certain part of an actual blast-wave flow field of interest for planar, cylindrical and spherical explosions, away from the explosion source where the blast-wave has become sufficiently weak that real-gas effects are unimportant. This method involves, essentially, a trial-and-error process of constructing the best possible path of a fluid particle or equivalent piston at the upstream side of the flow field of interest such that the resulting flow field constructed numerically in front of the equivalent moving piston agrees as well as possible with all available although limited experimental data. The relatively new random-choice method was suitably modified to easily handle the numerical computations of the nonstationary flow in front of the moving piston. Finally, the present method is used to reconstruct the flow field for past TNT and ANFO explosions, for which the blast-wave amplitudes are less than about 1 MPa. These results are presented in convenient graphical and tabular form, scaled for the case of a 1-kg TNT surface explosion or its equivalent in a standard atmosphere, so that they can be utilized readily for different sized explosions at the same or other atmospheric conditions.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- November 1983
- Bibcode:
- 1983STIN...8516061L
- Keywords:
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- Explosions;
- Flow Distribution;
- Mathematical Models;
- Shock Waves;
- Compression Waves;
- Computer Programs;
- Flow Velocity;
- Overpressure;
- Trinitrotoluene;
- Fluid Mechanics and Heat Transfer