Extended grassland calculation results with comparisons to priscilla experimental data and a near-ideal calculation. Final report, October 1993-March 1995
An extended calculation of the nonideal airblast environment resulting from a PRISCILLA-like nuclear detonation has been completed. This calculation used the results of the S-CUBED THRML code to determine the structure of the preshock turbulence, surface roughness, and material lofted during the burning process in determining the near surface blast environment. No dust sweep up was used. The argument is that the roots of the grass will remain intact and prevent the erosion and entrainment of large amounts of dust. Full hydrodynamic definition of the precursor environment is now available from ground zero to a distance of nearly 2 km. Information includes full spatial definition at about 25 selected times and full time resolved waveforms at over 1,000 locations. The results of the calculation are compared to experimental data from the PRISCILLA shot and show the influence of the more intense thermal layer created by the burning grassland. An accompanying calculation without a thermal layer was also extended over a 2-km range. This calculation served as the ideal case. The ideal calculation included the effects of surface roughness and turbulence but not an interaction with a thermal layer or dust sweep up. Results of this calculation are used to quantify the differences specifically caused by thermal interactions. The enhancement and extent of the precursor effects of this calculation relative to the experiment demonstrate that precursors over desert surfaces do not result in the worst-case environments for detonations over real surfaces. The definition and understanding of the free-field environment is the necessary first step to predicting loads and response of vehicles or other targets subjected to such an environment.
- Research Organization:
- S-Cubed, Albuquerque, NM (United States)
- OSTI ID:
- 198670
- Report Number(s):
- AD-A-298081/1/XAB; CNN: Contract DAAL01-94-P-2257; TRN: 60240029
- Resource Relation:
- Other Information: DN: Original contains color plates: All DTIC/NTIS reproductions will be in black and white; PBD: Jul 1995
- Country of Publication:
- United States
- Language:
- English
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