Improvements to the AFWL HULL code. Final report, 21 August 1978-31 March 1979

Technical Report · Fri Jun 01 00:00:00 EDT 1979

OSTI ID:5877367

Chambers, III, B S; Hasdal, J A; Thomas, W R

Two problems were addressed during this effort: numerical diffusion, which exists in HULL, significantly affects the calculations of nuclear air bursts a low overpressure, and some HULL calculations being performed are of phenomena that have large regions of relatively little hydrodynamic activity in them and to efficiently perform these types of calculations, modifications to HULL were needed. Modifications were made to the HULL code in an attempt to reduce numerical diffusion at low overpressure by employing a version of Flux Corrected Transport (FCT). A version of FCT was provided by the AFWL and this was implemented in HULL and tested for a simulation of a spherically symmetric explosion. The modifications to HULL were made in the AFWL two-dimensional version. The low overpressure shocks were sharpened by the FCT approach for a given cell size. The improvement is not considered to be sufficient to justify the additional cost incurred as a result of the more complex numerical differencing in this particular version of FCT. In the second area, a technique was developed for avoiding computing within certain regions of the mesh, which was also implemented in the two-dimensional version, and additional quantitative criteria were established as the basis for subsequent development of better rezone techniques.

• Research Organization: Science Applications, Inc., McLean, VA (USA)
• OSTI ID: 5877367
• Report Number(s): AD-A-100108/0
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450200* -- Military Technology
Weaponry
& National Defense-- Nuclear Explosions & Explosives
AIRCRAFT
ALGORITHMS
BLAST EFFECTS
COMPUTER CODES
EXPLOSIONS
FLUID MECHANICS
HYDRODYNAMICS
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MECHANICS
NUCLEAR EXPLOSIONS
PROGRAMMING
SIMULATION