The Los Alamos National Laboratory multitasking library was used for the multitasking.
All of the physics routines are multitasked except the boundary conditions. All of the physics routines are vectorized except the thermodynamics and the interface tracer.
CTH was carefully designed to both vectorize and multitask on the Cray X-MP/416.
ISALE TILLOTSON EOS SOFTWARE
Multitasking the three-dimensional shock wave code CTH on the Cray X-MP/416ĬTH is a software system under development at Sandia National Laboratories Albuquerque that models multidimensional, multi-material, large-deformation, strong shock wave physics. Additionally, the code is uniquely suited to modeling blunt impact and blast loading leading to human body injury.« less As a modeled projectile impacts and penetrates a target, progressivelymore » smaller blocks of cells are placed around the projectile, which show in detail deformations and breakups. The software breaks penetration simulations into millions of grid-like “cellsâ€.
ISALE TILLOTSON EOS FULL
A full explanation can be seen in Appendix A.
ISALE TILLOTSON EOS SERIES
The code is an acronym for a complex series of names relating to its origin. CTH includes models for material strength, fracture, porosity, and high explosive detonation and initiation. The code solves complex multi-dimensional problems characterized by large deformations and strong shocks that are composed of various material configurations. Return on Investment (ROI) Framework Case Study: CTH.ĬTH is a Eulerian code developed at Sandia National Laboratories capable of modeling the hydrodynamic response of explosives, liquids, gases, and solids. In terms of computer resources, the run times are problem dependent, and are discussed in the text.« less In the 3-D problem, both codes reasonably replicated the penetration of the rod through the first plate.more » After this, however, the predictions of both codes began to diverge from the results seen in the experiment. Neither code correctly reproduced the depth of penetration in both experiments. Both codes did a reasonable job in modeling the outcome of the axisymmetric rod impact problem. Both SPHINX and CTH modeled the one-dimensional shock tube problem well. The results were then compared to experimental data. The CTH Eulerian hydrocode, and the SPHINX smooth particle hydrodynamics (SPH) code were used to model a shock tube, two long rod penetrations into semi-infinite steel targets, and a long rod penetration into a spaced plate array. We finally observe shock-melting of albite within a few iron and troilite grain models, and investigate the effects of higher porosity within the olivine matrix in the single iron and troilite grain models.Benchmarking the SPHINX and CTH shock physics codes for three problems in ballistics We concluded that specific dispositions of iron and troilite grains in mixtures allow for melting of iron and explain why it is possible to find a wide textural variety of melted and unmelted metal and iron sulfide grains in shock-darkened ordinary chondrites. We also characterized troilite melting in the 32–60 GPa nominal pressure range. Further effects are discussed such as the frictional heating between iron and troilite and the heat diffusion in scenarios with strongly heated troilite. Iron melting only occurred in models presenting either strong shock wave concentration effects or effects of heating by pore crushing, for which we provided more details. Only few of the models showed partial melting of iron (a phase difficult to melt in shock heating) due to the eutectic properties of the mixtures.
We observed, at a nominal pressure of 45 GPa, partial melting of troilite in all models. We introduced FeS-FeNi eutectic properties and partial melting in a series of chosen configurations of iron and troilite grains mixtures in a sample plate. We used the shock physics code iSALE at the mesoscale to simulate shock compression of modeled ordinary chondrites (using olivine, iron and troilite). We studied shock-darkening in ordinary chondrites by observing the propagation of shock waves and melting through mixtures of silicates, metals and iron sulfides.
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