ALEGRA : version 4.6.

Determining whether an equation of state (EOS) table is valid for a given regime requires several steps that include confirming that it obeys the thermodynamic consistency relations and that the table matches available existing experimental data. Once the EOS is analyzed, then we must ensure the simulation code can reproduce analytical results.In this report, we show analytical results of Hugoniot calculations and compare them with values calculated from experimental U s − U P data. Next we check that the tables are thermodynamically consistent. Then, we show analytical results of impedance matching using one of the aluminum EOS models and compare those analytical results to data. Finally, ALEGRA-HEDP is used to run a pseudo 1-D shock simulation, which is compared to the analytical model with an error of approximately 0.1%. This implies that ALEGRA-HEDP can simulate the shock Hugoniot to within the error of the EOS table when compared to the experimental data for an ideal simulation. 3 AcknowledgmentWe would like to thank Tim Trucano for his many helpful comments and insight, Chris Garasi for his direction, and Tom Mehlhorn for the opportunity to pursue interesting topics. 4

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ALEGRA-HEDP : version 4.6.

Garasi¹,

Cochrane²,

Mehlhorn³

et al. 2005

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ALEGRA is an arbitrary Lagrangian-Eulerian finite element code that emphasizes large distortion and shock propagation in inviscid fluids and solids. This document describes user options for modeling resistive magnetohydrodynamics, thermal conduction, and radiation transport effects, and two material temperature physics. 3 AcknowledgmentThe authors wish to acknowledge the assistance of Bob Campbell, Dan Carroll, Mary Chen, Mike Desjarlais, Jeff Lawrence, Ray Lemke, Bryan Oliver, Steve Rosenthal, Erik Wemlinger, and especially Tim ("The Enchanter") Trucano in inspecting and testing the HEDP physics options for the ALEGRA code and its predecessors (primarily SPARTAN, RHALE++, and RHALE).Pavel Bochev has made important contributions to the description and understanding of the edge element discretization for the 3D magnetics. Jonathan Hu and Ray Tuminaro have been instrumental in the development and implementation of the algebraic multigrid software.We would also like to acknowledge the support of the members of the NEVADA framework development team and the rest of the ALEGRA development team. Their perpetual assistance in areas of team leadership, architecture, configuration management, regression testing, Diatom insertion, remap and advection, and more, have been invaluable.

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ALEGRA : version 4.6.

Cited by 5 publications

References 17 publications

EMPHASIS/Nevada UTDEM user guide. Version 2.0.

EMPHASIS/Nevada UTDEM user guide. Version 2.0.

Aluminum equation of state validation and verification for the ALEGRA HEDP simulation code.

ALEGRA-HEDP : version 4.6.

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