Empirical correlations between the function of entropy (ZS) and net artificial viscous work in a shock physics hydrocode

Kittell, David E.

doi:10.1063/12.0028745

Empirical correlations between the function of entropy (Z_S) and net artificial viscous work in a shock physics hydrocode

Journal Article · Mon Dec 09 00:00:00 EST 2024 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/12.0028745· OSTI ID:2481185

Kittell, David E. ^[1]

Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Entropy is a state variable that may be obtained from any thermodynamically complete equation of state (EOS). However, hydrocode calculations that output the entropy often contain numerical errors; this is not because of the EOS, but rather the solution techniques that are used in hydrocodes (especially Eulerian) such as convection, remapping, and artificial viscosity. Here, in this work, empirical correlations are investigated to reduce the errors in entropy without altering the solution techniques for the conservation of mass, momentum, and energy. Specifically, these correlations are developed for the function of entropy Z_S, and they depend upon the net artificial viscous work, as determined via Sandia National Laboratories’ shock physics hydrocode CTH. These results are a continuation of a prior effort to implement the entropy-based CREST reactive burn model in CTH, and they are presented here to stimulate further interest from the shock physics community. Future work is planned to study higher-dimensional shock waves, shock wave interactions, and possible ties between the empirical correlations and a physical law.

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOD; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 2481185

Report Number(s):: SAND--2024-16693J

Journal Information:: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 500008 Vol. 3066; ISSN 0094-243X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Empirical correlations between the function of entropy (ZS) and net artificial viscous work in a shock physics hydrocode

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