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Arrhenius-Shock-Temperature State Sensitive WSD (AWSD) model implementation in CTH

ORAL

Abstract

The Arrhenius-Shock-Temperature State Sensitive WSD (AWSD) reactive flow model, developed by Aslam et. Al. [1] has been implemented into the CTH [2] hydrocode at Sandia National Laboratories. The AWSD model notably incorporates terms for desensitization, and temperature/density effects which are not captured in simpler models such as the History Variable Reactive Burn (HVRB). The Davis product and reactant equation of state [3] is used with the model. The model also utilizes the multi-state framework in CTH which allows the product and reactant equilibrium assumption to be either density/temperature or pressure/temperature. Pressure/temperature is used for this study to match published work. The model is verified using published parameters for PBX9502 [1]. The AWSD model will be compared to the CREST model which was also recently implemented into CTH [4]. Unlike CREST, the AWSD model does not have an entropy dependent reaction rate.

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Publication: [1] Aslam, Tariq Dennis, "A Recipe for implementing the Arrhenius-Shock-Temperature State Sensitive WSD (AWSD) model, with parameters for PBX 9502," (2017), https://doi.org/10.2172/1396160<br>[2] McGlaun, J. M., Thompson, S. L., and Elrick, M. G, "CTH: A three-dimensional shock wave physics code," (1986), https://doi.org/10.1016/0734-743X(90)90071-3<br>[3] Wescott, Stewart, Davis, "Equation of state and reaction rate for condensed-phase explosives," J. Appl. Phys., 98, 2005<br>[4] Kittell, D., Schmitt R., Tuttle L., and Harstad, E., "Implementation of a CREST multistate reactive burn model in CTH for two solid high explosives," in Proceedings of the Sixteenth Detonation Symposium, (2018) pp. 1021–31.

Presenters

  • Kevin Ruggirello

    Sandia National Laboratories

Authors

  • Kevin Ruggirello

    Sandia National Laboratories