ALE3D Simulations of Gap Closure and Surface Ignition for Cookoff Modeling

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We are developing ALE3D models to describe the thermal, chemical and mechanical behavior during the heating, ignition and explosive phases of various cookoff phenomena. The candidate models and numerical strategies are being evaluated using benchmark cookoff experiments. ALE3D is a three-dimensional computer code capable of solving the model equations in a coupled fashion through all the phases of the cookoff in a single calculation. For the cookoff experiments, we are interested in representing behavior on widely varying timescales. We have used an implicit hydrodynamics option during the heating phase and an explicit solution method during the explosive phase. To complicate ... continued below

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Howard, W M; McClelland, M A & Nichols, A L June 22, 2006.

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We are developing ALE3D models to describe the thermal, chemical and mechanical behavior during the heating, ignition and explosive phases of various cookoff phenomena. The candidate models and numerical strategies are being evaluated using benchmark cookoff experiments. ALE3D is a three-dimensional computer code capable of solving the model equations in a coupled fashion through all the phases of the cookoff in a single calculation. For the cookoff experiments, we are interested in representing behavior on widely varying timescales. We have used an implicit hydrodynamics option during the heating phase and an explicit solution method during the explosive phase. To complicate the modeling problem, high heat fluxes cause rapid temperature increases in boundary layers and lead to the formation of gaps between energetic and structural materials and ignition on surfaces. The initially solid energetic and structural materials react to produce gases, which fill the gaps. These materials can also melt and flow. Since an implicit solution method is used, simple no-strength materials models can no longer be used for liquids and gases. In this paper, we discuss and demonstrate choices of materials models for solid/liquid/gas mixtures to be used in conjunction with the implicit solution method. In addition, results are given for mesh movement strategies applied to the opening, closing, and surface ignition within gaps.

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PDF-file: 12 pages; size: 1.1 Mbytes

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  • Presented at: 13th International Detonation Symposium, Norfolk, VA, United States, Jul 23 - Jul 28, 2006

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  • Report No.: UCRL-CONF-222367
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 929179
  • Archival Resource Key: ark:/67531/metadc898320

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  • June 22, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 2, 2016, 7:14 p.m.

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Howard, W M; McClelland, M A & Nichols, A L. ALE3D Simulations of Gap Closure and Surface Ignition for Cookoff Modeling, article, June 22, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898320/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.