Journal article
Unified Approach for Meso-Informed Burn Models in Shocked Energetic Materials
Journal of propulsion and power, Vol.36(5), pp.655-667
09/2020
DOI: 10.2514/1.B37810
Abstract
Reactive hydrocode calculations of shock-to-detonation transition in heterogeneous energetic (HE) materials need to be closed with burn models. One requirement of burn models is to supply a macroscale control volume with an energy release rate due to chemical reactions that reflects the subgrid physics of hotspot ignition and growth. Energy localization at hotspots delivers chemical energy at a rate e˙meso=ΔHr/τmeso, where ΔHr is the heat of reaction and τmeso is a meso-scale energy localization time scale. This energy deposition rate is much larger than nominal Arrhenius-form chemical energy deposition rates in a homogeneous sample subjected to the same shock loading. To develop meso-informed energy deposition rate models, this paper identifies a meso-scale energy release time scale τmeso that is common to burn models based on the hotspot ignition and growth concept. The identification of a common time scale allows for a unified microstructure-aware, physics-based reactive burn model; high-fidelity meso-scale numerical simulations are used to construct a surrogate model for τmeso. The surrogate model is shown to capture the effects of microstructural parameters on e˙meso and can be used for meso–macro coupling in a multiscale model to predict the sensitivity of HE materials.
Details
- Title: Subtitle
- Unified Approach for Meso-Informed Burn Models in Shocked Energetic Materials
- Creators
- H. S Udaykumar - The University of IowaOishik Sen - The University of IowaSangyup Lee - The University of IowaNirmal K Rai - The University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of propulsion and power, Vol.36(5), pp.655-667
- DOI
- 10.2514/1.B37810
- ISSN
- 0748-4658
- eISSN
- 1533-3876
- Publisher
- American Institute of Aeronautics and Astronautics
- Grant note
- FA8651-16-1-0005 / AFRL-RW
- Language
- English
- Date published
- 09/2020
- Academic Unit
- IIHR--Hydroscience and Engineering; Injury Prevention Research Center; Mechanical Engineering
- Record Identifier
- 9984121964302771
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