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Gaseous detonation dynamics

Gaseous detonation dynamics. Multiscale and multiphysics problem Some important critical issues Role of turbulence in chemical reaction Prediction of critical parameters Initiation energy Critical diffraction diameter Minimum tube diameter Key computational problems

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Gaseous detonation dynamics

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  1. Gaseous detonation dynamics • Multiscale and multiphysics problem • Some important critical issues • Role of turbulence in chemical reaction • Prediction of critical parameters • Initiation energy • Critical diffraction diameter • Minimum tube diameter • Key computational problems • Known but very large reaction mechanisms • Turbulent flow in portions of reaction zone ASCI-ASAP Research Review October 23-24, 2002

  2. Goals Simulate the detonation process in three dimensions, with viscous effects, and a realistic reaction model that represents a fuel-oxidizer system of moderate complexity • Issues • Role of turbulence in reaction zone • origin of detonation substructure • regular vs. irregular cellular structure • Role of instability in: • Initiation • Diffraction • Interaction with structures ASCI-ASAP Research Review October 23-24, 2002

  3. The length scale challenge 7.4 mm l/L = 74,000 77 mm 500 nm Stoichiometric hydrogen-oxygen mixture at an initial pressure of 20 kPa ASCI-ASAP Research Review October 23-24, 2002

  4. Proposed Approach • Detonation modeling in gases • Development of realistic reduced reaction models for 2D and 3D simulations – follow on to current ILDM work • High resolution simulations resolving instability (transverse) wave • Analyse canonical problems such as diffraction to develop physical insight and theories for critical parameters • Development approximate methods to handle mixing and Buil in turbulent regions behind front • Build on ongoing work in compressible turbulence • Viscous flow solvers for compressible flow • Adaptive Mesh Refinement Mesh (AMR) methods • Relationship to VTF • Detonation simulation essential component ASCI-ASAP Research Review October 23-24, 2002

  5. Detonation Wave Diffraction • Detonation can fail, i.e., shock wave and reaction zone decouple during diffraction ASCI-ASAP Research Review October 23-24, 2002

  6. Detonation Initiation by Projectiles ASCI-ASAP Research Review October 23-24, 2002

  7. 0.56 mm Surface Notch Wall Detonation propagation 41 mm VTF Application: Detonation-driven fracture Detonation wave direction ASCI-ASAP Research Review October 23-24, 2002

  8. Validation... ASCI-ASAP Research Review October 23-24, 2002

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