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T.G. Theofanous Center for Risk Studies and Safety University of California, Santa Barbara

STEAM EXPLOSIONS. T.G. Theofanous Center for Risk Studies and Safety University of California, Santa Barbara. Risk Complexity An Approach Based on Key Physics (ROAAM). Propagation Key Physics. Multiphase Thermal Detonation: Microinteractions. FUEL. NON-PARTICPATING COOLANT.

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T.G. Theofanous Center for Risk Studies and Safety University of California, Santa Barbara

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  1. STEAM EXPLOSIONS T.G. Theofanous Center for Risk Studies and Safety University of California, Santa Barbara Risk Complexity An Approach Based on Key Physics (ROAAM)

  2. Propagation Key Physics Multiphase Thermal Detonation: Microinteractions FUEL NON-PARTICPATING COOLANT COOLANT VAPOR (melt) m-FLUID PREMIXTURE vO, PO

  3. ESPROSE.m Verification Physics Numerics • Space/Time Discretization • Numerical Diffusion • Artificial Viscosity Wave Dynamics Explosion Coupling Experimental Analytical • Characteristics Solutions for Coupled Explosion/Reflection at Free Surfaces • SIGMA • Constitutive Laws • for Microinteractions Integral Aspects Experimental • KROTOS Analytical Analytical Experimental • Exact Solutions for Steady Detonations (C-J) • Effect of Idealizations in Exact Solutions • 2D/3D Code Comparison • SIGMA • Single and • Two-Phase • - Multiple regions • Characteristics Solutions in 1D Geometries • Exact Solutions in 2D Geometries

  4. VERIFICATION OF ESPROSE.m CODE

  5. Both DNS and Effective-Field

  6. Ex-Vessel Explosion

  7. EX-VESSEL EXPLOSION

  8. ESPROSE.m Results in the P-v plane in Relation to Shock Adiabat and the Hugionot

  9. Premixing Key Physics • Penetrative Thermal Radiation • Multifield and Multidimensional • Large Scale Discontinuities • Evolving Melt Length Scales • Eulerian-Lagrangian. No numerical diffusion • Characteristics-Based Matching with MuSiC • Flexibility in “Laws” of Breakup used to Envelop Premixtures of Risk Significance

  10. PM-ALPHA Verification Physics Numerics • Space/Time Discretization • Numerical Diffusion Multifield Aspects Breakup Aspects Integral Aspects Experimental Analytical • Single Particle • MAGICO • QUEOS • Single Particle • Drift Flux Experimental Code Comparison • MIXA • FARO • CHYMES • PM-ALPHA.3D

  11. VERIFICATION OF PM.ALPHA.L CODE 3D Multi-field modeling (4 fields: water, steam, fuel, debris) Closure laws (flow regimes, boiling heat transfer regimes, momentum transfer, breakup)

  12. Representative frames from PM-ALPHA.L simulations of QUEOS runs Q6, Q8, and Q10

  13. Illustration of flow regimes and effect of subcooling as depicted by PM-ALPHA.L simulations of representative MAGICO runs All frames are at 0.3 s following initial contact with water.

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