T.G. Theofanous Center for Risk Studies and Safety University of California, Santa Barbara
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Transcript of T.G. Theofanous Center for Risk Studies and Safety University of California, Santa Barbara
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T.G. Theofanous
Center for Risk Studies and Safety University of California, Santa Barbara
STEAM EXPLOSIONS
Risk Complexity
An Approach Based on Key Physics (ROAAM)
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m-FLUID PREMIXTURE
vO, PO
COOLANTVAPORFUEL
(melt)NON-PARTICPATING COOLANT
Multiphase Thermal Detonation: MicrointeractionsMultiphase Thermal Detonation: Microinteractions
Propagation Key Physics
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ESPROSE.m Verification
Physics Numerics
• Space/Time Discretization
• Numerical Diffusion
• Artificial Viscosity
Analytical
•Exact Solutions for Steady
Detonations (C-J)
•Effect of Idealizations in Exact Solutions
•2D/3D Code Comparison
Integral Aspects
Experimental
• KROTOSAnalytical
• Characteristics Solutions in 1D Geometries
• Exact Solutions in 2D Geometries
Wave Dynamics
• SIGMA
-Single and
Two-Phase
- Multiple regions
Explosion Coupling
Experimental
Analytical
• Characteristics Solutions for Coupled Explosion/Reflection at Free Surfaces
• SIGMA
Constitutive Laws
for Microinteractions
Experimental
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rR
H
z
Water Level
Explosion Zone
pSource of radius R
VERIFICATION OF ESPROSE.m CODE
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Both DNS and Effective-Field
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Ex-Vessel Explosion
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EX-VESSEL EXPLOSION
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ESPROSE.m Results in the P-v plane
in Relation to Shock Adiabat and the Hugionot
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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
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PM-ALPHA Verification
Physics Numerics
• Space/Time Discretization
• Numerical Diffusion
Code Comparison
• CHYMES
• PM-ALPHA.3D
Multifield Aspects
Integral Aspects
Experimental
• MIXA
• FARO
Breakup Aspects
Analytical
• Single Particle
• Drift Flux
Experimental
• Single Particle
• MAGICO
• QUEOS
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3D Multi-field modeling (4 fields: water, steam, fuel, debris)
Closure laws (flow regimes, boiling heat transfer regimes, momentum transfer, breakup)
VERIFICATION OF PM.ALPHA.L CODE
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Representative frames from PM-ALPHA.L simulations Representative frames from PM-ALPHA.L simulations of QUEOS runs Q6, Q8, and Q10of QUEOS runs Q6, Q8, and Q10
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Illustration of flow regimes and effect of subcooling as Illustration of flow regimes and effect of subcooling as depicted by PM-ALPHA.L simulations of representative depicted by PM-ALPHA.L simulations of representative
MAGICO runsMAGICO runs
All frames are at 0.3 s following initial contact with water.