fire modeling strategy - fireseat.eng.ed.ac.uk · fire modeling program ! initiated in 2008 !...
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Fire modeling strategy
Louis Gritzo, Ph.D. Vice President, Research
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40 Years Ago
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Fire Technology Lab
Hydraulics Lab
Electrical Lab
Natural Hazards Lab
Explosion Test Site
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Fire Protection Today
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Drivers
§ Perform Better Tests – Quality – Scope
§ Provide Deeper Knowledge
§ Engage and Advance the Community
§ Provide Better Protection
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Fire modeling program § Initiated in 2008 § Investment in staff and scientific computing* § Five-year objective
– modeling capabilities to reduce the number of large scale tests required for sprinkler protection of storage applications
§ Strategic goal – Predictive fire modeling capabilities for some
applications * 1280 cores cluster, 10 Teraflops
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Modeling scope
§ Challenges – Multi-physics – Multi-scale
The Basics § Growth § Protection
Turbulent Flame
Heat transfer
Sprinkler spray
Fuel pyrolysis
Wet fuels
Water transport
Fire suppression
Buoyant flow
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Computing Performance
Source: H. W. Meuer & H. Gietl, Supercomputers – Prestige Objects or Crucial Tools for Science and Industry?
FM Global clusters
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Key Factors
§ Complexity § Scale § Rigor
Turbulent Flame
Heat transfer
Sprinkler spray
Fuel pyrolysis
Wet fuels
Water transport
Fire suppression
Buoyant flow
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Efficient approach
§ OpenFOAM toolbox – Imperial College – Supported by OpenCFD
§ Develop only key models: FireFOAM § Open source
– Acceptance – Cooperation with academia and industry
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Annual Workshops
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Modeling technique
§ Equations solved on grids in multiple time steps
§ Solid, liquid, gas phase grids and spray droplets
§ Calculations – Days to run – Multiple possible
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Program milestones
FireFOAM 2008
8’ Parallel Panel Test 2009
2x4x3 rack Free burn 2010
2x4x3 rack Water application 2011 Rack storage
sprinkler suppression 2012
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Fire growth
2x2x3; 2x4x3 Racks
8’ Parallel Panel Test
Fuel properties from bench-scale
Material decomposition model
Validation
FPA apparatus
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Fire growth: PPT
§ Captured fire size and propagation behavior
Test Model
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Fire growth: rack storage
Model Tests
2x2x3
2x4x3
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Fire growth validation
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Fire growth: predictability
§ Small to large scale
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Water based suppression
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Sprinkler spray modeling
§ Characterize selected sprinklers – Water flux – Droplet sizes – Number density
§ Spray model track droplets
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Spray transport validation: ADD
§ 2 MW fire, ELO K11.2, 11psi
Experiment Measurement
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Water transport modeling § Thin-film model
– Partial wetting – Heat transfer
§ Coupled with gas phase and solid fuel models
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Experiments & Validations
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Water transport validation
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Coupling fire growth & suppression – Couple three phases through boundary
conditions
Solid Liquid Gas • Meredith, Wang, et. al. 2013, ISFEH
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Sprinkler tests and simulations
Model Test
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Cooperation
§ Universities – Edinburgh, Ghent,
Kingston, Maryland, WPI,USTC…
§ Industry / Government – EdF, IRSN, NIST, Oak
Ridge, OpenCFD, Sandia, UTRC,…
§ FM Global Fire Modeling Workshops
1st workshop 2009
4th workshop 2012
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Fire modeling future
§ Apply current model and continue FireFOAM development – Next 5-year roadmap
Enhance current model
New model development
Application
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Engineering Impact
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0
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Time [s]
Measurement, No Pallet
Measurement, Wood Pallet
FireFOAM, No Pallet
FireFOAM, Wood Pallet
Effect of Wood Pallets
!
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Higher Storage
0
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0 50 100 150 200 250 300 350
Che
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[MW
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Time [s]
Measurement, 3-tier
Measurement, 5-tier
FireFOAM, 3-tier
FireFOAM, 5-tier
FireFOAM, 7-tier
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In-Rack Protection, UEP
Simulation Test
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In-Rack Protection, UEP Protection Data Compared to Water Transport Calculations
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Benefits
§ Reduced number of large scale tests for specific problem
§ Better, more reliable, protection guidelines § Faster turnaround of support projects § Research Value
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Fire modeling future
§ Modeling will never replace testing – Complement test data – Design better tests
Small and medium scale tests
Large scale validation
Modeling
Protection concept
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Questions?