A Parameter Study of Fast Cookoff

Purpose1. Examine the effect of five parameters on the incident

heat flux to an energetic deviceA. Fire SizeB. Container Location (height and radial location)C. Wind SpeedD. Fuel Evaporation Rate

2. Examine the effect of the resulting heat fluxes on the ultimate behavior of the container

A. Time to IgnitionB. Time to Container RuptureC. Violence of Explosion

3. Examine the ability of Uintah to make predictive calculations for our target scenario

General Scenario

Pool Diameter: 0.5 m - 1.0 m

Container Height: 0.25 m - 1.0 m

Container Offset: 0.0 - 1.0 m

Wind Speed: 0.0 - 4.0 m/s

Fuel Evaporation: 1.6 - 6.4 (mm/min)

Strategy - Part 1

MPMArches simulations of fire withcontainer compute radiative heat fluxat discrete locations on container surface

Polar curve fit to discrete heat fluxat several points along the axis

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Strategy - Part 2

Implicit MPM code computes heat conduction using heat flux values interpolated from the curve fits.

Upon reaching ignition criteria, code switches automatically to explicit AMR MPM-ICE calculation

Fire Movie

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Explosion Movie

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Validation?

Heat Flux vs. Time to Ignition

Steel Case Kinetic Energy

Kinetic Energy/PBX Mass Burned