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The Center for the Simulation of Accidental Fires and Explosions CSAFE The University of Utah

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The Center for the Simulation of Accidental Fires and Explosions (C-SAFE) ... by actual experiments at the ATK Thiokol test facility, the explosion from ... – PowerPoint PPT presentation

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Title: The Center for the Simulation of Accidental Fires and Explosions CSAFE The University of Utah


1
The Center for the Simulation of Accidental Fires
and Explosions (C-SAFE)The University of Utah
2
Radiative and Convective Heat Flux Validation
  • Validation of the total radiant and convective
    heat flux at the surface of a 0.3 m diameter
    heptane pool fire. Simulations performed using
    the C-SAFE Uintah code at two different spatial
    resolutions are in good agreement with
    experimental data.

3
Comparison of Simulated vs
Measured Gas Velocities
  • Time-averaged vertical gas velocities for a 1m
    diameter methane fire are compared to
    experimental measurements performed at Sandia
    National Laboratory using two different Uintah
    fire codes. Agreement is even better for the
    compressible CFD code (ICE) than for the
    incompressible CFD formulation (Arches).

4
Gas Flare Simulation
  • Industrial flares are used to vent and burn waste
    gases from oil and gas drilling and refining
    operations. These simulations are some of the
    first in the world to show the time-dependent
    characteristics of such flows and to accurately
    model the changes that occur in the flow as a
    result of wind conditions. The gas flare burner
    industry has now recognized that
    Reynolds-averaged numerical simulation (RANS)
    approaches are not satisfactory for predicting
    the properties of flare operations (e.g., soot
    generation), and that full Large Eddy Simulations
    (LES) such as the C-SAFE Uintah code can provide
    are required.

5
Container Explosions
Solid Explosive
These simulations of an exploding container were
performed in order to demonstrate the difference
in explosion when a hollow bore region is left in
the center of the explosive, as compared to a
container enclosing a solid explosive. As
validated by actual experiments at the ATK
Thiokol test facility, the explosion from the
container enclosing the explosive with the hollow
bore is much more violent.
6
Helium Plume
  • Our simulations have shown the presence of
    Rayleigh-Taylor instabilities and the large
    vortical structures they generate, an observation
    also made in helium plume experiments conducted
    at the Sandia-Albuquerque FLAME facility. These
    instabilities, also called bubbles and spikes,
    result when a heave layer (air) sits over a light
    layer (helium) and lead to strong mixing. We
    have used the results of these simulations to
    better understand how vorticity is generated and
    to validate the accuracy of our CFD code.

Density
Vorticity
7
End to End Simulation
  • C-SAFE has a comprehensive verification and
    validation plan in place to validate its end to
    end fire/container simulation.
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