Event Title

Computation of the TACOT Intercalibration Testcase for the 4th AFOSR/SNL/NASA Ablation Workshop using FABL

Start Date

1-3-2011 8:00 AM

End Date

3-3-2011 12:30 PM

Description

The TACOT testcase will be computed using FGE's ablation code FABL. Results will be presented for the purposes of inter-model comparison and calibration. FABL is a 'standard' effective properties code with the following modules:

  1. Basic numerical method : STAB2 (1D implicit shrinking grid with multi-materials , contact resistances etc)
  2. Multiple Arrhenius decomposition from TGA, with arbitrary grouping (resin/fibres/contaminants)
  3. Equilibrium or non-equilibrium pyrolysis gas treatment
  4. Internal pressures from Darcy type law
  5. Iterative TPS sizing for input design rules.
  6. Adjoint scheme and simple optimiser for fitting of effective properties to arc heater or flight measurements (or sets of)
  7. Simple surface chemistry modules for surface energy balance:
    1. Carbon ablation (kinetic, diffusion limit, sublimation)
    2. Teflon model
    3. Melt failure (silica etc)
    4. Variable surface stoichiometry materials + failure
    5. Surface roughness evolution model based on differential ablation rates, shape factor and Dirling correlation. (used when coupling to flow codes)
  8. Flame front model with equilibrium/frozen burn treatment for pyrolysis gases for charring ablators. The burn efficiency is an empirical factor.

Boundary conditions can be defined in terms of temperature or heat flux.

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Mar 1st, 8:00 AM Mar 3rd, 12:30 PM

Computation of the TACOT Intercalibration Testcase for the 4th AFOSR/SNL/NASA Ablation Workshop using FABL

The TACOT testcase will be computed using FGE's ablation code FABL. Results will be presented for the purposes of inter-model comparison and calibration. FABL is a 'standard' effective properties code with the following modules:

  1. Basic numerical method : STAB2 (1D implicit shrinking grid with multi-materials , contact resistances etc)
  2. Multiple Arrhenius decomposition from TGA, with arbitrary grouping (resin/fibres/contaminants)
  3. Equilibrium or non-equilibrium pyrolysis gas treatment
  4. Internal pressures from Darcy type law
  5. Iterative TPS sizing for input design rules.
  6. Adjoint scheme and simple optimiser for fitting of effective properties to arc heater or flight measurements (or sets of)
  7. Simple surface chemistry modules for surface energy balance:
    1. Carbon ablation (kinetic, diffusion limit, sublimation)
    2. Teflon model
    3. Melt failure (silica etc)
    4. Variable surface stoichiometry materials + failure
    5. Surface roughness evolution model based on differential ablation rates, shape factor and Dirling correlation. (used when coupling to flow codes)
  8. Flame front model with equilibrium/frozen burn treatment for pyrolysis gases for charring ablators. The burn efficiency is an empirical factor.

Boundary conditions can be defined in terms of temperature or heat flux.