Development of 3d pyrolysis in FDS

Morgan Bruns*, Randall McDermott, Salah Benkorichi, Simo Hostikka

*Corresponding author for this work

Research output: Contribution to conferencePaperScientificpeer-review


Computational predictions of flame spread could support the design and development of safer products and buildings. Flame spread is a multiscale, multiphase, and multidimensional problem. In particular, downward flame spread is largely driven by multidimensional heat conduction within the condensed phase. The Fire Dynamics Simulator (FDS) currently utilizes a 1D pyrolysis model. A 3D heat transfer solver has recently been implemented in FDS. The 3D solver is verified against an analytical solution for heat conduction in a sphere with internal heat generation and a constant surface temperature boundary condition. In the present work, the pyrolysis source term from the 1D solid model in FDS has been ported to the 3D heat transfer model to enable multidimensional pyrolysis simulations. As with the 1D solid model, pyrolysis gas is assumed to be instantaneously transported to the nearest upward facing surface. The 3D pyrolysis model is verified against predictions of PMMA gasification from the 1D solid model in FDS.

Original languageEnglish
Publication statusPublished - 1 Jan 2018
EventSpring Technical Meeting of the Eastern States Section of the Combustion Institute - State College, United States
Duration: 4 Mar 20187 Mar 2018


ConferenceSpring Technical Meeting of the Eastern States Section of the Combustion Institute
Abbreviated titleESSCI
CountryUnited States
CityState College


  • Burning Rate
  • FDS
  • Pyrolysis


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