Simulation of Fires With Radiative Heat Transfer.
Simulation of Fires With Radiative Heat Transfer.
(85 K)
Mell, W. E.; Baum, H. R.; McGrattan, K. B.
Fire Research and Engineering, Second (2nd)
International Conference. (ICFRE2). Proceedings.
ABSTRACTS ONLY. National Institute of Standards and
Technology and Society of Fire Protection Engineers.
August 10-15, 1997, Gaithersburg, MD, Slaughter, K. C.,
Editor(s), 13-13 pp, 1997.
Keywords:
fire research; fire protection engineering; radiative
heat transfer; simulation; thermal radiation
Abstract:
ABSTRACT ONLY
In large fires a substantial fraction of the chemically
generated heat is transferred by thermal radiation. For
fires in an enclosure, radiative heat transfer is
particularly important in terms of fire spread. The
dynamics of highly sooting fires in unbounded domains
may also be strongly influenced by thermal radiation.
Radiative heat transfer models which include the effects
of absorption by soot and gaseous products are therefore
an important component of fire simulations. Most field
model based simulations of fires use computationally
expensive thermal radiation models. This simulations
which include thermal radiation often do so at the cost
of reduced spatial resolution. The objective of this
work is to include thermal radiation in simulations of
fires in both enclosures and open domains while
maintaining a high resolution of convective transport.
This is possible by modeling radiative transport in a
way which retains the important effects relevant to the
scenario of interest. for example, in a large fire
within an enclosure, extended regions containing large
amounts of soot and/or products may form. A radiation
model which accounts for variable absorbtion is
appropriate in this case. Thus, for enclosures, thermal
radiation will be modeled by the P1 approximation
equation which will be solved using a multigrid
algorithm.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899