Radiative Transport Model for Large-Eddy Fire Simulations.
Radiative Transport Model for Large-Eddy Fire
Baum, H. R.; Mell, W. E.
Chemical and Physical Processes in Combustion. Fall
Technical Meeting, 1996. Proceedings. Eastern States
Section/Combustion Institute. December 9-11, 1996,
Hilton Head, SC, 179-182 pp, 1998.
Combustion Theory and Modelling, Vol. 2, 405-422, 1998.
simulation; fire plumes; thermal radiation; predictive
models; transport equation
Three-dimensional simulations of fires can not be
performedon present day workstations without devision
simplifications to the governing equations. One such
method is the large eddy simulation (LES) approach for
fires developed at NIST. This method results in
computationally efficient fire simulations in which the
resources of the computer are applied to resolving the
buoyancy generated motion of hot gases and smoke. The
P1 approximation to the radiation transport equation was
found to be consistent with the exact transport equation
within scenarios upon which the large eddy simulation
approach is based. For the case of an isolated plume
and a constant absorption solving the P1 approximation
with a fast Fourier based method required only a
fraction of the total LES computational cost. Radiative
fluxes and intensities from the numerical and exact
solutions to the P1 approximation were in excellent