NIST Time|NIST Home|About NIST|Contact NIST

HomeAll Years:AuthorKeywordTitle2005-2010:AuthorKeywordTitle

Radiative Transport Model for Large-Eddy Fire Simulations.


pdf icon Radiative Transport Model for Large-Eddy Fire Simulations. (1212 K)
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.

Keywords:

simulation; fire plumes; thermal radiation; predictive models; transport equation

Abstract:

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 agreement.