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Practical Scheme for Calculating the Fire-Induced Winds in the October 20, 1991 Oakland Hills Fire.


pdf icon Practical Scheme for Calculating the Fire-Induced Winds in the October 20, 1991 Oakland Hills Fire. (508 K)
Trelles, J. J.; Pagni, P. J.

U.S./Japan Government Cooperative Program on Natural Resources (UJNR). Fire Research and Safety. 12th Joint Panel Meeting. October 27-November 2, 1992, Tsukuba, Japan, Building Research Inst., Ibaraki, Japan Fire Research Inst., Tokyo, Japan, 297-305 pp, 1992.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Keywords:

fire safety; fire research; wind effects; wind direction; wind velocity; equations; expansion; vorticity

Abstract:

This research is based on the model developed by Howard Baum and Bernard McCaffrey. As a first step, a consistent set of characteristic scales are chosen to nondimensionalize all physical parameters and variables. The greatest advantage obtained by the following choice of nondimensionalization is that, once one has solved for the flow field induced by a single fire, the field produced by a series of fires is given by physically scaling each fire and then vectorially adding all the influences at a point. The nominal heat release, the ambient density, the ambient temperature, the specific heat, and the acceleration of gravity, are used to determine characteristic quantities, which are subscripted with a "c". The expressions for the characteristic length, velocity, vorticity, potential, and Stokes stream function, are given in Eq. (1). All the subsequent nondimensional quantities - superscripted with an asterisk - are obtained by dividing the dimensional quantity by the characteristic quantity.