CFAST Output Comparison Method and Its Use in Comparing Different CFAST Versions.
CFAST Output Comparison Method and Its Use in Comparing
Different CFAST Versions.
Alvord, D. M.
NISTIR 5705; 51 p. August 1995.
Available from: National Technical Information Service
Order number: PB96-109541
computer models; computer programs; comparison;
differences; fire models; fire research; predictive
A multiple step method was developed to compare the
output of CFAST simulations, produced either by the same
version of CFAST, or by different versions of the model.
Scenarios to be compared are run with CFAST before the
method is used, producing files containing a history of
the model results. The first step of the comparison
method produces a text file of important output
variables from each of these history files,
corresponding to significant fire phenomena occurring
during the course of each fire simulation. The next
step of the method is used to compare two such text
files, and store their differences. Finally, the last
step summarizes the difference information found in one
or more files from the previous step. The comparison
method can be used to find differences between CFAST
runs, and to track changes in the CFAST model and detect
if they perform as anticipated. It has been used to
compare three CFAST versions through use of a documented
set of test files. This set will change as improvements
are made to the model. The method can be used to find
the effects whenever any substantial changes are made to
CFAST, and is a useful tool for any user of the model.
This report describes the comparison method in
sufficient detail to serve as a user's guide, provides
examples of the method's use, and discusses ways in
which it could be improved and generalized.