Fitting the HRR curve
shiyi....@gmail.com
o...@aquacoustics.biz
As an aside, if this is foam furniture then the peak HRR appears to be way too low. A useful rule of thumb is 1 MW per seat. See the EC-CBUF Study.
shiyi....@gmail.com
Thank you very much! I'm following your guide to do literature review. By the way, do you know how to make it possible in the model for two different materials to have the possibility of being spread by the flame. (e.g. flames spreading from a sofa to a wooden floor)
Tim O'Brien
Yes, I know how to do flame spread in FDS. There is more than one way. But you will learn more by reading the FDS Users Guide (don’t just scan it - study it) and by experimenting with the many examples that come bundled with the softwar rather than my giving you a solution.
In essence you need to define obstruction surfaces that will ignite and burn at a specified rate, and incorporate an ignition source (something to get the fire started).
Have a look at Section 9 of the Guide (and perhaps 9.1.1). Have a look at the ‘fires’ example models. The couch model might be instructive. This is often one of the first models that new FDS users run. Ignore the bun-away feature. Find the ignition source. Study the material properties to understand why the couch burns and why the fire spreads.
I attach a model of a rack fire complete with sprinkler protection. The model is very simple but incorporates complex fire and suppressions phenomena. Run it (it may need some syntax adjustments as FDS is forever changing). Then study it to find the ignition source and understand how the fire spreads between the cartons in the rack arrays.
T.G. O'Brien, PG Cert. Eng. (Fire), BE(Hons.), MSFPE, CMEngNZ, Int. PE
Principal Consulting Fire Engineer
Managing Director
FireNZE (a trading division of Aquacoustics Limited)
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shiyi....@gmail.com
David Sheppard
