INNER WALL FIRE SPREAD

[DUMBMY-HEAD]

Hello, I'm undergraduate student who Trying to make simulation of KS F 8414 fire test(Modified BS8414). The paper I have refered to construct wall with Drybit structure. So first I tried to make model without any pyrolysis, I set SURF with 3 layers Basecoat-Insulation material-Concrete.

It turned out outer wall temperatures fit quite well with experiment while Insulation center temperature was too low. I assumed the cause of an error was not accounting for any coating failure. But after some research, I found a BRE report(241812-1) that is very similar to my simulation and saw wall coating in quite goon shape. So now I think the reason for the mismatch is a neglect of Insulation burning (at least melting).

Now problem is how to model phase changes behind incombustible coating. I have ran small test and figured out Insulation material behind Basecoat doesn't acting at all. I have read an example in FDS user guide about The couch fire, which is all layers are combustible. Is there any methods for this kind of jobs? Maybe HT3D?

Thank you

[Vojta-Salek]

Hello, you can do a simple test. There should be no problem to decompose layers beneath incombustible coating. Once you specify their pyrolysis parameters, the released gases will be transported to the surface according to LAYER_DIVIDE value. Transport from inner layers to the surface is immediate and it should not take care about incombustible layers standing in the way.

[DUMBMY-HEAD]

Thank you for your replay, I will have a try.