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-   -   Nist Fire Dynamic Simulator (http://www.cfd-online.com/Forums/main/5223-nist-fire-dynamic-simulator.html)

Miren September 30, 2002 10:35

Nist Fire Dynamic Simulator
 
Hi, i'am a phd student using Nist Fire Dynamic Simulator and i'am not able to add a new material to the database in order to use it in my proyect. i need to have a wall whith a different 'surface' than the program offer me, i've tried to make a new database but when i try it to run it doesn't found the database o doesn't recognize the material. where could be the problem? thanks in advance

Miren

Steve October 1, 2002 09:46

Re: Nist Fire Dynamic Simulator
 
Have you add the location of the data base in the MIST line ?? To avoid a data base, which may not be the best solution when you want to modify your material at each run, I put the material directely in the main project as:

&MISC SURF_DEFAULT='BETON',REACTION='POLYSTYRENE',NFRAME S=1200,DTCORE=10.,TMPA=20.0,U0=0.21 /

&SURF ID = 'SHEET METAL'

ALPHA=5.20E-5

KS=55.0

DELTA=0.01

BACKING = 'INSULATED' /

&SURF ID='FIRE BRICK'

ALPHA=2.25E-7

KS=0.1

DELTA=0.01

BACKING = 'INSULATED' /

&SURF ID = 'BETON'

FYI = 'Quintiere, Fire Behavior'

ALPHA = 8.4E-7

KS = 1.5

DELTA = 0.2 /

&REAC ID='POLYSTYRENE'

FYI='Styrene, C_8 H_8'

MW_FUEL=104.

NU_O2=10.

NU_H2O=4.

NU_CO2=8.

SOOT_YIELD=0.164

CO_YIELD=0.06

RADIATIVE_FRACTION=0.45 /

&SURF ID='FIRE1'...........etc

Miren October 1, 2002 10:01

Re: Nist Fire Dynamic Simulator
 
Thank you very much, i've tried it and i've got good results.

I'd like to make another question about the program, Is it possible to see the degradation of the material? or see how the flame pierces it?

thank you in advance

Miren

steve cochard October 3, 2002 03:32

Re: Nist Fire Dynamic Simulator
 
no that's not possible !

You can see the fire spreading without prescribing the HRRPUA (page 24 of the user manual) but the objects in your domaine are staying as they are.


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