Furnace Simulation

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FDS is primarily to simulate natural fires. Can a feature be added so that 
we can conduct furnace simulations?

Original issue reported on code.google.com by khalid.m...@vu.edu.au on 29 May 2007 at 1:14

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What do you feel is missing to be able to simulate a furnace?

Original comment by drjfloyd on 29 May 2007 at 12:42

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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Hi Jason,
I am not sure what is missing to be able to simulate a furnace. Can we have the 
feature to input time-gas temperature curve (similar to time-HRR curve in FDS) 
which 
will be the same for furnace walls as well (so that no heat loss to the furnace 
wall 
takes place). At the same time this time-gas temperature curve should not be 
applicable to the voids within a test specimen (such as plasterboard 
encapsulated 
steel I beam).

More complicated way will be adding the ability to simulate pre-mixed 
combustion.

Last year, I proposed to Kevin to add the ability to simulate furnace tests. He 
replied to me that it was possible by adding some features ( sorry, I cann't 
remember what it was and I lost his email reply).

with regards

Khalid 

Original comment by khalid.m...@vu.edu.au on 30 May 2007 at 12:56

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You can specify time varying inlet boundary conditions of Z_2 and temperature 
(Z_2 = 
products of combustion).  Premixed could also be done with the finite rate 
combustion model.  Surfaces can already be declared adiabatic. 

Given that we are only doing 1D heat conduction, is FDS the appropriate tool 
for a 
detailed analysis of a plasterboard encapsulated steel I beam?  We may not do 
great 
in terms of temperatures at the web-flange connection.

Original comment by drjfloyd on 30 May 2007 at 12:25

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I will try your suggestion though I am bit confused. About I beam modelling, 
can I 
draw your attention to the following paper:

Liang H, Welsh S. Development of an engineering methodology for thermal 
analysis of 
protected structural members in fire, Proceedings of Third International 
Conference 
on Steel and Composite Structures, Manchester, UK, 2007 (to be appeared). 
(https://www.era.lib.ed.ac.uk/bitstream/1842/1531/1/Liang_ICSCS07.pdf)

Regards

Khalid

Original comment by khalid.m...@vu.edu.au on 31 May 2007 at 6:34

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Z_2 = burned fuel.  Say for example that 1 kg of the fuel being used requires 9 
kg 
of air per kg of fuel.  Then at stoichiometry you would have 1 kg of fuel in a 
total 
mass of 10 kg and if that was fully combusted Z_2 = 1/(9+1) = 0.1.  Lets also 
say 
that c_p of the gas mixture is 1 kJ/kg-K and delta_h is 10000 kJ/kg.  We can 
add 
that amount of energy by saying that the 10 kg/s of incomming mass (of which 10 
% is 
fuel) has a temperature of TMPA+1000 (10000 kJ/kg fuel* 1 kg fuel / (1 kJ/kg-K) 
/ 
(10 kg)=1000 K).

Based on your comment about voids I was envisioning the following:

CCCCCCCCC
WSSSSSSSW
W   S   W
W   S   W
W   S   W
WSSSSSSSW
WWWWWWWWW

Where S is steel, W is wall board, and c is whatever the ceiling is made of.  
FDS 
does 1D heat trasnfer so:

WS  
WW  

Here we cannot get the combined contributions to the beam from both sides of 
corner.  The "S" is treated as two seperate 1D calcs.

 S
SSS
WWW  

Same here.  The S at the junction of the flange will be treated as three 
seperate 
calcs: one for the W, one for the S to the left, and one to the right.

Add to that the uncertainties added by the additional convection calc within 
the 
void.  You may be better off (depeding on what question you are ultimately 
trying to 
answer) of taking the effective adiabatic temperature to the wallboard and 
using it 
as an input to a 22 or 3D thermal-structural code.

Original comment by drjfloyd on 31 May 2007 at 3:10

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Since there has been no futher traffic in a while on this issue, I am going to 
assume that the current capabilities in FDS are sufficient for your problem and 
will 
close this issue.  If that is not the case it can be reopened it at a later 
date.

Original comment by drjfloyd on 6 Jun 2007 at 7:58

• Changed state: WontFix