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atwhaley / cfast

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Flaming_Chair fire object causes geometry to halt at single room #86

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
1. load three_rooms sample file
2. run geometry then view
3. single room displays in smokeview
4. change fire to upholstered_chair
5. run geomtetry then view
6. three rooms plus corridor displays in smokeview

What is the expected output? What do you see instead?
step 6 above. step 3 above

What version of the product are you using? On what operating system?
6.2.0.291

Please provide any additional information below.

Please advise the format of the fire database files, especially descriptions of 
the paramters in column 1 of the csv file.

i have compared flaming_chair.o with the other .o files provided as examples 
but can't see why one works and the other doesn't. it might help to know what 
the values in column 1 mean

Original issue reported on code.google.com by Debrain...@gmail.com on 15 Mar 2012 at 12:55

GoogleCodeExporter commented 9 years ago 
sorry, not three_rooms.
Load SmokeAlarm.in

Original comment by Debrain...@gmail.com on 15 Mar 2012 at 1:01

GoogleCodeExporter commented 9 years ago 
I have discovered that this problem occurs also when there is something wrong 
with the fire file (for eg I used Upholstered_Chair.o as a template and then 
changed the HRR values but forgot to make the name of the fire in the header 
line EXACTLY the same as the file name).

Original comment by Debrain...@gmail.com on 16 Mar 2012 at 2:06

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
The program is getting stuck on t=370s (simulation time is 900s) so I've looked 
through the log and see that it complains that Upholstered_Chair.o is in the 
old format and I should update it.
This where I need to know what the format is.

Comparing Upholstered_Chair.o with kiosk.o I see Kiosk.o has an extra column of 
data (all zeroes in this file) but there are no headings to the columns.

Knowing the required format for the fire file is getting urgent now!

Original comment by Debrain...@gmail.com on 16 Mar 2012 at 2:12

GoogleCodeExporter commented 9 years ago 
I took a working version of an my 7 room input file and a Upholstered_chair.o 
and slowly removed vents and rooms to get to a 4 room geometry and 
Upholstered_chair.o and now it's working.
I cannot see what was not right in my previous setup of the same parameters, 
but at least I have something that works.

Original comment by Debrain...@gmail.com on 16 Mar 2012 at 5:57

GoogleCodeExporter commented 9 years ago 
Sounds like it was not the fire object definition that was causing the case to 
fail.  There are times when the equation solver in CFAST gets stuck at a very 
small time step (as your comment #4).  Sometimes it will recover if you wait 
long enough, sometimes it doesn't.

Quite often, just small changes in the input file will make the case work.  
Typically, the model gets stuck when the layer interface is at a transition 
point such as at the top or bottom of a vent.  With certain fire sizes, the 
model will essentially fail to come to a solution.

We'll leave this one open and see if we can identify why the model slows down.

Original comment by cfastdev@gmail.com on 7 May 2012 at 1:18

GoogleCodeExporter commented 9 years ago 
What is the status of this issue?

Original comment by mcgra...@gmail.com on 19 Jul 2013 at 1:48

GoogleCodeExporter commented 9 years ago 
This example works fine now in r1957.

Original comment by rpea...@gmail.com on 2 Mar 2015 at 6:06