Thunderhead Engineering Forum

Public Forum => PyroSim => Topic started by: jk2845 on December 02, 2013, 08:19:41 am

Title: Problem running FDS examples downloaded from http://fds-smv.googlecode.com/
Post by: jk2845 on December 02, 2013, 08:19:41 am
Hi Guys,

I have downloaded the FDS examples for ethanol and n-hexane pool fires and imported them into Pyrosim, however when I try to run FDS it shows that there is a problem with the material (ethanol & n-hexane), has anyone come across this problem and how was it resolved?

Kind Regards John K
Title: Re: Problem running FDS examples downloaded from http://fds-smv.googlecode.com/
Post by: Charlie Thornton on December 02, 2013, 01:27:13 pm
Thank you. I've added a note to the PyroSim issue tracker and we will see what is going on.
Title: Re: Problem running FDS examples downloaded from http://fds-smv.googlecode.com/
Post by: Jon Albrecht on December 04, 2013, 11:59:13 am
John,

Can you give us any more information about what you're trying to do? What you're describing sounds like a bug that was fixed when the second beta (2013.1.1126) was released.

If you are using the initial beta release (2013.1.1122) this bug will still exist. Likewise, if you saved a file in 2013.1.1122 and then opened the file in 2013.1.1126, the bug will still exist.

Please check the version you are using and let us know. If you've already gone through the troubleshooting to make sure that what I described is not the case, include a link to the specific FDS example you are trying to run.

Thanks.
Title: Re: Problem running FDS examples downloaded from http://fds-smv.googlecode.com/
Post by: jk2845 on December 05, 2013, 09:53:05 am
Hi,
I'm trying to run the n heptane example from the Pool Fire examples as linked in the Pyrosim Example Guide, I'm using Pyrosim VERSION 5, under a student licence.
The code I downloaded is shown below, it may be something I'm doing wrong.
The purpose of this work is to model a experimental study which used n-heptane as the fuel.

Kind Regards John K


&HEAD CHID='heptane_1_m', TITLE='Single pan of burning heptane' /

&MESH IJK=32,32,96, XB=-0.8,0.8,-0.8,0.8,0.0,4.8 /


&TIME T_END=600. /

&REAC FUEL               = 'N-HEPTANE'
      FYI                = 'Heptane, C_7 H_16'
      HEAT_OF_COMBUSTION = 44400.
      O                  = 0.
      C                  = 7.
      H                  = 16.
      SOOT_YIELD         = 0.037 /

&MATL ID                     = 'N-HEPTANE LIQUID'
      EMISSIVITY             = 1.
      NU_SPEC                = 1.
      SPEC_ID                = 'N-HEPTANE'
      HEAT_OF_REACTION       = 364.9
      CONDUCTIVITY           = 0.14
      SPECIFIC_HEAT          = 2.2464
      BOILING_TEMPERATURE    = 98.5       
      DENSITY                = 684.
      ABSORPTION_COEFFICIENT = 100. /
    
&MATL ID            = 'STEEL'
      EMISSIVITY    = 1.0
      DENSITY       = 7850.
      CONDUCTIVITY  = 45.8
      SPECIFIC_HEAT = 0.46 /

&SURF ID        = 'N-HEPTANE POOL'
      COLOR     = 'YELLOW'
      MATL_ID   = 'N-HEPTANE LIQUID'
      THICKNESS = 0.1 /

&SURF ID        = 'STEEL SHEET'
      COLOR     = 'BLACK'
      MATL_ID   = 'STEEL'
      BACKING   = 'EXPOSED'
      THICKNESS = 0.003 /

&VENT MB='XMIN', SURF_ID = 'OPEN' /
&VENT MB='XMAX', SURF_ID = 'OPEN' /
&VENT MB='YMIN', SURF_ID = 'OPEN' /
&VENT MB='YMAX', SURF_ID = 'OPEN' /
&VENT MB='ZMAX', SURF_ID = 'OPEN' /

&OBST XB=-.50,0.50,-.50,0.50,0.00,0.05, SURF_IDS='N-HEPTANE POOL','STEEL SHEET','STEEL SHEET' /
&OBST XB=-.50,-.50,-.50,0.50,0.00,0.10, SURF_ID='STEEL SHEET' /
&OBST XB=0.50,0.50,-.50,0.50,0.00,0.10, SURF_ID='STEEL SHEET' /
&OBST XB=-.50,0.50,-.50,-.50,0.00,0.10, SURF_ID='STEEL SHEET' /
&OBST XB=-.50,0.50,0.50,0.50,0.00,0.10, SURF_ID='STEEL SHEET' /

&DUMP DT_HRR=1., SIG_FIGS=4, SIG_FIGS_EXP=2 /

&SLCF PBY=0.0, QUANTITY='TEMPERATURE', VECTOR=.TRUE. /
&SLCF PBY=0.0, QUANTITY='HRRPUV' /

&BNDF QUANTITY='BURNING RATE' /
&BNDF QUANTITY='GAUGE HEAT FLUX' /
&BNDF QUANTITY='WALL TEMPERATURE' /

&TAIL /
Title: Re: Problem running FDS examples downloaded from http://fds-smv.googlecode.com/
Post by: Jon Albrecht on December 05, 2013, 11:50:22 am
John,

I saved a copy of your file and tried running it with the FDS5 executable included in PyroSim 2012. It appears to not run in FDS5 at all. Some of the FDS example files are somewhat outdated. Looking at the code, it appears that it may have even been an example for FDS6 (it does run as expected when using the PyroSim 2013 beta). Hope that helps!