CO concentration problem

[Javed Iqbal]

Hi,

I'm trying to get CO concentration in a single rectangular enclosure model before applying in a complex problem and defined following important parameters for CO visualization: 

&MISC CO_PRODUCTION=.TRUE./

&REAC ID='HEPTANE',

     

  C=7.0,

  H=16.0,

  O=0.0,

  N=0.0,

  CO_YIELD=0.006,

  SOOT_YIELD=0.015/

I'm getting following CO concentration in smokeview which seems like 10 ppm max. I'm using FDS 5.5.3 version.

Any help on this would be highly appriciated.

Thanks in Advance,

--

Javed Iqbal, LEED AP, CEA

Energy Analyst 

[dr_jfloyd]

By default smokeview sets the colorbar using percentile limits where smokeview picks the upper and lower bounds of the color bar by taking the maximum and minimum values that remain AFTER the 99th percentile and 1st percentile values are removed.  If you want to see the entire range of data in the color bar you will need to use the File Bounds  dialog box in smokeview.

[Javed Iqbal]

Thank so much for your help. 

I'm going through following research papers and some more and found in a typical enclosed fire scenario the CO concentration are in the range of 200-2000 ppm whereas i'm getting very low concentration. I've included input file for reference. : 

1. Fire-induced smoke control via hybrid ventilation in a huge transit terminal subway station

Ran Gaoa, Angui Li a, Xinpeng Haoa, Wenjun Lei, Yujiao Zhaoa, Baoshun Dengb 

2. Numerical Predictions of Smoke Movement in a Subway Station Under Ventilation

Won-Hee Park, Dong Hyeon Kim1, Hee-Chul Chang

Any comments would be highly appreciated. 

&HEAD CHID='CO_validation'/

&TIME T_END=500.0/

&MISC CO_PRODUCTION=.TRUE./

&MESH ID='MESH', IJK=60,60,12, XB=0.0,20.0,0.0,20.0,0.0,3.0/

&MESH ID='MESH02', IJK=30,30,12, XB=5.33333,15.3333,4.66667,14.6667,3.0,10.0/

&REAC ID='HEPTANE',

      FYI='Heptane, C_7 H_16',

      C=7.0,

      H=16.0,

      O=0.0,

      N=0.0,

      CO_YIELD=0.006,

      SOOT_YIELD=0.015/

&DEVC ID='GAS', QUANTITY='VOLUME FRACTION', SPEC_ID='carbon monoxide', XYZ=10.0,8.66667,5.0, ORIENTATION=0.0,0.0,5.0/

&SURF ID='fire',

      COLOR='RED',

      HRRPUA=1000.0,

      RAMP_Q='fire_RAMP_Q'/

&RAMP ID='fire_RAMP_Q', T=0.0, F=1.0/

&RAMP ID='fire_RAMP_Q', T=100.0, F=1.0/

&RAMP ID='fire_RAMP_Q', T=101.0, F=0.0/

&OBST XB=2.66667,3.66667,1.33333,2.33333,0.0,0.1, SURF_ID='fire'/ Obstruction

&SLCF QUANTITY='TEMPERATURE', VECTOR=.TRUE., PBX=10.5/

&SLCF QUANTITY='VELOCITY', VECTOR=.TRUE., PBX=13.3333/

&SLCF QUANTITY='VOLUME FRACTION', SPEC_ID='carbon monoxide', PBX=3.33333/

&SLCF QUANTITY='VOLUME FRACTION', SPEC_ID='carbon monoxide', PBX=8.0/

&TAIL /

Thanks,

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[dr_jfloyd]

Does your REAC in represent the fuel that is burning in your referenced papers?
Does your fire in represent the fires (size, ventilation, etc.) in your referenced papers?

[Javed Iqbal]

Fires size is same as research papers (tried different sizes) but fuel might be different. 'll check and read more fire dynamics fundamental to understand this better.

Thanks for your inputs.

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