FDS case box_burn_away

[lihy213]

Dear contributors,

Recently I studied pyrolysis of solid, something got wrong when I ran FDS cases prefixed with box_burn_away, like this:

ERROR: Problem with SURF number 1, line number 24 (CHID: box_burn_away1)

ERROR: FDS was improperly set-up - FDS stopped (CHID: box_burn_away1)

But the error message was about the ID of SURF line, which confused me the most.

Could you please check it out?

THANKS

LI

[Er9y714]

Which version FDS are you running?

[lihy213]

6.8.0

[Er9y714]

Can you try with the latest version? The developers give support on the latest version.

[rmcdermo]

We need an input file to diagnose. Thanks

[lihy213]

Like this, and it reminds ERROR: Problem with SURF number 1, line number 24 (CHID: box_burn_away1)

&HEAD CHID='box_burn_away1', TITLE='Test BURN_AWAY feature' / 

The FOAM box is evaporated away by the high thermal radiation
from HOT surfaces. The mass of the box is 0.4^3 m3 * 20 kg/m3 = 1.28 kg.
This should be compared to the final value of fuel density volume integral, 
computed by the first DEVC.

&MESH IJK=10,10,10 XB=-0.3,0.7,-0.4,0.6,0.0,1.0, MULT_ID='mesh' /
&MULT ID='mesh', DX=1.0, DY=1.0, I_UPPER=1, J_UPPER=1 /

&TIME T_END=30. DT = 0.01/

&SPEC ID='METHANE' /

&MATL ID                   = 'FOAM'
      HEAT_OF_REACTION     = 800.
      CONDUCTIVITY         = 0.2
      SPECIFIC_HEAT        = 1.0
      DENSITY              = 20.
      NU_SPEC              = 1.
      SPEC_ID              = 'METHANE'
      REFERENCE_TEMPERATURE= 200. /

&SURF ID                   = 'FOAM SLAB'
      COLOR                = 'TOMATO 3'
      MATL_ID              = 'FOAM'
      VARIABLE_THICKNESS   = T
      BURN_AWAY            = T /

&OBST XB=0.30,0.70,0.30,0.70,0.30,0.70, SURF_ID='FOAM SLAB', BULK_DENSITY=20. /

&SURF ID='HOT', TMP_FRONT=1100., COLOR='RED' /

&VENT PBX=-0.3, SURF_ID='HOT' /
&VENT PBX= 1.7, SURF_ID='HOT' /
&VENT PBY=-0.4, SURF_ID='HOT' /
&VENT PBY= 1.6, SURF_ID='HOT' /
&VENT PBZ= 0.0, SURF_ID='HOT' /
&VENT PBZ= 1.0, SURF_ID='HOT' /

&BNDF QUANTITY='WALL TEMPERATURE' /
&BNDF QUANTITY='MASS FLUX', SPEC_ID='METHANE' /

&SLCF PBZ=0.5, QUANTITY='TEMPERATURE', CELL_CENTERED=T /
&SLCF PBZ=0.5, QUANTITY='DENSITY', CELL_CENTERED=T /
&SLCF PBZ=0.5, QUANTITY='MASS FRACTION', SPEC_ID='METHANE', CELL_CENTERED=T /

&DEVC XB=-0.3,1.7,-0.4,1.6,0,1, QUANTITY='DENSITY', SPEC_ID='METHANE', SPATIAL_STATISTIC='VOLUME INTEGRAL', ID='Mass fuel' /

&TAIL /

[rmcdermo]

Works with latest code, please update your version.