localized leaks to ambient air

[Thushadh Wijesekere]

Hi

I have prepared an FDS file to look at the smoke leak from a 40ft cargo container. The vent provides a path for the smoke to move from the inside to the ambient air outside.

i get error when trying to run the code: 

''ERROR: VENT 6 must be attached to a solid obstruction (MPI Process: 0, CHID: smoke_leak_40ft_localized)''

the leakage area is 7cm2. I followed section 12.3.2 - localized leaks on the guide.

I can see that the vent is on the obst surface.

let me know what is wrong here.

i have made a simplified test case:

&HEAD CHID='smoke_leak_40ft_localized', TITLE='smoke leaking analysis from a 40ft container' / cell size = 20cm
&TIME T_END=60.0 /
&MISC TMPA=35.0, RESTART=F /
&DUMP DT_DEVC=1.0, DT_SLCF=2.0, DT_RESTART=150.0 /

==========================mesh=============

&MESH ID='mesh', IJK=71,23,15, XB=-1.0,13.2,-1.0,3.6,0.0,3.0 /

========================open boundary condititon==============

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

================localized leak==================

&VENT ID='leak01_vent', XB=1.0,1.2,0.0,0.0,2.0,2.2, SURF_ID='container' /
&HVAC ID='leak01', TYPE_ID=LEAK, VENT_ID='leak01_vent', VENT2_ID='AMBIENT', AREA=0.0007 /

========================container geometry=======================

&OBST ID='floor', XB=0.0,12.2,0.0,2.6,0.0,0.0, SURF_ID='container' /
&OBST ID='ceiling', XB=0.0,12.2,0.0,2.6,2.4,2.4, SURF_ID='container', COLOR='INVISIBLE' /
&OBST ID='side_panel_1', XB=0.0,12.2,0.0,0.0,0.0,2.4, SURF_ID='container', COLOR='BLUE' /
&OBST ID='side_panel_2', XB=0.0,12.2,2.6,2.6,0.0,2.4, SURF_ID='container', COLOR='BLUE' /
&OBST ID='side_panel_3', XB=0.0,0.0,0.0,2.6,0.0,2.4, SURF_ID='container', COLOR='BLUE' /
&OBST ID='side_panel_4', XB=12.2,12.2,2.6,2.6,0.0,2.4, SURF_ID='container', COLOR='BLUE' /

=======================materials============================

&MATL ID='steel',
      SPECIFIC_HEAT=0.46,
      CONDUCTIVITY=45.8,
      DENSITY=7850.0,
      EMISSIVITY=0.95 /
     
============SURFs================================================

&SURF ID='container',
      MATL_ID='steel',
      THICKNESS=0.002,
      COLOR='BLUE' /
     
&SURF ID='a_generic_fire',
      HRRPUA=1000.0,
      COLOR='RED' /
     
======================fuel properties=================
     
&REAC FUEL='PROPANE',
      SOOT_YIELD=0.01 /
     
=======================burner geometry================================
     
&OBST XB=5.76,6.72,0.96,1.6,0.0,0.32, SURF_IDS='a_generic_fire','INERT','INERT' /

&TAIL /

[fde]

Side_panel_1 has zero thickness. If you give a thickness at least 1 cell, it will work. 

Secondly,

Change this 

&HVAC ID='leak01', TYPE_ID=LEAK,

to
&HVAC ID='leak01', TYPE_ID='LEAK',

However, the container is not a sealed compartment and therefore there is only one Zone, ambient. So Leak model might not work how it is intended. 

[dr_jfloyd]

The localized leakage model does not require different pressure zones on either side of the leak. 

[Thushadh Wijesekere]

thank you very much for the help.