Problem in FDS+EVAC

[jjarbong]

I want to make a stair by fds.however when i operate the Smokeview, it doesn't work. Could you find what problem is ? :) 

[TimoK]

Go to: http://www.vtt.fi/proj/fdsevac/index.jsp?lang=en
and there to the "Documentation" subpage:
http://www.vtt.fi/proj/fdsevac/fdsevac_documents.jsp?lang=en

and read the "How to debug your input file: Readme_InputErrors.txt".
The "Readme_InputErrors.txt" is a link to a text file. Follow the steps
there to "debug" your input.

Well, I did run you case and at the stderr channel (the screen usually)
you get (among other things):


 WARNING: Entr AK_Porras problem with XB, mid point facing solid

See the attached png-picture. You ENTR (cyan color) is, indeed, inside
a solit. Thus, it can not operate. Your ENTR is in the ground floor, so put
it at correct place there or define your OBSTs (and holes) correctly for
the ground floor.

Note also that your guiding flow fields of the first floor are not good, they
are not leading to the door YK_Porras, so you "outflow" VENT
definitions are not correct. (Add the SLCF vector slice output for
the evacuation meshes to see the vectors.)

&VENT XB= 30.0,70.0, 29.5,29.5, 5.0, 5.2, SURF_ID='OUTFLOW',MESH_ID='FirstFloor',
        EVACUATION=.TRUE., TRANSPARENCY=0, COLOR='RED' /

&DOOR ID='YK_Porras', IOR = -2,
      FYI = 'Comment line',
      COLOR='RED', KEEP_XY=.FALSE.,
      EXIT_SIGN=.TRUE.,
      TO_NODE='AK_Porras',
      VENT_FFIELD='GroundFloor',
      XYZ= 50.0, 22, 5.0,
      XB = 45.0,55.0, 19.92, 19.92, 5.0,5.0, /

The vent should have the same XB as the corresponding door.
You would have found all  of these things, if you would have
followed the steps told in the file "Readme_InputErrors.txt"...

Note also that in Smokeview use the menu Show/Hide => Geometry =>
Surfaces => Exterior to get rid of the evacuation mesh boundaries that
are by default shown in some color (the exterior boundaries of the
evacuation meshes are "solid" in Smokeview and actually also inside
the FDS flow solver) and you want these to be transparent so that you
can see something...

TimoK

[jjarbong]

I do the things instructed by Timok. you mean that i should correspond vent 12 and YK_Porras's XB. however when i do like this i send the other message :( "Vent 12 must be attached to a solid obstruction".:( why does FDS send the message?  

2012년 4월 5일 목요일 오후 2시 57분 57초 UTC+9, jjarbong 님의 말:

[jjarbong]

I try to change the code as teaching you but the fds send the other message. " Door line YK_Porras problem with XYZ, No mesh found."why does it work?

2012년 4월 5일 목요일 오후 3시 23분 26초 UTC+9, TimoK 님의 말:

2012년 4월 5일 목요일 오후 3시 23분 26초 UTC+9, TimoK 님의 말:

2012년 4월 5일 목요일 오후 3시 23분 26초 UTC+9, TimoK 님의 말:

2012년 4월 5일 목요일 오후 3시 23분 26초 UTC+9, TimoK 님의 말:

[jjarbong]

Timo! I did the things followed you but it also does not work :( Could you check the fds one more? :)

[TimoK]

The error "vent must be attached to a solid obstruction" is a FDS version 5 related
error message. Every VENT should be at a solid obstruction and these solid
obstructions should be at least one grid cell thick if not "jet fans", see the
FDS 5 users guide. Note that the outer boundaries of the evacuation meshes
are solid boundaries, so if your DOOR (or EXIT) is at the outer boundary of
an evacuation mesh, then you can place the "outflow vent" at this boundary
directly without any OBST definition. For DOORs and EXITs that are inside
the evacuation meshes you should define OBSTs that are "behind" these
"outflow vents", use lines like:

 &OBST XB=..., EVACUATION=.TRUE., THICKEN=.TRUE., PERMIT_HOLE=.FALSE., COLOR='whatever you like' /

So, thicken will make it at least one grid cell thick, permit_hole false means that
you are not accidentally destroying it with some HOLE and evacuation true is
used so that this obstacle is not going  to the fire calculation.

Well, I should add the above to the "input errors" text file...

TimoK