Issue 598 in fds-smv: Vents are rejected because boundary already has mateiral property vent

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Status: New
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 598 by david.sh...@atf.gov: Vents are rejected because boundary
already has mateiral property vent
http://code.google.com/p/fds-smv/issues/detail?id=598

Please complete the following lines...

Application Version: 5.2.5 Serial
SVN Revision Number: 2828
Compile Date: Wed, 10 Dec 2008
Operating System: XP

Describe details of the issue below:

Vents with OPEN and VOLUME_FLUX are rejected because a VENT with mateiral
properties was already put on the boundary.

&HEAD CHID='Example1'/
&TIME TWFIN=10/
&MESH IJK=48, 64, 16 XB=0, 3, 0, 4, 0, 1 /Room 1
&VENT XB=0, 0, 0, 4, 0, 1 SURF_ID='GYPSUM' /
&VENT XB=0, 0, 0.1, 0.3, 0.1, 0.3 COLOR='BLUE' OUTLINE=.TRUE.
SURF_ID='OPEN' /
&SURF ID='VENT2' VOLUME_FLUX=-0.1 TMP_FRONT=1000 /
&VENT XB=0, 0, 1, 1.2, 0.5, 0.7 COLOR='RED' OUTLINE=.TRUE.
SURF_ID='VENT2' /
&SURF ID='GYPSUM' /
&SLCF XB=0, 3, 0, 4, 0, 1, QUANTITY='TEMPERATURE' VECTOR=.TRUE. /

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Updates:
Status: AltInputs
Owner: drjfloyd
Labels: Application-FDS

Comment #1 on issue 598 by drjfloyd: Vents are rejected because boundary

already has mateiral property vent
http://code.google.com/p/fds-smv/issues/detail?id=598

You can only define one vent for a surface. If more than one vent s
defined for a
surface, FDS has no innate knowledge of which you intend to have
precedence. Thus,
FDS is coded so that first vent defined takes precedence (first caution box
in
section 7.3 of the User's Guide). FDS should only be rejecting the other
vents in
regions that overlap. Move the other VENTs to be before the GYPSUM vent and
then they
should work.

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Comment #2 on issue 598 by david.sh...@atf.gov: Vents are rejected because

boundary already has mateiral property vent
http://code.google.com/p/fds-smv/issues/detail?id=598

Jason,

I am really surprised that I never noticed this before. What if I want to
define
the boundaries of a mesh with a material property and I also want an open
vent on
that boundary? How do I do it?

Example. Mesh is a room with gypsum walls. There is one open window
represented by
a vent with SURF_ID=OPEN .

Dave

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Comment #3 on issue 598 by mcgratta: Vents are rejected because boundary

already has mateiral property vent
http://code.google.com/p/fds-smv/issues/detail?id=598

Prior to FDS 5, the convention used by FDS was to accept the LAST VENT line
rather
than the first whenever there was a conflict. For various reasons, it was
better to
process the first VENT and reject (at least in the overlap region) the
subsequent
VENTs. When I sat in on the SFPE class in Las Vegas, Fall 2007, the issue
came up
repeatedly.

In your example, declare the OPEN VENT first.