FDS 6 Device: GAUGE HEAT FLUX Orientation

[Christine Pongratz]

Hello,

  I am having trouble with my gauge heat flux device. When I set the orientation using IOR, I am receiving an "FDS is improperly set-up" error? I would like to set up gauge heat flux devices around the perimeter of my fire, not attached to an obstruction. I would like the gauge to be facing the fire, so parallel to the flame and fire plume, so I have set the IOR=+/- 1 and 2, which I am receiving an error. Should I be using a different device, or is there another reason I am receiving an error? My code is pasted below, thank you for your help.

&HEAD CHID='devicecheck', TITLE='devicecheck'/

&MESH IJK=100,100,100,XB=0.0,10,0.0,10,0.0,10/

&TIME TWFIN=200./

&REAC FUEL='METHANE', SOOT_YIELD=0.1/

&OBST XB=4.5,5.5,4.5,5.5,0,0, SURF_IDS='BURNER','INERT','INERT'/

&SURF ID='BURNER', HRRPUA = 1000, /

&MATL ID            = 'GYPSUM PLASTER'

      FYI           = 'Quintiere, Fire Behavior'

      CONDUCTIVITY  = 0.48

      SPECIFIC_HEAT = 0.84

      DENSITY       = 1440/

&SURF ID             = 'SIDE_WALL'

      DEFAULT        = .TRUE.

      RGB            = 200,200,200

      MATL_ID        = 'GYPSUM PLASTER'

      THICKNESS      = 0.15 /

        

&VENT XB=1.2,3.5,1.2,3.5,10,10 SURF_ID='FAN1'/

&VENT XB=1.2,3.5,6.4,8.7,10,10  SURF_ID='FAN1'/

&VENT XB=6.4,8.7,1.2,3.5,10,10 SURF_ID='FAN1'/

&VENT XB=6.4,8.7,6.4,8.7,10,10 SURF_ID='FAN1'/

&SURF ID='FAN1', VOLUME_FLUX=4.2/

&VENT XB=10,10,2,8,.3,1, SURF_ID='OPEN'/

&VENT XB=0,0,2,8,.3,1, SURF_ID='OPEN'/

&VENT XB=2,8,10,10,.3,1, SURF_ID='OPEN'/

&VENT XB=2,8,0,0,.3,1, SURF_ID='OPEN'/

&DEVC XYZ=5,3.5,1, QUANTITY='GAUGE HEAT FLUX', ID='GAUGE_HEAT_FLUX1',IOR=1 /

&TAIL/

[Mohamed ASSAL]

Hi Christine,

I think the error is here:
FAN1, FAN2, FAN3, FAN4 not same name for the 4 FAN.
and the volume flux 4.2 is affected to FAN1.

&VENT XB=1.2,3.5,1.2,3.5,10,10 SURF_ID='FAN1'/
&VENT XB=1.2,3.5,6.4,8.7,10,10 SURF_ID='FAN1'/
&VENT XB=6.4,8.7,1.2,3.5,10,10 SURF_ID='FAN1'/
&VENT XB=6.4,8.7,6.4,8.7,10,10 SURF_ID='FAN1'/

&SURF ID='FAN1', VOLUME_FLUX=4.2/

Cheers Mohamed.

2013/6/21, Christine Pongratz <cpo...@terpmail.umd.edu>:

> Hello,
>
> I am having trouble with my gauge heat flux device. When I set the
> orientation using IOR, I am receiving an "FDS is improperly set-up" error?
> I would like to set up gauge heat flux devices around the perimeter of my

> fire, *not attached to an obstruction.* I would like the gauge to be facing

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--
Mohamed ASSAL
Manager and Representative of ASCOMP GmbH Switzerland for North Africa.
Rue Hassiba Ben Bouali N°4 Rouiba Algeria.
Tel: +213 790 541 241
Email: as...@ascomp.ch
Company website: www.ascomp.ch
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[Kevin]

Assuming you are running FDS 5, you want 'RADIATIVE HEAT FLUX GAS'. Search the User's Guide for details.

[Mohamed ASSAL]

Hi Christine,

kevin i ran her file on fds6 i get this error message:

FDS cannot determine which boundary cell to assign.

Cheers Mohamed.

2013/6/22, Kevin <mcgr...@gmail.com>:

> Assuming you are running FDS 5, you want 'RADIATIVE HEAT FLUX GAS'. Search
> the User's Guide for details.
>
> On Friday, June 21, 2013 3:48:15 PM UTC-4, Christine Pongratz wrote:
>>
>> Hello,
>>
>> I am having trouble with my gauge heat flux device. When I set the
>> orientation using IOR, I am receiving an "FDS is improperly set-up" error?
>>
>> I would like to set up gauge heat flux devices around the perimeter of my
>>

>> fire, *not attached to an obstruction.* I would like the gauge to be

> --
> You received this message because you are subscribed to the Google Groups
> "FDS and Smokeview Discussions" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to fds-smv+u...@googlegroups.com.
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> To view this discussion on the web visit

> https://groups.google.com/d/msgid/fds-smv/657d5d42-21a7-40d7-9b15-95ff5ec6530e%40googlegroups.com.

[Christine Pongratz]

Hello Kevin and Mohamed,

Thank you so much for taking the time to respond to this.

Kevin, I am actually running FDS6 for this project. Do either of you
know how I can solve this error "FDS cannot determine which boundary
cell to assign". The grid cell size does line up with the locations of
the vent, so I am not sure how I would change the cell assignment. I
believe you have to use XB coordinates for this device.

- Christine

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[Brian Cohen]

Hey Christine!

 

When you use gauge heat fluxes, incident heat fluxes, or any solid-phase device, I'm almost positive that it needs to be attached to an obstruction, wall, etc. or it will not be function in the FDS file. If you want to find a heat flux value on a location that isn’t on a defined surface you need to establish a boundary file.

 

--Brian

[Kevin]

RADIATIVE HEAT FLUX GAS

[Kevin]

In FDS 6, RC3, there is a way to use Lagrangian particles to record the heat flux at a given point. Beta testers found this to be overly complicated, so I restored 'RADIATIVE HEAT FLUX GAS' in the current FDS 6 source code.

[Ankit]

Hi Christine,

I am also getting the same message while trying to measure heat flux at a point not on the obstruction. Were you able to rectify this error ?