Fire simulation in warehouse

[hichem...@gmail.com]

Hello ,
I wanted to simulate a fire in one of the pharmaceutical storage sheds,
I built the warehouse from a DWG file, I integrated in the device the flow
volume flow in the gas phase, I also integrated the temperature device.
these devices are time-controlled.
in our store, we actually have a smoke extraction system
and I wanted to simulate a fire to know that in the event of a fire, our system is capable of smoke evacuation
We have 3 fresh air motors with an extraction flow rate of 12000m3/h each, making a total of 36000m3/h modeled on pyrosim as  supply   surface 
We also have 3 exhaust motors for a flow rate of 60000 m3/h modelled on pyrosim as exhaust
I have created a vent add into fire surface for an HRRPUA of 1000.0 kW/m² (just a guess).
When I run the simulation, a warning message appears: "this model is not connected to an ambient pressure boundary condition ; the default mesh boundary is a solid wall and without acess to an exterior opening ADD open vents or ambient HVAC nodes to resolve the issue "
I want to how how to solve error of ambient pressure boundary condition 
From what I have learned about fire modeling on pyrosim, and by the way it is a simple reaction simulation the creation of a supply and an exhaust are the devices to create

Should I create a HVAC systeme ?!! 

Kindly, help me find the solution and the right method for modeling a fire.
Psm file is in attachement 

[fde]

The model does not have a mesh. 

Extract VENTs are not attached to any OBSTructions.

[hichem...@gmail.com]

I've added a mesh on the entire surface , 

but how to attach an extract vents to OBSTructions ? 

Thank's

--
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.
To view this discussion on the web visit https://groups.google.com/d/msgid/fds-smv/98a3aadc-8a25-4556-9f7d-372375fc202dn%40googlegroups.com.

[hichem...@gmail.com]

in advance this all the message that it's shown 

[dr_jfloyd]

Your extract VENTs are floating in mid air. Your walls are 9 ft tall and the vents are at 6 ft. You need to put an OBST behind the VENT if you want them at 6 ft.

[hichem...@gmail.com]

thank u Dr Floyed , 

So all i need to do is the adjust the geometry of the vent , is that correct? 

To view this discussion on the web visit https://groups.google.com/d/msgid/fds-smv/841b17e0-c7b7-4722-a674-f325db7a0886n%40googlegroups.com.