Re: HELP (Smoke Simulation) 'Fluent"

Amr wrote:

Hi everyone,

I am simulating a 2D smoke event -using Fluent 6- in a simplified
atrium as rectangular room with two openings in cieling (one vent and
one exhaust fan) and an inlet air opening on one side wall. The rest
sides "edges" are modelled as wall. Smoke is modelled as "Mass and
energy source" mixture of CO2 and CO without using a combustion model.
Now I need guidance in the following issues:

1- As for the smoke modeling, if I wanted to model O2 depletion due to
combustion, could I put an O2 sink in the same fluid zone that I put a
CO, CO2 sources in? How?

2-As for Boundaries, I have set the inlet air space as Pressure inlet,
the exhaust opening as Exhaust Fan and the vent opening as outlet vent.
Is this correct?. Any ideas from your previous work?. I got repeatedly
a stiff converged solutions and velocity contours are unrealistic.

3-When setting boundaries, in the exhaust fan BC, a species fraction is
requested. Now, since the species fraction is one variable that I need
to know after simulation, how does Fluent request its value before
hand?. Is there a way to force Fluent to calculate the species fraction
at Exhaust fan or Outlet vent BC?

If anybody has an experience with similar simulation, please let me
know. Would appreciate your help so much. Thanks for your time.

Amr




Dear Amr,

Sorry, I cannot help you with your problems with Fluent,
as I do not use that package. However, if you are doing fire and
smoke simulation I ighly recommend that you take a look at
what has been done at NIST. See, for example,

http://fast.nist.gov/
http://www.bfrl.nist.gov/866/fmabbs.html
http://www.fire.nist.gov/bfrlpubs/

Olin Perry Norton

.

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