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Old   August 21, 2014, 18:34
Default gas diffusion on a room
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Stratos
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Hello,
I am working on a project that includes simulation of smell in a virtual environment (e.g. a room). This environment includes only 2 species, air and let's say ammonia. I am interested in studying how the smell(ammonia) diffusion and convection to the place happens when we know that exists an air velocity flow field that disperses the ammonia. I do understand that I have to couple the governing equations (incompressible form as the smell doesn't move fast) with something that includes the mixing of the 2 species and probably their chemical composition. But somewhere here my knowledge doesn't help me and I need some suggestions...
What do I need to study and how these can be modelled in an openfoam code?
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Old   August 22, 2014, 04:37
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Marek Chodorski
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Hi wmrlak,

Transport equation and sample results you can find here ( 3D unsteady state solution with convection - description is in Polish - Google translator would be good enough):
http://feazone.org/readarticle.php?article_id=11
http://pl.wikipedia.org/wiki/Plik:Vanadis_a1_test.gif
http://pl.wikipedia.org/wiki/Plik:Vanadis_a2_test.gif
Kx, Ky, Kz - diffusion coefficent
P - it depends on chemical reaction (half-time)
vx, vy, vz - velocity field

To solve equation I use finite element method - Galerkin scheme with up-winding)

Regards,
Marek
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Old   August 22, 2014, 16:25
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Hi,
thanks for answering, I want to ask you a couple of questions:
1) The transport equation in your first link looks like a normal transport equation except that it has P*S which I don't know where it comes from. Would you please give some reference?

2)have you implemented using openFOAM?

thanks
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Old   August 22, 2014, 19:58
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Marek Chodorski
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Hi,
Equation you can find here:

Sorbjan Z., Turbulencja i dyfuzja w dolnej atmosferze, PWN, Warszawa, 1983

It concerns pollution transport in the atmosphere but transport equation is the same in the room. Boundary conditions and diffusion coefficents will be different.

I have implemented solution in Fortran.



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Old   April 30, 2018, 06:35
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Akshaya Nachankar
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hie I m trying to simulate propane leakage in closed room. which diffusion model should I use? actually I m confuse if I simulate with species transport model then which options should I select under this model.
plz suggest me. I m just new for CFD
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