# gas diffusion on a room

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 August 21, 2014, 17:34 gas diffusion on a room #1 New Member   Stratos Join Date: Aug 2014 Location: England Posts: 5 Rep Power: 11 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?

 August 22, 2014, 03:37 #2 New Member   Marek Chodorski Join Date: Aug 2013 Location: Poland Posts: 13 Rep Power: 12 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

 August 22, 2014, 15:25 #3 New Member   Stratos Join Date: Aug 2014 Location: England Posts: 5 Rep Power: 11 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

 August 22, 2014, 18:58 #4 New Member   Marek Chodorski Join Date: Aug 2013 Location: Poland Posts: 13 Rep Power: 12 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. Marek

 April 30, 2018, 05:35 #5 New Member   Akshaya Nachankar Join Date: Sep 2017 Posts: 4 Rep Power: 8 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

 Tags advection, convection, diffusion, simulation, smell, species

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