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June 8, 2009, 04:41 
Modelling turbulent aerosol dispersion

#1 
New Member
Join Date: Jun 2009
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Hi,
I recently started my diploma thesis in physics and am supposed to model aerosol dispersion, but I'm totally new to the topic of CFD, so if anybody could help me with some basic questions I'd really appreciate it. My situation is the following: I inject dust (particle size between 2 and 25 micrometer) into air and measure how far the cloud disperses due to turbulent diffusion. After measuring the vertical distribution of my cloud using a PIV system, I want to compare this to my model, but that's where I got stuck. A friend suggested to use OpenFoam, so my first question is if it's in general possible to model this scenario? Anyone every done this before? And how do I best get started? Thanks for any advice or help! 

June 8, 2009, 04:57 

#2 
Senior Member
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Deltares, Delft, The Netherlands
Posts: 1,685
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Hi Aino
Yes, it would definitely be possible to solve that type of problem. There are different kinds of flow solvers, however if you are not interested in the transient problem, then I would suggest that you choose simpleFOAM with an appropriate turbulence closure model. If the transient part is important, then I would suggest turbFoam. With respect to the advectiondiffusion problem of the particles, then I suppose that a bulkapproach will be the only feasible way to look into the problem, i.e. solve an equation describing the spatial and temporal variation in the concentrations. Here the only significant deviation from a standard advectiondiffusion problem will be the inclusion of a certain fall velocity of the particles. If you have several particles, then you could either make a set of equations each solver for c1 (d < 1mikron), c2 ( 1 mikron < d < 3 mikron), etc. or simply define a representation fall velocity. Good luck and welcome Niels 

June 8, 2009, 07:12 

#3 
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Hey Niels,
thank you for your quick reply. I'll read more about the solvers you suggested and then most likely turn up with new annoying questions 

October 21, 2011, 09:02 
Modelling indoor air purifier

#4 
New Member
theja
Join Date: Oct 2011
Posts: 17
Rep Power: 6 
[QUOTE=ngj;218557]
Hi Aino
Yes, it would definitely be possible to solve that type of problem. There are different kinds of flow solvers, however if you are not interested in the transient problem, then I would suggest that you choose simpleFOAM with an appropriate turbulence closure model. If the transient part is important, then I would suggest turbFoam. With respect to the advectiondiffusion problem of the particles, then I suppose that a bulkapproach will be the only feasible way to look into the problem, i.e. solve an equation describing the spatial and temporal variation in the concentrations. Here the only significant deviation from a standard advectiondiffusion problem will be the inclusion of a certain fall velocity of the particles. If you have several particles, then you could either make a set of equations each solver for c1 (d < 1mikron), c2 ( 1 mikron < d < 3 mikron), etc. or simply define a representation fall velocity. 

October 21, 2011, 09:03 
Modelling indoor air purifier

#5 
New Member
theja
Join Date: Oct 2011
Posts: 17
Rep Power: 6 
dear foamer
myself i am working on the indoor air purifier, where the room consists of 90% air and 10% dust, since i want to see how the particles are moving considering the purifier removes the dust completely with time. please suggest me the solver on which i can work thanking you in advance theja 

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