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Add diffunding concentration into LES simulation

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Old   September 10, 2015, 13:47
Default Add diffunding concentration into LES simulation
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Pablo Ernesto Romero
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Hi everybody,

I am running transient LES simulations with pisoFoam (Smagorinsky model) and a Reynolds number of about 1000. I am trying to add on some nodes (or a specified surface) a concentration that is diffunding into the fluid and transported with the flow. I am interested in how this concentration gets transported through the geometry.

How must I proceed if want to add any concentration in some cells of the field and just let it diffuse in the fluid?

Thx
Pablo
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Old   September 10, 2015, 17:08
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Krishna
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If the source of concentration is on a boundary cells, define the cells with a set of concentration using a patch on the surface. And then use the patch name for you concentration inlet boundary condition.

Have a look at the following tutorial to add a transport equation to icoFoam:

https://openfoamwiki.net/index.php/H...ure_to_icoFoam

http://www.tfd.chalmers.se/~hani/kur...ngTutorial.pdf
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Old   September 12, 2015, 14:26
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Pablo Ernesto Romero
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Thx a lot rkc.cfd! I followed the tutorial and a simulation is running!

What if the source of concentration is NOT on boundary cells. I want to select some cells of the domain.. How can I do that?
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Old   September 12, 2015, 18:50
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Krishna
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I have no clue how to do it. I suppose you can use the baffle option, but I have not used it though. I hope some one has done that in the forum and I am also curios about it. About baffles:

https://openfoamwiki.net/index.php/CreateBaffles
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les, pisofoam, smagorinsky, transient

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