Add diffunding concentration into LES simulation

Pablo Romero · September 10, 2015, 14:47

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

rkc.cfd · September 10, 2015, 18:08

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

Pablo Romero · September 12, 2015, 15:26

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?

rkc.cfd · September 12, 2015, 19:50

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

September 10, 2015, 14:47	Add diffunding concentration into LES simulation	#1
Pablo Romero New Member Pablo Ernesto Romero Join Date: Sep 2015 Posts: 2 Rep Power: 0	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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September 10, 2015, 18:08		#2
rkc.cfd Member Krishna Join Date: Jun 2012 Posts: 33 Blog Entries: 1 Rep Power: 14	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

September 12, 2015, 15:26		#3
Pablo Romero New Member Pablo Ernesto Romero Join Date: Sep 2015 Posts: 2 Rep Power: 0	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?

September 12, 2015, 19:50		#4
rkc.cfd Member Krishna Join Date: Jun 2012 Posts: 33 Blog Entries: 1 Rep Power: 14	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