The correct BCs for defining an "open room".

suitup · March 8, 2010, 05:28

Hello dear Foamer,

I am struggeling for some time with the problem defining the boundary conditions correctly.

What is my aim?

The domain should be an "open room", that means there is a free air exchange, so that air can flow into the domain and as a result the domain's temperature is always constant. As an example 293 kelvin.

I don't find the correct BC-parameter for my domain, so the simulation always aborts and/or there is no really air exchange.

If I define all boundaries as walls, the simulation is working stable, but then there won't be any fresh air exchange and the air heats up.

So maybe some of you have experience with this issue and can help me a bit

Best regards.

shirazbj · March 8, 2010, 06:18

which slover are you using?

I am also interted in room ventilation.

suitup · March 8, 2010, 06:35

Hi,

I am using the chtmultiregion-solver, but actually there shouldn't be so much difference between the solvers I guess (or hope

)

gregor · March 8, 2010, 14:32

hi

you should have a look at the interFoam tutorial for the use of atmospheric boundary conditions

March 8, 2010, 05:28	The correct BCs for defining an "open room".	#1
suitup Member Join Date: Jun 2009 Location: Germany Posts: 38 Rep Power: 17	Hello dear Foamer, I am struggeling for some time with the problem defining the boundary conditions correctly. What is my aim? The domain should be an "open room", that means there is a free air exchange, so that air can flow into the domain and as a result the domain's temperature is always constant. As an example 293 kelvin. I don't find the correct BC-parameter for my domain, so the simulation always aborts and/or there is no really air exchange. If I define all boundaries as walls, the simulation is working stable, but then there won't be any fresh air exchange and the air heats up. So maybe some of you have experience with this issue and can help me a bit Best regards. Last edited by suitup; March 8, 2010 at 06:36. Reason: spelling

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March 8, 2010, 06:18		#2
shirazbj Senior Member Cean Join Date: Feb 2010 Posts: 128 Rep Power: 17	which slover are you using? I am also interted in room ventilation.

March 8, 2010, 06:35		#3
suitup Member Join Date: Jun 2009 Location: Germany Posts: 38 Rep Power: 17	Hi, I am using the chtmultiregion-solver, but actually there shouldn't be so much difference between the solvers I guess (or hope )

March 8, 2010, 14:32		#4
gregor Member Gregor Olenik Join Date: Jun 2009 Location: http://greole.github.io/ Posts: 89 Rep Power: 17	hi you should have a look at the interFoam tutorial for the use of atmospheric boundary conditions