setting Boundary condition for additional variable

fek66 · May 18, 2011, 06:04

HE ALL ;
I want to set Boundary condition for pollutant ( CO) as aditional variable my line source is in the ground a street at level z=0 .
my Boundary parts are
INLET, OUTLET, symetry ( SIDES 1 et 2) , GROUND , TOP , SOURCE
the emission rate from the source is 0.0001 Kg/s.
If any one experienced can help

ghorrocks · May 18, 2011, 07:08

Sounds straight forward. Have you done the tutorials? That will give you some tips on how to get started.

Or what specific problem do you have in setting it up?

fek66 · May 19, 2011, 05:44

thanks ;
firstly, I took a look in tutorial , there is an exemple wich treate smoke dispersion. My case deel with a tracer gaz (SF6) realised from a line source within a street. the emission rate is 0.0001 kg/m^3. To simulate the concentration of SF6 I used an additional varaiable CSF6 with a transport equation .
I choose for CSF6 BC :
INLET Value CSF6 =0
OUTLET ZERO FLUX
SYMETRY ( SIDES) ZERO FLUX
TOP ZERO FLUX
GROUND AND LINE SOURCE CSF6 = 0
the simulate concentration CSF6 = f(Z) seems wrong because the minimum conentration value was located at level z=0 wich is not correct.

May 18, 2011, 06:04	setting Boundary condition for additional variable	#1
fek66 Member anonymous Join Date: Jan 2011 Posts: 42 Rep Power: 15	HE ALL ; I want to set Boundary condition for pollutant ( CO) as aditional variable my line source is in the ground a street at level z=0 . my Boundary parts are INLET, OUTLET, symetry ( SIDES 1 et 2) , GROUND , TOP , SOURCE the emission rate from the source is 0.0001 Kg/s. If any one experienced can help

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May 18, 2011, 07:08		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Sounds straight forward. Have you done the tutorials? That will give you some tips on how to get started. Or what specific problem do you have in setting it up?

May 19, 2011, 05:44		#3
fek66 Member anonymous Join Date: Jan 2011 Posts: 42 Rep Power: 15	thanks ; firstly, I took a look in tutorial , there is an exemple wich treate smoke dispersion. My case deel with a tracer gaz (SF6) realised from a line source within a street. the emission rate is 0.0001 kg/m^3. To simulate the concentration of SF6 I used an additional varaiable CSF6 with a transport equation . I choose for CSF6 BC : INLET Value CSF6 =0 OUTLET ZERO FLUX SYMETRY ( SIDES) ZERO FLUX TOP ZERO FLUX GROUND AND LINE SOURCE CSF6 = 0 the simulate concentration CSF6 = f(Z) seems wrong because the minimum conentration value was located at level z=0 wich is not correct.