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Outlet Boundary condition for Additional Variable |
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June 29, 2012, 06:20 |
Outlet Boundary condition for Additional Variable
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#1 |
Member
Ftab
Join Date: Sep 2011
Posts: 87
Rep Power: 14 |
Hi all,
Making the BC for additional variable which is transported by transport equation in incompressible subsonic flow, I can find seperate box in Inlet BC specification dialogue tab, but not in the outlet. The outlet only asks for the main flow and not for the additional variable. Ho w I should set for instance constant value or flux at the outlet? I do not think that using the source tab, and setting the source flux to zero would be a good option. Thanks, Ftab |
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June 29, 2012, 08:05 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,728
Rep Power: 143 |
No, setting a source flux to zero would not be a good option
It does not ask for a AV boundary condition as none is required. The AV simply convects out of the domain so no boundary condition is required. |
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September 20, 2012, 00:42 |
hello
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#3 | |
New Member
Wang Chao
Join Date: Jul 2012
Location: China
Posts: 8
Rep Power: 13 |
Quote:
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September 20, 2012, 05:36 |
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#4 |
Member
Ftab
Join Date: Sep 2011
Posts: 87
Rep Power: 14 |
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September 20, 2012, 07:31 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,728
Rep Power: 143 |
It is available for openings are flow can enter the domain from an opening and the solver needs to know what AV value to assign it. But as the flow can only exit an outlet there is no need to give boundary conditions to the AV.
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September 21, 2012, 20:07 |
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#6 |
Senior Member
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,171
Rep Power: 23 |
Exactly, the fluid leaves the domain, an additional variable boundary condition would be meaningless.
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September 22, 2012, 01:47 |
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#7 |
New Member
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You must know how to make BC for a subsonic flow case. Since all Riemann's invariants are considered, there must be 4 variables specified at the inlet, only and must be one at the outlet. Say, for example, you can specify u,v,w,p and T and the outlet.
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