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How to preven reverse flow in pressure outlet

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Old   June 17, 2014, 16:22
Default How to preven reverse flow in pressure outlet
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khaled yousef
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hi All,
I am trying to model steam condensation and i have problems with reverse flow at pressure outlet. If i will set the volume fraction for secondary phase equal to 1 then the domain is filled with secondary phase. How we can prevent any phases to enter the domain and the outlet can be used only when no reverse flow to exhaust the flow.
Any help and suggestions will be nice.
Thanks
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Old   June 18, 2014, 07:45
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munjal shah
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hie khaled,
what is oultlet BC?. mainly it happens due to incorrect BC. try it by velocity outlet/pressure outlet/outflow etc.
hope this will help
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Old   June 18, 2014, 10:08
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khaled yousef
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Thanks Munjal for your reply,
I tried all these Bcs but i still face the reverse flow. Due to condensation the pressure decrease and suck flow from the outlet boundary. I know that the only way is UDF to allow flow to go out only through boundary and in case of reverse flow it blocks the outlet and the outlet works as wall.
Thanks again
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Old   June 21, 2014, 17:17
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Bora
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Hi Khaled,

I have about the same issue, did you find a solution for that?

http://www.cfd-online.com/Forums/flu...luid-flow.html
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Old   June 26, 2014, 12:41
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khaled yousef
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Quote:
Originally Posted by Boreas View Post
Hi Khaled,

I have about the same issue, did you find a solution for that?

http://www.cfd-online.com/Forums/flu...luid-flow.html
No, i still have the same problem with reverse flow at outlet due to condensation inside the domain. Please, let know if you have any solution for this issue .
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Old   June 26, 2014, 14:20
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Ender Demirel
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You can apply a nonreflecting boundary condition for velocity components at the outlet section to prevent reflections. Sommerfeld boundary condition is a good choice for nonreflecting boundary conditions. You can find some applications of Sommerfeld boundary condition in my blog:
http://cfd-civil.blogspot.com.tr/
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Old   June 29, 2014, 22:57
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Is it new design or it is in test. Would like to know what's reality with that geometry. Also pls explain geom details.
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