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an outlet boundary condition

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Old   June 24, 2013, 07:16
Default an outlet boundary condition
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kob
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Hello everyone
I am confusing by an outlet boundary condition.The expression of the variable at outlet is:
Code:
d(phi)/dn=(u x e_z) dot n
where
u is the velocity vector,it is an variable also.
e_z is  the z axis unit direction vector(0 0 1). 
n is the unit normal
Can you tell me how can I realize this boundary condition?

Thank you very much!

best regards!

bryant

Last edited by bryant_k; June 24, 2013 at 09:22.
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Old   June 27, 2013, 00:59
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kob
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Hello everyone
If someone knows about this,I hope you can give me some advice.I have no idea about it.What kind of boundary condition can I use?

Thank you very much!

regards!

bryant
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