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how to set complex boundary condition, namely a developed velocity in inlet of pipe?

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Old   December 30, 2015, 16:01
Default how to set complex boundary condition, namely a developed velocity in inlet of pipe?
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Milad Setareh
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Hi

can anyone help me to write a complex boundary condition without swak4foam? I wanna set developed velocity boundary condition in inlet of pipe, its formula is:

V=V_max*[1-(r/R)^2]

openfoam has simple boundary condition type such as "fixedvalue, fixedgradient and mixed" . How can I implement a variable Bc with posotion without swak4Foam?

thanks
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Old   December 30, 2015, 18:39
Default codedFixedValue b.c.
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Fumiya Nozaki
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Hi,

You can use the codedFixedValue condition.

Best regards,
Fumiya
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Old   January 4, 2016, 05:50
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Milad Setareh
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dear fumiya

can you write me correct form of this Bc with codedfixedvalue.?
tnx
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Old   January 4, 2016, 10:46
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Hi,

You might want to give it a try for improving your understanding.
There are some good materials on this topic:
http://www.sourceflux.de/blog/the-co...dary-condition

And, there is parabolicVelocity condition implemented in foam extend:
https://github.com/Unofficial-Extend...abolicVelocity

Hope this helps,
Fumiya
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