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Define flux type boundary condition for UDS

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Old   October 7, 2013, 01:43
Default Define flux type boundary condition for UDS
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Hi
I am solving an additional transport equation through UDS say uds0. I would like to define the bounday condition for this through following expression:
\frac{\partial{UDS0})}{\partial{x}}={a}+{b}*{y}

How can I define this.

Thank you
mvee
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Old   October 9, 2013, 07:32
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can anyone respond?
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Old   October 10, 2013, 06:23
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Hi,

I think that you can use DEFINE_PROFILE in your UDF. In the UDF manual says that "You can use DEFINE_PROFILE to define a custom boundary profile that varies as a function of spatial
coordinates or time".
I hope it can help you...
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Old   October 11, 2013, 01:13
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Hi CC

Thanks for your response

You are correct, define_profile is the option. But the thing is I want to have, \frac{\partial{UDS0}}{\partial{x}}, which is not directly possible through define_profile.

What other option can I try?

Thanks
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Old   October 11, 2013, 05:06
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Hi mvee,

What type is your BC?
If it's a wall BC I think that you can use DEFINE_PROFILE to define a F_PROFILE(c,t,i) with your expression and then in
BoundaryCondition->Wall->UDS(0)->SpecifiedFlux
you can select your BC. As the flux option is selected you are given the derivative.
Sorry, I don't know other option that you can use.

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