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How to set a udf like this?

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Old   March 29, 2011, 21:50
Default How to set a udf like this?
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Hi everyone!
I have a contaminated air flow coming in a pipe, concentration not known, must be computed from conservation laws, and in the pipe, I put a sink, it is required that after the flow goes through the sink, the concentration must be 20% of the incoming flow (or 10%, or any specified percentage).
Could you please tell me how to realize this in udf? Or can I set the BCs in another way around udf?
Thank you so much! Any word would be greatly appreciated!!!
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