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Old   July 2, 2013, 08:29
Default UDF Help!
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I am new on UDF. Just wonder if anybody can help me.

I have an velocity inlet boundary, and an outlet pressure boundary. I need to setup the outlet pressure is a fixed ratio to inlet pressure. As inlet pressure is calculated in running, and the outlet pressure will be varied with it. I am thinking to use UDF to achieve it. But how, I ahev no idea. Could anybody give me some clue. I know how to setup a varied inlet velocity by UDF. thanks
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Old   July 2, 2013, 20:36
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So you are solving the compressible flow problem?
Technically
Code:
DEFINE_EXECUTE_AT_END
along with
Code:
DEFINE_PROFILE
and a file scope variable could do the job, but you need be more concerned on the physical interpretation of the boundary condition as such.
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Old   July 3, 2013, 04:42
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many thanks, blackmask.

I am doing a compressible flow simulation. It is a single fan blade, the pressure ratio is 1.455. That's why I am considering a outlet pressure condition, which will be related to inlet pressure by 1.455. The inlet is velocity inlet boundary. am I right?
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