# UDF Help!

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 July 2, 2013, 08:29 UDF Help! #1 New Member   Join Date: Mar 2009 Posts: 24 Rep Power: 9 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

 July 2, 2013, 20:36 #2 Senior Member   Join Date: Aug 2011 Posts: 315 Rep Power: 13 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.

 July 3, 2013, 04:42 #3 New Member   Join Date: Mar 2009 Posts: 24 Rep Power: 9 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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