# Transient boundary conditions

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 November 5, 2007, 11:19 Transient boundary conditions #1 Yannick Guest   Posts: n/a Hello everybody, I'm using fluent 6.2.16 and i have to simulate the inlet manifold of an engine. I'd like to set transient boundary of pressure at the outlet but I understand nothing to the fluent help. Can someone help me?

 November 5, 2007, 16:02 Re: Transient boundary conditions #2 Jason Guest   Posts: n/a Do you mean your B.C at the outle varying with the Time? If it's tru I guss you have to write a UDF to set your B.C correctly.

 November 5, 2007, 16:03 Re: Transient boundary conditions #3 Jason Guest   Posts: n/a Do you mean your B.C at the outle varying with the Time? If it's true I guess you have to write a UDF to set your B.C correctly.

 November 5, 2007, 17:07 Re: Transient boundary conditions #4 Yannick Guest   Posts: n/a yes, they are varying with the time. I heard about UDF, but I don't know how to do. Where can I find some examples?

 November 6, 2007, 06:08 Re: Transient boundary conditions #5 Yannick Guest   Posts: n/a What I need to do is to vary from a wall type condition to a pressure outlet type condition during a time and I don't know what to write in the UDF...

 November 6, 2007, 08:28 Re: Transient boundary conditions #6 Nia Guest   Posts: n/a Yau can actually write it within UDFs and you need to write a simple DEFINE_PROFILE macro. You can also fine some example through UDF manual.

 November 6, 2007, 08:47 Re: Transient boundary conditions #7 Yannick Guest   Posts: n/a Ok, Thank you. I'll try to do this...

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