# time dependent pressure BC on outlet

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 October 22, 2008, 08:05 time dependent pressure BC on outlet #1 sometimes1900 Guest   Posts: n/a Hi CFX user, i would like to set up a time dependent pressure boundary condition on the outlet, e.g. from 0-5s, pressure=0bar; from 5-10s, pressure=1bar; from 10-15s, pressure=0bar and so on. How can this Expression (CEL) be wroten? thank you for your reply in advance.

 October 22, 2008, 10:13 Re: time dependent pressure BC on outlet #2 Rogerio Fernandes Brito Guest   Posts: n/a create (or define) an user function to input your time [s] and pression [N m^-2]. Make an 1D interpolation. Arguments Units: [s] Results Units: [N m^-2] Interpolation Data -> Option -> One Dimensional Create a name.txt file and build your data (time and pression using dot as your decimal separator). After that, choose your pression as name(t) as your boundary condition, where t is the time in [s].

 October 22, 2008, 11:16 Re: time dependent pressure BC on outlet #3 sometimes1900 Guest   Posts: n/a Hi Rogerio, thanx for your reply. As you describled, i have defined an user function (name: function 1) in PRE. But in the outlet window i can not find the user function. How can i put the user function to outlet BC? Best regards

 October 22, 2008, 13:29 Re: time dependent pressure BC on outlet #4 Rogerio Fernandes Brito Guest   Posts: n/a put "function 1(t)" in the box for the outlet. Just it. Donīt use space, in the name of the function. Use: "function1(t)"

 October 24, 2008, 11:14 Re: time dependent pressure BC on outlet #5 Adam Guest   Posts: n/a An easier way would be just to create a CEL expression and input that into the outlet

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