# Inlets - Outles activation time

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 December 13, 2005, 13:24 Inlets - Outles activation time #1 Chucho Guest   Posts: n/a Is there any way to define the time at which the inlets and outlets should be opened? Is there any way of defining a kind of algorithm that rules the opening and closing activity of inlets? any help would help, tx

 December 14, 2005, 03:51 Re: Inlets - Outles activation time #2 TB Guest   Posts: n/a why do you need that? Is it a transient simulation? Are you talking about "opening" boundary condition?

 December 14, 2005, 15:07 Re: Inlets - Outles activation time #3 Chucho Guest   Posts: n/a Yes it is a transient simulation, i have inlet and oulet boundary conditions that works as fans or grilles, and what i need is to simulate the activation of this fans and the opening and closing of grilles. So is there any way to set this times?

 December 15, 2005, 07:09 Re: Inlets - Outles activation time #4 Martin Guest   Posts: n/a that's pretty easy If you want to set e.g. inletvelocity to 10 m/s at 5 s you can write to the velocity at your inlet step(5-Time/1[s])*0[m/s] + step(Time/1[s]-5)*10 [m/s] step return 0 if the expression is <=0 and 1 if >0 you have to work without dimension within step, so you need Time/1[s]. bye martin

 December 15, 2005, 08:31 Re: Inlets - Outles activation time #5 TB Guest   Posts: n/a Another method....Use profile boundary condition if you have some experimental data at inlet/outlet...

 December 20, 2005, 12:24 Re: Inlets - Outles activation time #6 Chucho Guest   Posts: n/a When I look into the inlet properties the Profile Boundary option is disabled. How can I activate this option so I can enter experimental inlet data?

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