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

why do you need that? Is it a transient simulation? Are you talking about "opening" boundary condition?

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?

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

Another method....Use profile boundary condition if you have some experimental data at inlet/outlet...

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?