[FLASH-USERS] boundary conditions changing with time

[Julia Grott]

Hello everybody,
I'm a starting flash user, and I wonder if I can make boundary conditions
that will change with time.
To be more precise I'm trying to model a jet ( an outflow of matter) which
will turn on and off at certain moments of time. (Something like: if t< 5
sec, then turn on jet, else turn off. )
How can I do something like a timer?
Maybe I don't need to vary boundary conditions, but just to add proper
conditions in the Simulation_initBlock, which can be  turned off after
certain time.

I will be happy to hear any ideas,
Thanks in advance!

Julia
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