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change boundary condition automaticly

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Old   July 18, 2016, 10:51
Default change boundary condition automaticly
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AHF
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amirhossein
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Hi
I simulate something like a cylinder and piston. i have a boundary that is velocity inlet until time 10s, but after that I want to, that it becomes a pressure outlet or outflow boundary condition . how i can do this ?
i know the little that i should use event, but i didn't know how write command.
thanks
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