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changing buondary conditions during the time

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Old   May 22, 2014, 03:40
Question changing buondary conditions during the time
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Hi everybody!
I have 2 boundary conditions in my problem and want to replace them with each other during the time.
For example, changing "velocity inlet" B.C. to "Pressure outlet" after 5 minutes and then back to the first case.
This procedure continues periodically to end of the running program.
How can i do this?
Thank you in advance.
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