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Old   December 25, 2010, 12:59
Default Time-dependent BC's
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Hello,

I have a small problem with time dependent boundary conditions.
I would like to solve rotor-stator problem (periodic subsection). How to obtain change of rotational speed with time? For example: for 0-10 second rotational speed 1000 rpm, for 10-20 s rotational speed 20 000 rpm. I have the same problem with pressure in inlet boundary condition. How to simulate sudden pressure jump in inlet (for example after 5. second)?
I would be grateful for all suggestions.

Regards,
doodek
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Old   December 25, 2010, 17:09
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Glenn Horrocks
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Use a CEL expression to define the rotational speed or pressure as functions of time. You can either use a 1D interpolation function or CEL functions. V12 or earlier you have to use the step() function, V13 you can use if/then statements.
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