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Unsteady ramp inlet velocity

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Old   March 17, 2021, 12:56
Question Unsteady ramp inlet velocity
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Alice Zanella
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I was wondering if it's possible to add a ramp inlet velocity to an unsteady simulation.

I would like for the velocity to grow for the first 2s as a ramp.

Thank you for your help,

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Old   March 21, 2021, 13:09
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Hi there, "Laminar Backward-facing Step" tutorial might be helpful.
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Old   March 23, 2021, 05:06
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From the code it looks like the method of prescribing inlet profiles is possible for each time step. In the mentioned tutorial it is done for a steady state simulation.

For unsteady you would add a 'inlet_filename' + '_00000.dat' (+ _00001.dat and so on) extension that represent the time iteration. so one inlet file is loaded each timestep. I recommend putting those in an extra folder and then INLET_FILENAME= folder/inlet_filename in the config to not clutter everything

Not really the most elegant way and requires a bit of (most likely python) scripting but it is the most flexibel option imo.

hope that helps

Cheers, Tobi
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boundary condition, inlet, velocity

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