On 1/15/19 10:02 AM, ntets...@berkeley.edu wrote:
> thank you for replying. I have looked thoroughly step 45 but it's not of much
> help for my case. I actually want to impose periodic boundary conditions for
> both velocities and pressure (I need to have a representative periodic cell).
Is this really what you want to do? Can you elaborate on your setup?
I'm asking this because generally, mathematically speaking, you can only
impose the *stress* at the boundary, not the pressure alone. Second, if you
think for example about an infinite pipe and you cut a piece out, then at the
left and right end of that pipe segment, you can enforce that the velocity is
periodic -- but the pressure will *not* be periodic, as there will be a
pressure drop along the pipe which counters the friction forces.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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