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Re: [Question #662105]: simulation explodes as soon as flow engine is activated

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Bruno Chareyre <question662105@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 11 Jan 2018 16:22:46 -0000
Reply-to: question662105@xxxxxxxxxxxxxxxxxxxxx
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Question #662105 on Yade changed:
https://answers.launchpad.net/yade/+question/662105

Bruno Chareyre posted a new comment:
Hi,
You are right and the reason for that is that a periodic problem has no boundary, hence no boundary condition.
bndCondIsPressure=[X,X,0,0,X,X] is ok but you need to impose the pressure in one internal pore to fix a reference value (arbitrary).
Adding a constant pressure to a periodic pressure field still results in a valid solution. No unique solution <=> the linear system reflecting the Stokes problem is not inversible if no pressure is imposed anywhere, then crash.  
Bruno

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