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Re: [Question #697526]: CHOLMOD warning: matrix not positive definite

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Bruno Chareyre <question697526@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 16 Jun 2021 13:41:03 -0000
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Question #697526 on Yade changed:
https://answers.launchpad.net/yade/+question/697526

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
Hi,
It can happen that LDL fails for numerical reason, then the solver switches to LDLt, which is more stable.
I _could_ be a safe warning.

That said, I'm struggling to understand why you would use periodic FlowEngine with (it seems) a non-periodic problem.
Also this makes no sense in periodic conditions since there are no boundaries:
flow.bndCondIsPressure=[0,0,1,1,0,0]

I hope it helps.

Bruno

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