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Re: [Question #247705]: PFV problems with sedimentation in fluid

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Bruno Chareyre <question247705@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 28 Apr 2014 11:41:38 -0000
Reply-to: question247705@xxxxxxxxxxxxxxxxxxxxx
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Question #247705 on Yade changed:
https://answers.launchpad.net/yade/+question/247705

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
> So if the viscosity of fluid is 0.001Pa.s , I can set the viscosity
value to 0.001, is it true?

If you define pressure in Pa and time in s, yes. Otherwise, you need to be consistent.
I'm afraid I will not have time to test your script in the near future. Donia (above) is already waiting for my help for another PFV problem ;)

Something I missed:
> It is true, the boundary conditions seems not working when flow.bndCondIsPressure is set as zero flux boundary in six sides.

Correct. Incompressible fluid flow with only Neuman-type (no-flux) BCs
is ill-posed. It is enough to impose an arbitrary value of pressure in
one point though. No need to change the boundary condition.

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