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Re: [Question #671365]: hydraulic gradient with PFV-DEM

 

Question #671365 on Yade changed:
https://answers.launchpad.net/yade/+question/671365

Chareyre proposed the following answer:
To compliment 2) by Robert: if permeability factor is set negative it will
be used as (approximate) Darcy permeability. Otherwise permeability is
predicted based on micrstructure and fluid viscosity, then multiplied by
permeability factor in case it is not 1.
B

Le jeu. 9 août. 2018 17:17, Robert Caulk <
question671365@xxxxxxxxxxxxxxxxxxxxx> a écrit :

> Question #671365 on Yade changed:
> https://answers.launchpad.net/yade/+question/671365
>
>     Status: Open => Answered
>
> Robert Caulk proposed the following answer:
> Hello Azim,
>
> 1) Yes, you are imposing a gradient in the Y direction with your
> commands.
>
> 2) Flow engine boundary condition assignments are designed to impose
> "macroscopic hydraulic gradients" on cubical specimens. If you want to
> use this hydraulic gradient to calibrate the macroscopic permeability of
> your sample, you will want to adjust the permeability factor [1] and
> estimate the corresponding macroscopic permeability.
>
> 3) In an attempt to keep this relevant to this thread - if you want to
> see the hydraulic gradient in paraview, you will want to export
> pressures with flow.saveVTK [2].
>
> Cheers,
>
> Robert
>
> [1]
> https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.FlowEngineT.permeabilityFactor
> [2]
> https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.FlowEngineT.saveVtk
>
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