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[Chareyre <question640093@xxxxxxxxxxxxxxxxxxxxx>]

Question #640093 on Yade changed:
https://answers.launchpad.net/yade/+question/640093

Chareyre posted a new comment:
By sub-discretizing the flow path we could account for the gradient of
viscosity at the throat scale, indeed.
The fact is that even at the large scale we do not account for it. We have
a unique value of viscosity which is supposed to apply everywhere in the
problem. I think this is the only approximation.
Do you see another problem in relation with compressibility?
Bruno


On 6 June 2017 at 23:23, Robert Caulk <question640093@xxxxxxxxxxxxxxxxxxxxx>
wrote:

> Question #640093 on Yade changed:
> https://answers.launchpad.net/yade/+question/640093
>
>     Status: Answered => Solved
>
> Robert Caulk confirmed that the question is solved:
> Dear Bruno,
>
> Thank you for the detailed response. At the pore scale of geomaterials,
> I believe the assumption of local linearity vs pressure gradient in the
> pore throat is a safe one since the pore throat is so short compared to
> the pores themselves.
>
> Let's say we really want to incorporate compressibility into the pore
> throat without going full 3D Navier-Stokes. I believe one option is to
> discretize the pore throat and linearize the pressure gradient at each
> point along the discretization. The irony is palpable here, as per your
> post, this is essentially what we are already doing at a larger scale of
> fluid movement through the porous medium. But in my experience, the only
> way to approach a non-linear problem numerically is to linearize it in
> one way or another.
>
>
> Cheers,
>
> Robert
>
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