incompressible fluid and rock using Porous Flow THM

[Mariana Rodriguez]

Hello,

I want to model an incompressible fluid and incompressible rock using Porous Flow THM.
How do I do that? How should I define the bulk modulus for both in the input file?
Both are infinite, but how is the right way to do it Porous Flow?

Thanks!
Mariana

[Andrew....@csiro.au]

You possibly can't do what you desire with PorousFlow. But it depends on what you mean by "incompressible" (!) Sometimes when people talk about "incompressible" they have written the Richards-flow equation (for compressible fluids), taken leading order in the fluid compressibility, written in terms of fluid volume, and set fluid compressibility to zero. You should check out the PorousFlow tutorial, which starts with considering such a situation, which is sometimes called "volumetric flow": it uses the PorousFlowBasicTHM approach, and the derivation of the equations is fully explained in the pages that are linked from the tutorial. That's probably what you really want, rather than a true incompressible fluid.

a
________________________________________
From: moose...@googlegroups.com <moose...@googlegroups.com> on behalf of Mariana Rodriguez <malu...@gmail.com>
Sent: Wednesday, 26 September 2018 2:26 PM
To: MOOSE
Subject: incompressible fluid and rock using Porous Flow THM

Hello,

Thanks!
Mariana

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[Mariana Rodriguez]

Hello,
What I want is fluid and rock density only changing with temperature, not pressure.
And I want to impose a thermal expansion coefficients for both of them.

> To view this discussion on the web visit https://groups.google.com/d/msgid/moose-users/1537936928496.93109%40csiro.au.

[Andrew....@csiro.au]

I still think you should read the first few pages of the PorousFlow tutorial and associated derivations. It may be exactly what you want.

Eg, think about: in an isothermal situation, without any rock elasticity, what exactly are your fluid-flow equations, if the fluid density does not depend on porepressure? Most likely you'll write down something like PorousFlowBasicTHM.

a

________________________________________
From: moose...@googlegroups.com <moose...@googlegroups.com> on behalf of Mariana Rodriguez <malu...@gmail.com>

Sent: Wednesday, 26 September 2018 2:59 PM
To: moose...@googlegroups.com
Subject: Re: incompressible fluid and rock using Porous Flow THM

To view this discussion on the web visit https://groups.google.com/d/msgid/moose-users/0973DE8B-096C-40A2-94E1-45ACBB7784C3%40gmail.com.