Hi Edscott,
I just committed Mandel's problem to the fully-coupled branch of the
Beck2019a module.
I used the description from Phillips and Wheeler:
https://link.springer.com/article/10.1007/s10596-007-9045-y
For unknown reasons, their storage term is slightly different from the
one we use. In details, it comes down to how the porosity change is
described. So to match the analytical solution, the change in porosity
is (co * p + alpha * div u) for Mandel's problem while all other problem
use (phi_0 + alpha * div u).
Let me know if you have further questions!
Cheers,
Martin
On 3/1/19 10:28 PM, Ed Scott Wilson Garcia wrote:
Thank you very much Martin.
When I change the boundary conditions on the 2.12 el2p test, the
second episode will not work. I’ll try it with the SuperLU solver. The
initialization episode has no apparent problem with amg.
I look forward to studing your implementation of the Mandel problem. I
tend to believe all my problems arise from my incorrect understanding
of the initial and boundary conditions.
best regards,
Edscott
*De:*Dumux [mailto:dumux-boun...@listserv.uni-stuttgart.de] *En nombre
de *Beck, Martin
*Enviado el:* viernes, 1 de marzo de 2019 06:38 a. m.
*Para:* DuMuX User Forum
*CC:* Manuel Coronado Gallardo
*Asunto:* Re: [DuMuX] el2p issue almost clear
Hi Edscott,
the momentum balance for the geomechanics is formulated in an
incremental way. That meens it only considers changes with respect to
the initial state. Nonetheless, the initial stress state matters for
post-processing routines such a the evaluation of the total principal
stresses and the failure criteria.
I have another suspicion for your troubles: The standard test in the
2.12-release uses the el2p-amgbackend, which seems to cause problems
for some cases. For that reason, I switched to a direct solver
(SuperLU) for my examples. Maybe this is reason why your problem now
works, too?
One more thing: I managed to implement Mandel's problem this week for
the fully coupled version of the code. It works fine and reproduces
the analytical solution quite well. I was trying to implement it also
for the decoupled version, but I ran into some problems. Anyway, I
will commit the fully coupled version to the Beck2019a module on
Monday (I am out of office today), so you can look into it.
Cheers,
Martin
------------------------------------------------------------------------
*From:*Dumux <dumux-boun...@listserv.uni-stuttgart.de
<mailto:dumux-boun...@listserv.uni-stuttgart.de>> on behalf of Ed
Scott Wilson Garcia <edsc...@imp.mx <mailto:edsc...@imp.mx>>
*Sent:* Thursday, February 28, 2019 11:50:39 PM
*To:* DuMuX User Forum
*Cc:* Manuel Coronado Gallardo
*Subject:* [DuMuX] el2p issue almost clear
One further question, the force that presses down on the grid from the
top, is that not a boundary condition?
I see from the code that it is used to set the initial total stress
field (isotropic, lithostatic),
(i.e. stress[] = brineDensity_ * porosity * gravity * (depthBOR_ -
globalPos[dim-1])
+ (1 - porosity) * rockDensity * gravity *
(depthBOR_ - globalPos[dim-1]);).
If I do not use the force to set a Neumann boundary condition for uy,
and instead use the values Beck2019 uses (all Neumann values set to
zero),
the initialization of the El2P_TestProblem problem runs just fine
with data from the Sangnimnuan 2018 paper (injection episode turned off).
If I am not wrong about this, then my whole trouble was with that
misleading fact.
Code from the fullycoupled examples has been most useful, and the
decoupled is very interesting. And I thank Bernd and Beck very much.
Best regards,
Edscott
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*******************************************************
Martin Beck
Institute for Modelling Hydraulic and Environmental Systems
Department of Hydromechanics and Modelling of Hydrosystems
Pfaffenwaldring 61
D-70569 Stuttgart
Tel.: (+49) 711/ 685-64899
martin.b...@iws.uni-stuttgart.de
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