On Tue, May 7, 2024 at 2:23 PM Shatanawi, Sawsan Muhammad via petsc-users <
petsc-users@mcs.anl.gov> wrote:
> Hello everyone, I hope this email finds you well. My Name is Sawsan
> Shatanawi, and I was developing a Fortran code for simulating groundwater
> flow in a 3D system with nonlinear behavio
Yes, easy to solve. It is a kind of Lapalcian that comes up in graph
algorithms.
You mentioned problems with pinned points, with zero displacement.
Conceptually you want to create A'A without any modification for pinned
points. Then remove the rows and columns associated with pinned points.
A'A ha
Have you considered
https://urldefense.us/v3/__https://www.pflotran.org/documentation/user_guide/how_to/installation/installation.html__;!!G_uCfscf7eWS!eZkBlApyezAyEBaDxGemEyUmTe87omvkv59rrf0Mq8L4bOTqEL9wynuMJ1ci9kRDOqucZBiYdGT2tRTVuCSJdSs$
> On May 7, 2024, at 2:22 PM, Shatanawi, Sawsan M
Hello everyone,
I hope this email finds you well.
My Name is Sawsan Shatanawi, and I was developing a Fortran code for
simulating groundwater flow in a 3D system with nonlinear behavior. I solved
the nonlinear system using the PCG solver and Picard iteration, but I did not
get good resul
OK, it’s very trivial to solve with algebraic solvers.
If you are willing to share larger test cases, maybe then some issue will arise
(please do not attach them to your mail, send a URL, if you cannot and must
attach it to your mail, switch to the following mailing list:
petsc-ma...@mcs.anl.gov
The system basically describes the displacements of particles relative to each other due to processes occurring on their interfaces, i. e. vacancy absorption. The idea is to say there's a displacement jump u_a - u_b = du_{a,b}, for every interface
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Pierre, I've attached the dumps of the matrix + RHS for something of about 3k x 1k. Regarding the weird divergence behaviour, I tried again at home but I still get the same results. I am running a rolling release distribution on both machines,
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T
On Tue, May 7, 2024 at 8:28 AM Mark Adams wrote:
> "A^T A being similar to a finite difference Poisson matrix if the rows
> were permuted randomly."
> Normal eqs are a good option in general for rectangular systems and we
> have Poisson solvers.
>
I missed that. Why not first permute back to the
"A^T A being similar to a finite difference Poisson matrix if the rows were
permuted randomly."
Normal eqs are a good option in general for rectangular systems and we have
Poisson solvers.
I'm not sure what you mean by "permuted randomly." A random permutation of
the matrix can kill performance bu
On Tue, May 7, 2024 at 5:12 AM Pierre Jolivet wrote:
> On 7 May 2024, at 9: 10 AM, Marco Seiz wrote: Thanks
> for the quick response! On 07. 05. 24 14: 24, Pierre Jolivet wrote: On 7
> May 2024, at 7: 04 AM, Marco Seiz wrote: This
> Message Is From an External
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> This
> On 7 May 2024, at 9:10 AM, Marco Seiz wrote:
>
> Thanks for the quick response!
>
> On 07.05.24 14:24, Pierre Jolivet wrote:
>>
>>
>>> On 7 May 2024, at 7:04 AM, Marco Seiz wrote:
>>>
>>> This Message Is From an External Sender
>>> This message came from outside your organization.
>>> He
Thanks for the quick response! On 07. 05. 24 14: 24, Pierre Jolivet wrote: > > >> On 7 May 2024, at 7: 04 AM, Marco Seiz wrote: >> >> This Message Is From an External Sender >> This message
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