[petsc-users] issues with VecSetValues in petsc 3.19

[Edoardo alinovi]

Hi Matt,

thanks for sharing the literature.

Would you suggest any monolitic approach for the mpiaij/mpibaij matrix
instead of fieldsplit?

I did some blind search using gamg/hypre and they look terribile. I guess i
am missing a trick, probaly they are not the way to go?

Thanks!

Il Lun 17 Apr 2023, 13:50 Matthew Knepley <knepley at gmail.com> ha scritto:

> On Mon, Apr 17, 2023 at 6:37 AM Edoardo alinovi <edoardo.alinovi at gmail.com>
> wrote:
>
>> Sure thing, the solver I am working on is this one:
>> https://gitlab.com/alie89/flubio-code-fvm.
>>
>> It is a 3D, collocated, unstructured, finite volume solver for
>> incompressibility NS. I can run steady, unsteady and I can use SIMPLE, PISO
>> and Factional step method (both explicit and fully implicit momentum). I
>> can also solve for turbulence (k-omega, BSL, SST, Spalart-Allmars, LES). I
>> have also implemented some kind of Immersed boundary (2D/3D) that I need to
>> resume at some point.
>>
>> Hot topic of the moment, I am developing a fully coupled pressure based
>> solver using field-split. What I have now is working ok, I have validated
>> it on a lot of 2D problems and going on with 3D right now.  If all the
>> tests are passed, I'll focus on tuning the field splitting which looks to
>> be a quite interesting topic!
>>
>
> I think a very good discussion of the issues from the point of view of FEM
> is
>
>    https://arxiv.org/abs/1810.03315
>
> There should be a similar analysis from the FVM side, although it might
> not be possible to
> find a pressure discretization compatible with the FVM velocity for this
> purpose.
>
>   Thanks,
>
>      Matt
>
>
>> Flubio is a project I have been carrying on since PhD days. The
>> implementation is 99% on my shoulders, despite the fact I am
>> collaborating with some people around. I am coding evenings and
>> weekends/free time, it gives me a lot of satisfaction and also a lot of
>> insights!
>>
>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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