[petsc-users] DMPlex Fortran examples

[Matthew Knepley]

On Mon, Mar 4, 2013 at 7:50 PM, Dharmendar Reddy <dharmareddy84 at gmail.com>wrote:

> Hello,
>          Is there a DMPlex based fortran example for solving a pde such as
> laplace ? Even a c example will do. I am not able to understand the
> terminology of chart, cone etc. Is there a paper or user guide to learn
> more about the definitions of terms such as chart cone stratum ? I remember
> reading a presentation file by mathew about sieve. Is there a newer
> tutorial with terminology mapped to the new DMPlex/DMMesh functions.
>

There is a fully worked out Stokes example (SNES ex62) and a Finite Volume
example (TS ex11),
and there are a few tests. You should not need much of that stuff for
defining a problem. I am
writing up a paper about ex11 right now. There is a short manual section on
unstructured grids as well.

I think the key thing to understand is how to define a data layout over the
mesh using a PetscSection.
Once that is done, all the DM functions work as normal, and the last hard
part is coding your residual
loop. I have support for FEM schemes, but its undocumented and slightly
complex in order to allow
GPU assembly, so you may be more comfortable with your own element loop to
start.

  Thanks,

     Matt


> Thanks
> Reddy
>
>
> --
> -----------------------------------------------------
> Dharmendar Reddy Palle
> Graduate Student
> Microelectronics Research center,
> University of Texas at Austin,
> 10100 Burnet Road, Bldg. 160
> MER 2.608F, TX 78758-4445
> e-mail: dharmareddy84 at gmail.com
> Phone: +1-512-350-9082
> United States of America.
> Homepage: https://webspace.utexas.edu/~dpr342
>



-- 
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20130304/226f4d8e/attachment.html>