On Fri, Jun 23, 2023 at 10:28 AM neil liu <[email protected]> wrote:
> Dear Petsc developers,
>
> I am learning *PetscDTSimplexQuadrature *and plan to use it.
> I found that, in the biunit simplex (tetra),
> (-1,-1,-1),(1,-1,-1),(-1,1,-1),(-1,-1,1),
> degree 1: npoints 4, the sum of weights = 4/3(the volume of this simplex)
> degree 2 : npoints 8;
> For my previous experience, I used Gauss quadrature rules, (npoints =4 ,
> 5, 11, 15).
> Then I am curious what rule is Petsc using ?
>
There are two supported types:
- Stroud Conical Quadrature
- Minimal Symmetric Quadrature
I think we prefer symmetric when it is available.
> And is *PetscDTSimplexQuadrature *used by PetscFE?
>
Yes.
Thanks,
Matt
>
> Thanks a lot,
>
> Xiaodong
>
>
--
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/>
