Ok, let me rephrase that...something like way FEniCS (if i remember
correctly) handles this ... between two values with a very small difference
between them on each axis? Is there an example of something like that to
use as a security blanket from which to expand?

Robert

Robert L. Walker
MS Petroleum Engineering
Mork Family Department of Chemicals and Materials Sciences
University of Southern California
----------------------------------------------
Mobile US: +1 (213) - 290 -7101
Mobile EU: +34 62 274 66 40
rlwal...@usc.edu

On Fri, Apr 13, 2018 at 10:46 AM, Matthew Knepley <knep...@gmail.com> wrote:

> On Fri, Apr 13, 2018 at 1:40 PM, Robert Walker <rlwal...@usc.edu> wrote:
>
>> Hello,
>>
>> Is there an example of application of a point source in one of the
>> tutorial  PETScFE style examples? Ideally this would be some point on the
>> interior, and not necessarily on a boundary.
>>
>> Thanks, and apologies in advance if this is a stupid question,
>>
>
> No, good question. You would have to decide what that meant in FEM terms.
> All the internal integrals are done
> with quadrature. So putting the source at a quadrature point would work,
> although its a little difficult to know where
> they will be. You could smooth it out a little, and check coordinates in
> the forcing function. Last, you could check
> for a "close enough" quadrature point and put it there. I think making a
> slightly extended source is usually best.
>
>   Thanks,
>
>      Matt
>
>
>> Robert
>>
>>
>> Robert L. Walker
>> MS Petroleum Engineering
>> Mork Family Department of Chemicals and Materials Sciences
>> University of Southern California
>> ----------------------------------------------
>> Mobile US: +1 (213) - 290 -7101
>> Mobile EU: +34 62 274 66 40
>> rlwal...@usc.edu
>>
>
>
>
> --
> 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/
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