[petsc-users] Laplacian at infinity

[Matthew Knepley]

On Mon, Sep 22, 2014 at 7:36 AM, John Alletto <4bikerboyjohn at gmail.com>
wrote:

> All,
>
> I am try to match some E&M problems with analytical solutions.
> How do I deal with infinity when using a uniform grid ?
>

It depends on your problem. Keep making it bigger and see if you get
convergence.


> How far out do I need to process, do I need to use a particular technique?
>

It depends on what equations you are using (Maxwell, Poisson, etc.) and
what is important (no reflection, etc.)

   Matt


> John
>



-- 
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
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