[Getdp] global energy calculation

[Geordie McBain]

2010/10/22 Jens Trommler <trommler at temf.tu-darmstadt.de>:
> Hi,
>
> I'm very new at GetDP and just played with the electro-static example.
> There, it is easily possible to calculate a local quantity like
> electric potential or electric field.
> But how can I postprocess the global energy of the electric field?
> I wasn't able to find that in any of the given examples.

I can't claim to have fully understood it, but I think the plane
capacitance example

  https://geuz.org/trac/getdp/wiki/Capacitor2D

calculates some integral quantities; e.g. the capacitance.  I think
these are boundary integrals rather than domain integrals, but still a
step up from purely local quantities.