When can the Elliptic solver be called? During an evolution? Only when
complete coarsest grid steps are complete?
Cheers,
Steve
On 01/21/2014 04:15 AM, Ian Hinder wrote:
On 21 Jan 2014, at 10:02, Roland Haas <[email protected]> wrote:
Hello all, Elo,
Notice that the solver is not in the ET! But I will gladly support
the effort of including it, if needed, as well as answer the
questions of those who simply want to use it.
Uhm, that is indeed correct. The thorn is not in the ET and any user
should consult the documentation in the thorn repository for license and
citation policies. I have added the URL, version information etc to the
"thorns we know of" page on the wiki which lists non-ET, public thorns:
https://docs.einsteintoolkit.org/et-docs/Thorns_we_know_of Please feel
free to amend as needed.
There are two interfaces to the elliptic solver:
1. High-level: Coefficients of the elliptic problem are defined either as
constant parameters in the user's parameter file, or as named grid functions.
This means that you can solve elliptic equations without writing any new code.
This was the original interface, and is the one used in the master branch.
2. Low-level: The RHS of the elliptic equation is provided by a user-written
Cactus function which writes it into grid functions, identified using a
registration mechanism. This makes it more similar to MoL, and more amenable
to automatic code generation for complicated equations. The high-level
interface has been re-implemented in terms of the new interface to avoid code
duplication and to test the new interface. This is only currently available in
the newapi branch, and is still under development and testing and is subject to
change.
I have started writing a small example which uses the low-level interface, but
it has been a low priority, and I haven't worked on it in the last few weeks.
If someone is interested, let me know and I will make it a higher priority.
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