[Users] Meeting Minutes

[Steven R. Brandt]

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 <roland.haas at physics.gatech.edu> 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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