[petsc-users] FIELDSPLIT fields

[Griffith, Boyce Eugene]

> On Aug 15, 2018, at 10:07 PM, Smith, Barry F. <bsmith at mcs.anl.gov> wrote:
> 
> 
>   Yes you can have "overlapping fields" with FIELDSPLIT but I don't think you can use FIELDSPLIT for your case. You seem to have a geometric decomposition into regions. ASM and GASM are intended for such decompositions. Fieldsplit is for multiple fields that each live across the entire domain.

Basically there is one field the lives on the entire domain, and another field that lives only on a subdomain.

Perhaps we could do GASM for the geometric split and FIELDSPLIT within the subdomain with the two fields.

>   Barry
> 
> 
>> On Aug 15, 2018, at 7:42 PM, Griffith, Boyce Eugene <boyceg at email.unc.edu> wrote:
>> 
>> Is it permissible to have overlapping fields in FIELDSPLIT? We are specifically thinking about how to handle DOFs living on the interface between two regions.
>> 
>> Thanks!
>> 
>> — Boyce
>