On Wed, Sep 5, 2018 at 9:54 AM Smith, Barry F. <[email protected]> wrote:
> > 2 should belong to one of the subdomains, either one is fine. > > Barry > > > > On Sep 5, 2018, at 10:46 AM, Rossi, Simone <[email protected]> wrote: > > > > I’m trying to setup GASM, but I’m probably misunderstanding something. > > > > If I have this mesh > > > > 0 —— 1 —— 2 —— 3 —— 4 > > subdomain 1 | subdomain 2 > > > You may need to make a decision which subdomain ``2" belongs to. Most people just let the shared node go to the lower MPI rank. If so, in this example, ``2" belongs to the subdomain one. iis1 = {0, 1, 2} ois = {0, 1, 2, 3} iis2 = {3, 4} ois2 = {2, 3, 4} You consider seriously to use GASM, I would suggest to partition your problem (using ``hierach") in such a way that multi-rank subdomain is actually connected, otherwise you may end up having a deficient performance. Thanks, Fande, > > I create an interior (no overlap) and an outer (with overlap) IS for > both subdomains. > > > > In my naive understanding > > > > iis1 = {0, 1} > > ois1 = {0, 1, 2} > > > > and > > > > iis2 = {3, 4} > > ois2 = {2, 3, 4} > > > > but then the node at the interface (node 2) does not belong to any > interior IS. Should node 2 belong to both interior IS? Or should it belong > only to one of the domains? > > > > Thanks, > > Simone > > > > > > On Aug 15, 2018, at 22:11, Griffith, Boyce Eugene <[email protected]> > wrote: > > > >> > >> > >>> On Aug 15, 2018, at 10:07 PM, Smith, Barry F. <[email protected]> > 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 < > [email protected]> 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 > >>> > >> > > > >
