DMCreateDomainDecompositionScatters

Returns scatters to the subdomain vectors from the global vector for subdomains created with DMCreateDomainDecomposition()

Synopsis

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMCreateDomainDecompositionScatters(DM dm, PetscInt n, DM *subdms, VecScatter *iscat[], VecScatter *oscat[], VecScatter *gscat[])

Not Collective

Input Parameters

• dm - the DM object

• n - the number of subdomains

• subdms - the local subdomains

Output Parameters

• iscat - scatter from global vector to nonoverlapping global vector entries on subdomain

• oscat - scatter from global vector to overlapping global vector entries on subdomain

• gscat - scatter from global vector to local vector on subdomain (fills in ghosts)

Note

This is an alternative to the iis and ois arguments in DMCreateDomainDecomposition() that allow for the solution of general nonlinear problems with overlapping subdomain methods. While merely having index sets that enable subsets of the residual equations to be created is fine for linear problems, nonlinear problems require local assembly of solution and residual data.

Developer Note

Can the subdms input be anything or are they exactly the DM obtained from DMCreateDomainDecomposition()?

See Also

DM Basics, DM, DMCreateDomainDecomposition(), DMDestroy(), DMView(), DMCreateInterpolation(), DMCreateColoring(), DMCreateMatrix(), DMCreateMassMatrix(), DMCreateFieldIS()

Level

developer

Location

src/dm/interface/dm.c

Examples

src/dm/tutorials/ex14.c
src/ts/tutorials/ex29.c

Implementations

DMCreateDomainDecompositionScatters_DA() in src/dm/impls/da/dadd.c
DMCreateDomainDecompositionScatters_pforest() in src/dm/impls/forest/p4est/pforest.h
DMCreateDomainDecompositionScatters_Plex() in src/dm/impls/plex/plexdd.c

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