petsc-3.14.6 2021-03-30
DMCreateDomainDecompositionScatters
Returns scatters to the subdomain vectors from the global vector
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 subdomain scatters
|
| subdms | - the local subdomains
|
Output Parameters
| n | - the number of scatters returned
|
| 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)
|
Notes
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.
See Also
DMDestroy(), DMView(), DMCreateInterpolation(), DMCreateColoring(), DMCreateMatrix(), DMCreateFieldIS()
Level
developer
Location
src/dm/interface/dm.c
Implementations
DMCreateDomainDecompositionScatters_DA in src/dm/impls/da/dadd.c
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages