DMAddField#

Add a field to a DM object. A field is a function space defined by of a set of discretization points (geometric entities) and a discretization object that defines the function space associated with those points.

Synopsis#

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMAddField(DM dm, DMLabel label, PetscObject disc)

Logically collective on dm

Input Parameters#

  • dm - The DM

  • label - The label indicating the support of the field, or NULL for the entire mesh

  • disc - The discretization object

Notes#

The label already exists or will be added to the DM with DMSetLabel().

For example, a piecewise continous pressure field can be defined by coefficients at the cell centers of a mesh and piecewise constant functions within each cell. Thus a specific function in the space is defined by the combination of a Vec containing the coefficients, a DM defining the geometry entities, a DMLabel indicating a subset of those geometric entities, and a discretization object, such as a PetscFE.

See Also#

DMSetLabel(), DMSetField(), DMGetField(), PetscFE

Level#

intermediate

Location#

src/dm/interface/dm.c

Examples#

src/dm/impls/plex/tutorials/ex8.c.html
src/ts/tutorials/ex11.c.html
src/ts/tutorials/ex52.c.html


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