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

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 continuous 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.