DMStagCreate3d#

Create an object to manage data living on the elements, faces, edges, and vertices of a parallelized regular 3D grid.

Synopsis#

PETSC_EXTERN PetscErrorCode DMStagCreate3d(MPI_Comm comm, DMBoundaryType bndx, DMBoundaryType bndy, DMBoundaryType bndz, PetscInt M, PetscInt N, PetscInt P, PetscInt m, PetscInt n, PetscInt p, PetscInt dof0, PetscInt dof1, PetscInt dof2, PetscInt dof3, DMStagStencilType stencilType, PetscInt stencilWidth, const PetscInt lx[], const PetscInt ly[], const PetscInt lz[], DM *dm)

Collective

Input Parameters#

comm - MPI communicator
bndx,bndy,bndz - boundary type: DM_BOUNDARY_NONE, DM_BOUNDARY_PERIODIC, or DM_BOUNDARY_GHOSTED
M,N,P - global number of elements in x,y,z directions
m,n,p - number of ranks in the x,y,z directions (may be PETSC_DECIDE)
dof0 - number of degrees of freedom per vertex/0-cell
dof1 - number of degrees of freedom per edge/1-cell
dof2 - number of degrees of freedom per face/2-cell
dof3 - number of degrees of freedom per element/3-cell
stencilType - ghost/halo region type: DMSTAG_STENCIL_NONE, DMSTAG_STENCIL_BOX, or DMSTAG_STENCIL_STAR
stencilWidth - width, in elements, of halo/ghost region
lx,ly,lz - arrays of local x,y,z element counts, of length equal to m,n,p, summing to M,N,P

Output Parameter#

dm - the new DMSTAG object

Options Database Keys#

-dm_view - calls DMViewFromOptions() at the conclusion of DMSetUp()
-stag_grid_x - number of elements in the x direction
-stag_grid_y - number of elements in the y direction
-stag_grid_z - number of elements in the z direction
-stag_ranks_x - number of ranks in the x direction
-stag_ranks_y - number of ranks in the y direction
-stag_ranks_z - number of ranks in the z direction
-stag_ghost_stencil_width - width of ghost region, in elements
-stag_boundary_type x <none,ghosted,periodic> - DMBoundaryType value
-stag_boundary_type y <none,ghosted,periodic> - DMBoundaryType value
-stag_boundary_type z <none,ghosted,periodic> - DMBoundaryType value

Notes#

You must call DMSetUp() after this call before using the DM. If you wish to use the options database (see the keys above) to change values in the DMSTAG, you must call DMSetFromOptions() after this function but before DMSetUp().