Actual source code: ex1f90.F90

      1: #include <petsc/finclude/petscdmplex.h>
      2: #include <petsc/finclude/petscdmlabel.h>
      3: program DMPlexTestField
      4:   use petscdm
      5:   use petscdmplex
      6:   implicit none

      8:   DM :: dm
      9:   DMLabel :: label
     10:   Vec :: u
     11:   PetscViewer :: viewer
     12:   PetscSection :: section
     13:   PetscInt, parameter :: numFields = 3, numBC = 1
     14:   PetscInt :: dim, val
     15:   PetscInt, target, dimension(3) ::  numComp
     16:   PetscInt, pointer :: pNumComp(:)
     17:   PetscInt, target, dimension(12) ::  numDof
     18:   PetscInt, pointer :: pNumDof(:)
     19:   PetscInt, target, dimension(1) ::  bcField
     20:   PetscInt, pointer :: pBcField(:)
     21:   PetscMPIInt :: size
     22:   IS, target, dimension(1) ::   bcCompIS
     23:   IS, target, dimension(1) ::   bcPointIS
     24:   IS, pointer :: pBcCompIS(:)
     25:   IS, pointer :: pBcPointIS(:)
     26:   PetscErrorCode :: ierr

     28:   PetscCallA(PetscInitialize(ierr))
     29:   PetscCallMPIA(MPI_Comm_size(PETSC_COMM_WORLD, size, ierr))
     30: ! Create a mesh
     31:   PetscCallA(DMCreate(PETSC_COMM_WORLD, dm, ierr))
     32:   PetscCallA(DMSetType(dm, DMPLEX, ierr))
     33:   PetscCallA(DMSetFromOptions(dm, ierr))
     34:   PetscCallA(DMViewFromOptions(dm, PETSC_NULL_OBJECT, '-dm_view', ierr))
     35:   PetscCallA(DMGetDimension(dm, dim, ierr))
     36: ! Create a scalar field u, a vector field v, and a surface vector field w
     37:   numComp = [1_PETSC_INT_KIND, dim, dim - 1_PETSC_INT_KIND]
     38:   pNumComp => numComp
     39:   numDof(1:numFields*(dim + 1)) = 0
     40: ! Let u be defined on vertices
     41:   numDof(0*(dim + 1) + 1) = 1
     42: ! Let v be defined on cells
     43:   numDof(1*(dim + 1) + dim + 1) = dim
     44: ! Let v be defined on faces
     45:   numDof(2*(dim + 1) + dim) = dim - 1
     46:   pNumDof => numDof
     47: ! Test label retrieval
     48:   PetscCallA(DMGetLabel(dm, 'marker', label, ierr))
     49:   PetscCallA(DMLabelGetValue(label, 0_PETSC_INT_KIND, val, ierr))
     50:   PetscCheckA(size /= 1 .or. val == -1, PETSC_COMM_SELF, PETSC_ERR_PLIB, 'Error in library')
     51:   PetscCallA(DMLabelGetValue(label, 8_PETSC_INT_KIND, val, ierr))
     52:   PetscCheckA(size /= 1 .or. val == 1, PETSC_COMM_SELF, PETSC_ERR_PLIB, 'Error in library')
     53: ! Prescribe a Dirichlet condition on u on the boundary
     54: ! Label "marker" is made by the mesh creation routine
     55:   bcField(1) = 0
     56:   pBcField => bcField
     57:   PetscCallA(ISCreateStride(PETSC_COMM_WORLD, 1_PETSC_INT_KIND, 0_PETSC_INT_KIND, 1_PETSC_INT_KIND, bcCompIS(1), ierr))
     58:   pBcCompIS => bcCompIS
     59:   PetscCallA(DMGetStratumIS(dm, 'marker', 1_PETSC_INT_KIND, bcPointIS(1), ierr))
     60:   pBcPointIS => bcPointIS
     61: ! Create a PetscSection with this data layout
     62:   PetscCallA(DMSetNumFields(dm, numFields, ierr))
     63:   PetscCallA(DMPlexCreateSection(dm, PETSC_NULL_DMLABEL_ARRAY, pNumComp, pNumDof, numBC, pBcField, pBcCompIS, pBcPointIS, PETSC_NULL_IS, section, ierr))
     64:   PetscCallA(ISDestroy(bcCompIS(1), ierr))
     65:   PetscCallA(ISDestroy(bcPointIS(1), ierr))
     66: ! Name the Field variables
     67:   PetscCallA(PetscSectionSetFieldName(section, 0_PETSC_INT_KIND, 'u', ierr))
     68:   PetscCallA(PetscSectionSetFieldName(section, 1_PETSC_INT_KIND, 'v', ierr))
     69:   PetscCallA(PetscSectionSetFieldName(section, 2_PETSC_INT_KIND, 'w', ierr))
     70:   if (size == 1) then
     71:     PetscCallA(PetscSectionView(section, PETSC_VIEWER_STDOUT_WORLD, ierr))
     72:   end if
     73: ! Tell the DM to use this data layout
     74:   PetscCallA(DMSetLocalSection(dm, section, ierr))
     75: ! Create a Vec with this layout and view it
     76:   PetscCallA(DMGetGlobalVector(dm, u, ierr))
     77:   PetscCallA(PetscViewerCreate(PETSC_COMM_WORLD, viewer, ierr))
     78:   PetscCallA(PetscViewerSetType(viewer, PETSCVIEWERVTK, ierr))
     79:   PetscCallA(PetscViewerFileSetName(viewer, 'sol.vtu', ierr))
     80:   PetscCallA(VecView(u, viewer, ierr))
     81:   PetscCallA(PetscViewerDestroy(viewer, ierr))
     82:   PetscCallA(DMRestoreGlobalVector(dm, u, ierr))
     83: ! Cleanup
     84:   PetscCallA(PetscSectionDestroy(section, ierr))
     85:   PetscCallA(DMDestroy(dm, ierr))

     87:   PetscCallA(PetscFinalize(ierr))
     88: end program DMPlexTestField

     90: !/*TEST
     91: !
     92: !  test:
     93: !    suffix: 0
     94: !    requires: triangle
     95: !    args: -info :~sys,mat:
     96: !
     97: !  test:
     98: !    suffix: 0_2
     99: !    requires: triangle
    100: !    nsize: 2
    101: !    args: -info :~sys,mat,partitioner:
    102: !
    103: !  test:
    104: !    suffix: 1
    105: !    requires: ctetgen
    106: !    args: -dm_plex_dim 3 -info :~sys,mat:
    107: !
    108: !TEST*/