1c4762a1bSJed Brown static char help[] = "Define a simple field over the mesh\n\n"; 2c4762a1bSJed Brown 3c4762a1bSJed Brown #include <petscdmplex.h> 4c4762a1bSJed Brown 5c4762a1bSJed Brown int main(int argc, char **argv) 6c4762a1bSJed Brown { 730602db0SMatthew G. Knepley DM dm; 8c4762a1bSJed Brown Vec u; 9c4762a1bSJed Brown PetscSection section; 10c4762a1bSJed Brown PetscViewer viewer; 1130602db0SMatthew G. Knepley PetscInt dim, numFields, numBC, i; 12c4762a1bSJed Brown PetscInt numComp[3]; 13c4762a1bSJed Brown PetscInt numDof[12]; 14c4762a1bSJed Brown PetscInt bcField[1]; 15c4762a1bSJed Brown IS bcPointIS[1]; 16c4762a1bSJed Brown PetscErrorCode ierr; 17c4762a1bSJed Brown 18c4762a1bSJed Brown ierr = PetscInitialize(&argc, &argv, NULL,help);if (ierr) return ierr; 19c4762a1bSJed Brown /* Create a mesh */ 20*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMCreate(PETSC_COMM_WORLD, &dm)); 21*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMSetType(dm, DMPLEX)); 22*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMSetFromOptions(dm)); 23*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMViewFromOptions(dm, NULL, "-dm_view")); 24*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMGetDimension(dm, &dim)); 25c4762a1bSJed Brown /* Create a scalar field u, a vector field v, and a surface vector field w */ 26c4762a1bSJed Brown numFields = 3; 27c4762a1bSJed Brown numComp[0] = 1; 28c4762a1bSJed Brown numComp[1] = dim; 29c4762a1bSJed Brown numComp[2] = dim-1; 30c4762a1bSJed Brown for (i = 0; i < numFields*(dim+1); ++i) numDof[i] = 0; 31c4762a1bSJed Brown /* Let u be defined on vertices */ 32c4762a1bSJed Brown numDof[0*(dim+1)+0] = 1; 33c4762a1bSJed Brown /* Let v be defined on cells */ 34c4762a1bSJed Brown numDof[1*(dim+1)+dim] = dim; 35c4762a1bSJed Brown /* Let w be defined on faces */ 36c4762a1bSJed Brown numDof[2*(dim+1)+dim-1] = dim-1; 37c4762a1bSJed Brown /* Setup boundary conditions */ 38c4762a1bSJed Brown numBC = 1; 39c4762a1bSJed Brown /* Prescribe a Dirichlet condition on u on the boundary 40c4762a1bSJed Brown Label "marker" is made by the mesh creation routine */ 41c4762a1bSJed Brown bcField[0] = 0; 42*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMGetStratumIS(dm, "marker", 1, &bcPointIS[0])); 43c4762a1bSJed Brown /* Create a PetscSection with this data layout */ 44*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMSetNumFields(dm, numFields)); 45*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMPlexCreateSection(dm, NULL, numComp, numDof, numBC, bcField, NULL, bcPointIS, NULL, §ion)); 46*5f80ce2aSJacob Faibussowitsch CHKERRQ(ISDestroy(&bcPointIS[0])); 47c4762a1bSJed Brown /* Name the Field variables */ 48*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscSectionSetFieldName(section, 0, "u")); 49*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscSectionSetFieldName(section, 1, "v")); 50*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscSectionSetFieldName(section, 2, "w")); 51*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscSectionView(section, PETSC_VIEWER_STDOUT_WORLD)); 52c4762a1bSJed Brown /* Tell the DM to use this data layout */ 53*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMSetLocalSection(dm, section)); 54c4762a1bSJed Brown /* Create a Vec with this layout and view it */ 55*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMGetGlobalVector(dm, &u)); 56*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerCreate(PETSC_COMM_WORLD, &viewer)); 57*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerSetType(viewer, PETSCVIEWERVTK)); 58*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerFileSetName(viewer, "sol.vtu")); 59*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecView(u, viewer)); 60*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerDestroy(&viewer)); 61*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMRestoreGlobalVector(dm, &u)); 62c4762a1bSJed Brown /* Cleanup */ 63*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscSectionDestroy(§ion)); 64*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMDestroy(&dm)); 65c4762a1bSJed Brown ierr = PetscFinalize(); 66c4762a1bSJed Brown return ierr; 67c4762a1bSJed Brown } 68c4762a1bSJed Brown 69c4762a1bSJed Brown /*TEST 70c4762a1bSJed Brown 71c4762a1bSJed Brown test: 72c4762a1bSJed Brown suffix: 0 73c4762a1bSJed Brown requires: triangle 7430602db0SMatthew G. Knepley args: -info :~sys,mat 75c4762a1bSJed Brown test: 76c4762a1bSJed Brown suffix: 1 77c4762a1bSJed Brown requires: ctetgen 7830602db0SMatthew G. Knepley args: -dm_plex_dim 3 -info :~sys,mat 79c4762a1bSJed Brown 80c4762a1bSJed Brown TEST*/ 81