1 static char help[] = "Create a box mesh with DMMoab and test defining a tag on the mesh\n\n"; 2 3 #include <petscdmmoab.h> 4 5 typedef struct { 6 DM dm; /* DM implementation using the MOAB interface */ 7 PetscBool debug; /* The debugging level */ 8 PetscLogEvent createMeshEvent; 9 /* Domain and mesh definition */ 10 PetscInt dim; /* The topological mesh dimension */ 11 PetscInt nele; /* Elements in each dimension */ 12 PetscInt degree; /* Degree of refinement */ 13 PetscBool simplex; /* Use simplex elements */ 14 PetscInt nlevels; /* Number of levels in mesh hierarchy */ 15 PetscInt nghost; /* Number of ghost layers in the mesh */ 16 char input_file[PETSC_MAX_PATH_LEN]; /* Import mesh from file */ 17 char output_file[PETSC_MAX_PATH_LEN]; /* Output mesh file name */ 18 PetscBool write_output; /* Write output mesh and data to file */ 19 } AppCtx; 20 21 PetscErrorCode ProcessOptions(MPI_Comm comm, AppCtx *options) 22 { 23 PetscFunctionBegin; 24 options->debug = PETSC_FALSE; 25 options->nlevels = 1; 26 options->nghost = 1; 27 options->dim = 2; 28 options->nele = 5; 29 options->degree = 2; 30 options->simplex = PETSC_FALSE; 31 options->write_output = PETSC_FALSE; 32 options->input_file[0] = '\0'; 33 PetscCall(PetscStrncpy(options->output_file, "ex3.h5m", sizeof(options->output_file))); 34 35 PetscOptionsBegin(comm, "", "Uniform Mesh Refinement Options", "DMMOAB"); 36 PetscCall(PetscOptionsBool("-debug", "Enable debug messages", "ex2.cxx", options->debug, &options->debug, NULL)); 37 PetscCall(PetscOptionsRangeInt("-dim", "The topological mesh dimension", "ex3.cxx", options->dim, &options->dim, NULL, 0, 3)); 38 PetscCall(PetscOptionsBoundedInt("-n", "The number of elements in each dimension", "ex3.cxx", options->nele, &options->nele, NULL, 1)); 39 PetscCall(PetscOptionsBoundedInt("-levels", "Number of levels in the hierarchy", "ex3.cxx", options->nlevels, &options->nlevels, NULL, 0)); 40 PetscCall(PetscOptionsBoundedInt("-degree", "Number of degrees at each level of refinement", "ex3.cxx", options->degree, &options->degree, NULL, 0)); 41 PetscCall(PetscOptionsBoundedInt("-ghost", "Number of ghost layers in the mesh", "ex3.cxx", options->nghost, &options->nghost, NULL, 0)); 42 PetscCall(PetscOptionsBool("-simplex", "Create simplices instead of tensor product elements", "ex3.cxx", options->simplex, &options->simplex, NULL)); 43 PetscCall(PetscOptionsString("-input", "The input mesh file", "ex3.cxx", options->input_file, options->input_file, sizeof(options->input_file), NULL)); 44 PetscCall(PetscOptionsString("-io", "Write out the mesh and solution that is defined on it (Default H5M format)", "ex3.cxx", options->output_file, options->output_file, sizeof(options->output_file), &options->write_output)); 45 PetscOptionsEnd(); 46 47 PetscCall(PetscLogEventRegister("CreateMesh", DM_CLASSID, &options->createMeshEvent)); 48 PetscFunctionReturn(PETSC_SUCCESS); 49 } 50 51 PetscErrorCode CreateMesh(MPI_Comm comm, AppCtx *user) 52 { 53 size_t len; 54 PetscMPIInt rank; 55 56 PetscFunctionBegin; 57 PetscCall(PetscLogEventBegin(user->createMeshEvent, 0, 0, 0, 0)); 58 PetscCallMPI(MPI_Comm_rank(comm, &rank)); 59 PetscCall(PetscStrlen(user->input_file, &len)); 60 if (len) { 61 if (user->debug) PetscCall(PetscPrintf(comm, "Loading mesh from file: %s and creating the coarse level DM object.\n", user->input_file)); 62 PetscCall(DMMoabLoadFromFile(comm, user->dim, user->nghost, user->input_file, "", &user->dm)); 63 } else { 64 if (user->debug) 65 PetscCall(PetscPrintf(comm, "Creating a %" PetscInt_FMT "-dimensional structured %s mesh of %" PetscInt_FMT "x%" PetscInt_FMT "x%" PetscInt_FMT " in memory and creating a DM object.\n", user->dim, (user->simplex ? "simplex" : "regular"), user->nele, 66 user->nele, user->nele)); 67 PetscCall(DMMoabCreateBoxMesh(comm, user->dim, user->simplex, NULL, user->nele, user->nghost, &user->dm)); 68 } 69 PetscCall(PetscObjectSetName((PetscObject)user->dm, "Coarse Mesh")); 70 PetscCall(PetscLogEventEnd(user->createMeshEvent, 0, 0, 0, 0)); 71 PetscFunctionReturn(PETSC_SUCCESS); 72 } 73 74 int main(int argc, char **argv) 75 { 76 AppCtx user; /* user-defined work context */ 77 MPI_Comm comm; 78 PetscInt i; 79 Mat R; 80 DM *dmhierarchy; 81 PetscInt *degrees; 82 PetscBool createR; 83 84 PetscFunctionBeginUser; 85 PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 86 comm = PETSC_COMM_WORLD; 87 createR = PETSC_FALSE; 88 89 PetscCall(ProcessOptions(comm, &user)); 90 PetscCall(CreateMesh(comm, &user)); 91 PetscCall(DMSetFromOptions(user.dm)); 92 93 /* SetUp the data structures for DMMOAB */ 94 PetscCall(DMSetUp(user.dm)); 95 96 PetscCall(PetscMalloc(sizeof(DM) * (user.nlevels + 1), &dmhierarchy)); 97 for (i = 0; i <= user.nlevels; i++) dmhierarchy[i] = NULL; 98 99 // coarsest grid = 0 100 // finest grid = nlevels 101 dmhierarchy[0] = user.dm; 102 PetscCall(PetscObjectReference((PetscObject)user.dm)); 103 104 if (user.nlevels) { 105 PetscCall(PetscMalloc1(user.nlevels, °rees)); 106 for (i = 0; i < user.nlevels; i++) degrees[i] = user.degree; 107 if (user.debug) PetscCall(PetscPrintf(comm, "Generate the MOAB mesh hierarchy with %" PetscInt_FMT " levels.\n", user.nlevels)); 108 PetscCall(DMMoabGenerateHierarchy(user.dm, user.nlevels, degrees)); 109 110 PetscBool usehierarchy = PETSC_FALSE; 111 if (usehierarchy) PetscCall(DMRefineHierarchy(user.dm, user.nlevels, &dmhierarchy[1])); 112 else { 113 if (user.debug) { 114 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Level %" PetscInt_FMT "\n", 0)); 115 PetscCall(DMView(user.dm, 0)); 116 } 117 for (i = 1; i <= user.nlevels; i++) { 118 if (user.debug) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Level %" PetscInt_FMT "\n", i)); 119 PetscCall(DMRefine(dmhierarchy[i - 1], MPI_COMM_NULL, &dmhierarchy[i])); 120 if (createR) PetscCall(DMCreateInterpolation(dmhierarchy[i - 1], dmhierarchy[i], &R, NULL)); 121 if (user.debug) { 122 PetscCall(DMView(dmhierarchy[i], 0)); 123 if (createR) PetscCall(MatView(R, 0)); 124 } 125 /* Solvers could now set operator "R" to the multigrid PC object for level i 126 PCMGSetInterpolation(pc,i,R) 127 */ 128 if (createR) PetscCall(MatDestroy(&R)); 129 } 130 } 131 } 132 133 if (user.write_output) { 134 if (user.debug) PetscCall(PetscPrintf(comm, "Output mesh hierarchy to file: %s.\n", user.output_file)); 135 PetscCall(DMMoabOutput(dmhierarchy[user.nlevels], (const char *)user.output_file, "")); 136 } 137 138 for (i = 0; i <= user.nlevels; i++) PetscCall(DMDestroy(&dmhierarchy[i])); 139 PetscCall(PetscFree(degrees)); 140 PetscCall(PetscFree(dmhierarchy)); 141 PetscCall(DMDestroy(&user.dm)); 142 PetscCall(PetscFinalize()); 143 return 0; 144 } 145 146 /*TEST 147 148 build: 149 requires: moab !complex 150 151 test: 152 args: -debug -n 2 -dim 2 -levels 2 -simplex 153 filter: grep -v "DM_0x" 154 155 test: 156 args: -debug -n 2 -dim 3 -levels 2 157 filter: grep -v "DM_0x" 158 suffix: 1_2 159 160 test: 161 args: -debug -n 2 -dim 3 -ghost 1 -levels 2 162 filter: grep -v "DM_0x" 163 nsize: 2 164 suffix: 2_1 165 166 TEST*/ 167