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(PetscStrcpy(options->output_file,"ex3.h5m")); 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(0); 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) 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,user->nele,user->nele)); 65 PetscCall(DMMoabCreateBoxMesh(comm, user->dim, user->simplex, NULL, user->nele, user->nghost, &user->dm)); 66 } 67 PetscCall(PetscObjectSetName((PetscObject)user->dm, "Coarse Mesh")); 68 PetscCall(PetscLogEventEnd(user->createMeshEvent,0,0,0,0)); 69 PetscFunctionReturn(0); 70 } 71 72 int main(int argc, char **argv) 73 { 74 AppCtx user; /* user-defined work context */ 75 MPI_Comm comm; 76 PetscInt i; 77 Mat R; 78 DM *dmhierarchy; 79 PetscInt *degrees; 80 PetscBool createR; 81 82 PetscFunctionBeginUser; 83 PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 84 comm = PETSC_COMM_WORLD; 85 createR = PETSC_FALSE; 86 87 PetscCall(ProcessOptions(comm, &user)); 88 PetscCall(CreateMesh(comm, &user)); 89 PetscCall(DMSetFromOptions(user.dm)); 90 91 /* SetUp the data structures for DMMOAB */ 92 PetscCall(DMSetUp(user.dm)); 93 94 PetscCall(PetscMalloc(sizeof(DM)*(user.nlevels+1),&dmhierarchy)); 95 for (i=0; i<=user.nlevels; i++) dmhierarchy[i] = NULL; 96 97 // coarsest grid = 0 98 // finest grid = nlevels 99 dmhierarchy[0] = user.dm; 100 PetscObjectReference((PetscObject)user.dm); 101 102 if (user.nlevels) { 103 PetscCall(PetscMalloc1(user.nlevels, °rees)); 104 for (i=0; i < user.nlevels; i++) degrees[i] = user.degree; 105 if (user.debug) PetscCall(PetscPrintf(comm, "Generate the MOAB mesh hierarchy with %" PetscInt_FMT " levels.\n", user.nlevels)); 106 PetscCall(DMMoabGenerateHierarchy(user.dm,user.nlevels,degrees)); 107 108 PetscBool usehierarchy=PETSC_FALSE; 109 if (usehierarchy) PetscCall(DMRefineHierarchy(user.dm,user.nlevels,&dmhierarchy[1])); 110 else { 111 if (user.debug) { 112 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Level %" PetscInt_FMT "\n", 0)); 113 PetscCall(DMView(user.dm, 0)); 114 } 115 for (i=1; i<=user.nlevels; i++) { 116 if (user.debug) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Level %" PetscInt_FMT "\n", i)); 117 PetscCall(DMRefine(dmhierarchy[i-1],MPI_COMM_NULL,&dmhierarchy[i])); 118 if (createR) PetscCall(DMCreateInterpolation(dmhierarchy[i-1],dmhierarchy[i],&R,NULL)); 119 if (user.debug) { 120 PetscCall(DMView(dmhierarchy[i], 0)); 121 if (createR) PetscCall(MatView(R,0)); 122 } 123 /* Solvers could now set operator "R" to the multigrid PC object for level i 124 PCMGSetInterpolation(pc,i,R) 125 */ 126 if (createR) PetscCall(MatDestroy(&R)); 127 } 128 } 129 } 130 131 if (user.write_output) { 132 if (user.debug) PetscCall(PetscPrintf(comm, "Output mesh hierarchy to file: %s.\n",user.output_file)); 133 PetscCall(DMMoabOutput(dmhierarchy[user.nlevels],(const char*)user.output_file,"")); 134 } 135 136 for (i=0; i<=user.nlevels; i++) PetscCall(DMDestroy(&dmhierarchy[i])); 137 PetscCall(PetscFree(degrees)); 138 PetscCall(PetscFree(dmhierarchy)); 139 PetscCall(DMDestroy(&user.dm)); 140 PetscCall(PetscFinalize()); 141 return 0; 142 } 143 144 /*TEST 145 146 build: 147 requires: moab 148 149 test: 150 args: -debug -n 2 -dim 2 -levels 2 -simplex 151 filter: grep -v "DM_0x" 152 153 test: 154 args: -debug -n 2 -dim 3 -levels 2 155 filter: grep -v "DM_0x" 156 suffix: 1_2 157 158 test: 159 args: -debug -n 2 -dim 3 -ghost 1 -levels 2 160 filter: grep -v "DM_0x" 161 nsize: 2 162 suffix: 2_1 163 164 TEST*/ 165