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 PetscBool simplex; /* Use simplex elements */ 13 PetscBool interlace; 14 char input_file[PETSC_MAX_PATH_LEN]; /* Import mesh from file */ 15 char output_file[PETSC_MAX_PATH_LEN]; /* Output mesh file name */ 16 PetscBool write_output; /* Write output mesh and data to file */ 17 PetscInt nfields; /* Number of fields */ 18 char *fieldnames[PETSC_MAX_PATH_LEN]; /* Name of a defined field on the mesh */ 19 } AppCtx; 20 21 PetscErrorCode ProcessOptions(MPI_Comm comm, AppCtx *options) { 22 PetscBool flg; 23 24 PetscFunctionBegin; 25 options->debug = PETSC_FALSE; 26 options->dim = 2; 27 options->nele = 5; 28 options->nfields = 256; 29 options->simplex = PETSC_FALSE; 30 options->write_output = PETSC_FALSE; 31 options->interlace = PETSC_FALSE; 32 options->input_file[0] = '\0'; 33 PetscCall(PetscStrcpy(options->output_file, "ex2.h5m")); 34 35 PetscOptionsBegin(comm, "", "Meshing Problem Options", "DMMOAB"); 36 PetscCall(PetscOptionsBool("-debug", "Enable debug messages", "ex2.cxx", options->debug, &options->debug, NULL)); 37 PetscCall(PetscOptionsBool("-interlace", "Use interlaced arrangement for the field data", "ex2.cxx", options->interlace, &options->interlace, NULL)); 38 PetscCall(PetscOptionsBool("-simplex", "Create simplices instead of tensor product elements", "ex2.cxx", options->simplex, &options->simplex, NULL)); 39 PetscCall(PetscOptionsRangeInt("-dim", "The topological mesh dimension", "ex2.cxx", options->dim, &options->dim, NULL, 1, 3)); 40 PetscCall(PetscOptionsBoundedInt("-n", "The number of elements in each dimension", "ex2.cxx", options->nele, &options->nele, NULL, 1)); 41 PetscCall(PetscOptionsString("-meshfile", "The input mesh file", "ex2.cxx", options->input_file, options->input_file, sizeof(options->input_file), NULL)); 42 PetscCall(PetscOptionsString("-io", "Write out the mesh and solution that is defined on it (Default H5M format)", "ex2.cxx", options->output_file, options->output_file, sizeof(options->output_file), &options->write_output)); 43 PetscCall(PetscOptionsStringArray("-fields", "The list of names of the field variables", "ex2.cxx", options->fieldnames, &options->nfields, &flg)); 44 PetscOptionsEnd(); 45 46 if (options->debug) PetscCall(PetscPrintf(comm, "Total number of fields: %" PetscInt_FMT ".\n", options->nfields)); 47 if (!flg) { /* if no field names were given by user, assign a default */ 48 options->nfields = 1; 49 PetscCall(PetscStrallocpy("TestEX2Var", &options->fieldnames[0])); 50 } 51 52 PetscCall(PetscLogEventRegister("CreateMesh", DM_CLASSID, &options->createMeshEvent)); 53 PetscFunctionReturn(0); 54 } 55 56 PetscErrorCode CreateMesh(MPI_Comm comm, AppCtx *user) { 57 PetscInt i; 58 size_t len; 59 PetscMPIInt rank; 60 61 PetscFunctionBegin; 62 PetscCall(PetscLogEventBegin(user->createMeshEvent, 0, 0, 0, 0)); 63 PetscCallMPI(MPI_Comm_rank(comm, &rank)); 64 PetscCall(PetscStrlen(user->input_file, &len)); 65 if (len) { 66 if (user->debug) PetscCall(PetscPrintf(comm, "Loading mesh from file: %s and creating a DM object.\n", user->input_file)); 67 PetscCall(DMMoabLoadFromFile(comm, user->dim, 1, user->input_file, "", &user->dm)); 68 } else { 69 if (user->debug) { 70 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, 71 user->nele, user->nele)); 72 } 73 PetscCall(DMMoabCreateBoxMesh(comm, user->dim, user->simplex, NULL, user->nele, 1, &user->dm)); 74 } 75 76 if (user->debug) { 77 PetscPrintf(comm, "Setting field names to DM: \n"); 78 for (i = 0; i < user->nfields; i++) PetscPrintf(comm, "\t Field{%" PetscInt_FMT "} = %s.\n", i, user->fieldnames[i]); 79 } 80 PetscCall(DMMoabSetFieldNames(user->dm, user->nfields, (const char **)user->fieldnames)); 81 PetscCall(PetscObjectSetName((PetscObject)user->dm, "Structured Mesh")); 82 PetscCall(PetscLogEventEnd(user->createMeshEvent, 0, 0, 0, 0)); 83 PetscFunctionReturn(0); 84 } 85 86 int main(int argc, char **argv) { 87 AppCtx user; /* user-defined work context */ 88 PetscRandom rctx; 89 Vec solution; 90 Mat system; 91 MPI_Comm comm; 92 PetscInt i; 93 94 PetscFunctionBeginUser; 95 PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 96 comm = PETSC_COMM_WORLD; 97 PetscCall(ProcessOptions(comm, &user)); 98 PetscCall(CreateMesh(comm, &user)); 99 100 /* set block size */ 101 PetscCall(DMMoabSetBlockSize(user.dm, (user.interlace ? user.nfields : 1))); 102 PetscCall(DMSetMatType(user.dm, MATAIJ)); 103 104 PetscCall(DMSetFromOptions(user.dm)); 105 106 /* SetUp the data structures for DMMOAB */ 107 PetscCall(DMSetUp(user.dm)); 108 109 if (user.debug) PetscCall(PetscPrintf(comm, "Creating a global vector defined on DM and setting random data.\n")); 110 PetscCall(DMCreateGlobalVector(user.dm, &solution)); 111 PetscCall(PetscRandomCreate(comm, &rctx)); 112 PetscCall(VecSetRandom(solution, rctx)); 113 114 /* test if matrix allocation for the prescribed matrix type is done correctly */ 115 if (user.debug) PetscCall(PetscPrintf(comm, "Creating a global matrix defined on DM with the right block structure.\n")); 116 PetscCall(DMCreateMatrix(user.dm, &system)); 117 118 if (user.write_output) { 119 PetscCall(DMMoabSetGlobalFieldVector(user.dm, solution)); 120 if (user.debug) PetscPrintf(comm, "Output mesh and associated field data to file: %s.\n", user.output_file); 121 PetscCall(DMMoabOutput(user.dm, (const char *)user.output_file, "")); 122 } 123 124 if (user.nfields) { 125 for (i = 0; i < user.nfields; i++) PetscCall(PetscFree(user.fieldnames[i])); 126 } 127 PetscCall(PetscRandomDestroy(&rctx)); 128 PetscCall(VecDestroy(&solution)); 129 PetscCall(MatDestroy(&system)); 130 PetscCall(DMDestroy(&user.dm)); 131 PetscCall(PetscFinalize()); 132 return 0; 133 } 134 135 /*TEST 136 137 build: 138 requires: moab 139 140 test: 141 args: -debug -fields v1,v2,v3 142 143 TEST*/ 144