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 { 23 PetscBool flg; 24 25 PetscFunctionBegin; 26 options->debug = PETSC_FALSE; 27 options->dim = 2; 28 options->nele = 5; 29 options->nfields = 256; 30 options->simplex = PETSC_FALSE; 31 options->write_output = PETSC_FALSE; 32 options->interlace = PETSC_FALSE; 33 options->input_file[0] = '\0'; 34 PetscCall(PetscStrcpy(options->output_file,"ex2.h5m")); 35 36 PetscOptionsBegin(comm, "", "Meshing Problem Options", "DMMOAB"); 37 PetscCall(PetscOptionsBool("-debug", "Enable debug messages", "ex2.cxx", options->debug, &options->debug, NULL)); 38 PetscCall(PetscOptionsBool("-interlace", "Use interlaced arrangement for the field data", "ex2.cxx", options->interlace, &options->interlace, NULL)); 39 PetscCall(PetscOptionsBool("-simplex", "Create simplices instead of tensor product elements", "ex2.cxx", options->simplex, &options->simplex, NULL)); 40 PetscCall(PetscOptionsRangeInt("-dim", "The topological mesh dimension", "ex2.cxx", options->dim, &options->dim, NULL,1,3)); 41 PetscCall(PetscOptionsBoundedInt("-n", "The number of elements in each dimension", "ex2.cxx", options->nele, &options->nele, NULL,1)); 42 PetscCall(PetscOptionsString("-meshfile", "The input mesh file", "ex2.cxx", options->input_file, options->input_file, sizeof(options->input_file), NULL)); 43 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)); 44 PetscCall(PetscOptionsStringArray("-fields", "The list of names of the field variables", "ex2.cxx", options->fieldnames,&options->nfields, &flg)); 45 PetscOptionsEnd(); 46 47 if (options->debug) PetscCall(PetscPrintf(comm, "Total number of fields: %" PetscInt_FMT ".\n",options->nfields)); 48 if (!flg) { /* if no field names were given by user, assign a default */ 49 options->nfields = 1; 50 PetscCall(PetscStrallocpy("TestEX2Var",&options->fieldnames[0])); 51 } 52 53 PetscCall(PetscLogEventRegister("CreateMesh", DM_CLASSID, &options->createMeshEvent)); 54 PetscFunctionReturn(0); 55 } 56 57 PetscErrorCode CreateMesh(MPI_Comm comm, AppCtx *user) 58 { 59 PetscInt i; 60 size_t len; 61 PetscMPIInt rank; 62 63 PetscFunctionBegin; 64 PetscCall(PetscLogEventBegin(user->createMeshEvent,0,0,0,0)); 65 PetscCallMPI(MPI_Comm_rank(comm, &rank)); 66 PetscCall(PetscStrlen(user->input_file, &len)); 67 if (len) { 68 if (user->debug) PetscCall(PetscPrintf(comm, "Loading mesh from file: %s and creating a DM object.\n",user->input_file)); 69 PetscCall(DMMoabLoadFromFile(comm, user->dim, 1, user->input_file, "", &user->dm)); 70 } 71 else { 72 if (user->debug) { 73 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)); 74 } 75 PetscCall(DMMoabCreateBoxMesh(comm, user->dim, user->simplex, NULL, user->nele, 1, &user->dm)); 76 } 77 78 if (user->debug) { 79 PetscPrintf(comm, "Setting field names to DM: \n"); 80 for (i=0; i<user->nfields; i++) 81 PetscPrintf(comm, "\t Field{%" PetscInt_FMT "} = %s.\n",i,user->fieldnames[i]); 82 } 83 PetscCall(DMMoabSetFieldNames(user->dm, user->nfields, (const char**)user->fieldnames)); 84 PetscCall(PetscObjectSetName((PetscObject)user->dm, "Structured Mesh")); 85 PetscCall(PetscLogEventEnd(user->createMeshEvent,0,0,0,0)); 86 PetscFunctionReturn(0); 87 } 88 89 int main(int argc, char **argv) 90 { 91 AppCtx user; /* user-defined work context */ 92 PetscRandom rctx; 93 Vec solution; 94 Mat system; 95 MPI_Comm comm; 96 PetscInt i; 97 98 PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 99 comm = PETSC_COMM_WORLD; 100 PetscCall(ProcessOptions(comm, &user)); 101 PetscCall(CreateMesh(comm, &user)); 102 103 /* set block size */ 104 PetscCall(DMMoabSetBlockSize(user.dm, (user.interlace?user.nfields:1))); 105 PetscCall(DMSetMatType(user.dm,MATAIJ)); 106 107 PetscCall(DMSetFromOptions(user.dm)); 108 109 /* SetUp the data structures for DMMOAB */ 110 PetscCall(DMSetUp(user.dm)); 111 112 if (user.debug) PetscCall(PetscPrintf(comm, "Creating a global vector defined on DM and setting random data.\n")); 113 PetscCall(DMCreateGlobalVector(user.dm,&solution)); 114 PetscCall(PetscRandomCreate(comm,&rctx)); 115 PetscCall(VecSetRandom(solution,rctx)); 116 117 /* test if matrix allocation for the prescribed matrix type is done correctly */ 118 if (user.debug) PetscCall(PetscPrintf(comm, "Creating a global matrix defined on DM with the right block structure.\n")); 119 PetscCall(DMCreateMatrix(user.dm,&system)); 120 121 if (user.write_output) { 122 PetscCall(DMMoabSetGlobalFieldVector(user.dm, solution)); 123 if (user.debug) PetscPrintf(comm, "Output mesh and associated field data to file: %s.\n",user.output_file); 124 PetscCall(DMMoabOutput(user.dm,(const char*)user.output_file,"")); 125 } 126 127 if (user.nfields) { 128 for (i=0; i<user.nfields; i++) PetscCall(PetscFree(user.fieldnames[i])); 129 } 130 PetscCall(PetscRandomDestroy(&rctx)); 131 PetscCall(VecDestroy(&solution)); 132 PetscCall(MatDestroy(&system)); 133 PetscCall(DMDestroy(&user.dm)); 134 PetscCall(PetscFinalize()); 135 return 0; 136 } 137 138 /*TEST 139 140 build: 141 requires: moab 142 143 test: 144 args: -debug -fields v1,v2,v3 145 146 TEST*/ 147