Actual source code: ex2.cxx
1: static char help[] = "Create a box mesh with DMMoab and test defining a tag on the mesh\n\n";
3: #include <petscdmmoab.h>
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;
21: PetscErrorCode ProcessOptions(MPI_Comm comm, AppCtx *options)
22: {
23: PetscBool flg;
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(PetscStrncpy(options->output_file, "ex2.h5m", sizeof(options->output_file)));
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();
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: }
53: PetscCall(PetscLogEventRegister("CreateMesh", DM_CLASSID, &options->createMeshEvent));
54: PetscFunctionReturn(PETSC_SUCCESS);
55: }
57: PetscErrorCode CreateMesh(MPI_Comm comm, AppCtx *user)
58: {
59: PetscInt i;
60: size_t len;
61: PetscMPIInt rank;
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: } else {
71: if (user->debug) {
72: 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,
73: user->nele, user->nele));
74: }
75: PetscCall(DMMoabCreateBoxMesh(comm, user->dim, user->simplex, NULL, user->nele, 1, &user->dm));
76: }
78: if (user->debug) {
79: PetscCall(PetscPrintf(comm, "Setting field names to DM: \n"));
80: for (i = 0; i < user->nfields; i++) PetscCall(PetscPrintf(comm, "\t Field{%" PetscInt_FMT "} = %s.\n", i, user->fieldnames[i]));
81: }
82: PetscCall(DMMoabSetFieldNames(user->dm, user->nfields, (const char **)user->fieldnames));
83: PetscCall(PetscObjectSetName((PetscObject)user->dm, "Structured Mesh"));
84: PetscCall(PetscLogEventEnd(user->createMeshEvent, 0, 0, 0, 0));
85: PetscFunctionReturn(PETSC_SUCCESS);
86: }
88: int main(int argc, char **argv)
89: {
90: AppCtx user; /* user-defined work context */
91: PetscRandom rctx;
92: Vec solution;
93: Mat system;
94: MPI_Comm comm;
95: PetscInt i;
97: PetscFunctionBeginUser;
98: PetscCall(PetscInitialize(&argc, &argv, NULL, help));
99: comm = PETSC_COMM_WORLD;
100: PetscCall(ProcessOptions(comm, &user));
101: PetscCall(CreateMesh(comm, &user));
103: /* set block size */
104: PetscCall(DMMoabSetBlockSize(user.dm, user.interlace ? user.nfields : 1));
105: PetscCall(DMSetMatType(user.dm, MATAIJ));
107: PetscCall(DMSetFromOptions(user.dm));
109: /* SetUp the data structures for DMMOAB */
110: PetscCall(DMSetUp(user.dm));
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));
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));
121: if (user.write_output) {
122: PetscCall(DMMoabSetGlobalFieldVector(user.dm, solution));
123: if (user.debug) PetscCall(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: }
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: }
138: /*TEST
140: build:
141: requires: moab !complex
143: test:
144: args: -debug -fields v1,v2,v3
146: TEST*/