Actual source code: ex1.c
1: static char help[] = "Test point location in DA using DMSwarm\n";
3: #include <petscdmda.h>
4: #include <petscdmswarm.h>
6: PetscErrorCode DMSwarmPrint(DM sw)
7: {
8: DMSwarmCellDM celldm;
9: PetscReal *array;
10: PetscInt *pidArray, *cidArray;
11: PetscInt Np, bs, Nfc;
12: PetscMPIInt rank;
13: const char **coordFields, *cellid;
15: PetscFunctionBeginUser;
16: PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)sw), &rank));
17: PetscCall(DMSwarmGetLocalSize(sw, &Np));
18: PetscCall(DMSwarmGetCellDMActive(sw, &celldm));
19: PetscCall(DMSwarmCellDMGetCellID(celldm, &cellid));
20: PetscCall(DMSwarmCellDMGetCoordinateFields(celldm, &Nfc, &coordFields));
21: PetscCheck(Nfc == 1, PetscObjectComm((PetscObject)sw), PETSC_ERR_SUP, "We only support a single coordinate field right now, not %" PetscInt_FMT, Nfc);
22: PetscCall(DMSwarmGetField(sw, coordFields[0], &bs, NULL, (void **)&array));
23: PetscCall(DMSwarmGetField(sw, DMSwarmField_pid, &bs, NULL, (void **)&pidArray));
24: PetscCall(DMSwarmGetField(sw, cellid, &bs, NULL, (void **)&cidArray));
25: for (PetscInt p = 0; p < Np; ++p) {
26: const PetscReal th = PetscAtan2Real(array[2 * p + 1], array[2 * p]) / PETSC_PI;
27: const PetscReal r = PetscSqrtReal(array[2 * p + 1] * array[2 * p + 1] + array[2 * p] * array[2 * p]);
28: PetscCall(PetscPrintf(PETSC_COMM_SELF, "[%d] p %" PetscInt_FMT " (%+1.4f,%+1.4f) r=%1.2f th=%1.3f*pi cellid=%" PetscInt_FMT "\n", rank, pidArray[p], (double)array[2 * p], (double)array[2 * p + 1], (double)r, (double)th, cidArray[p]));
29: }
30: PetscCall(DMSwarmRestoreField(sw, coordFields[0], &bs, NULL, (void **)&array));
31: PetscCall(DMSwarmRestoreField(sw, DMSwarmField_pid, &bs, NULL, (void **)&pidArray));
32: PetscCall(DMSwarmRestoreField(sw, cellid, &bs, NULL, (void **)&pidArray));
33: PetscFunctionReturn(PETSC_SUCCESS);
34: }
36: int main(int argc, char **argv)
37: {
38: DM dm, sw;
39: PetscDataType dtype;
40: PetscReal *coords, r, dr;
41: PetscInt Nx = 4, Ny = 4, Np = 8, bs;
42: PetscMPIInt rank, size;
44: PetscCall(PetscInitialize(&argc, &argv, NULL, help));
45: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
46: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
48: PetscCall(DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_GHOSTED, DM_BOUNDARY_GHOSTED, DMDA_STENCIL_BOX, Nx, Ny, PETSC_DECIDE, PETSC_DECIDE, 1, 2, NULL, NULL, &dm));
49: PetscCall(DMSetFromOptions(dm));
50: PetscCall(DMSetUp(dm));
51: PetscCall(DMDASetUniformCoordinates(dm, -1., 1., -1., 1., -1., 1.));
52: PetscCall(DMViewFromOptions(dm, NULL, "-da_view"));
54: PetscCall(DMCreate(PETSC_COMM_WORLD, &sw));
55: PetscCall(PetscObjectSetName((PetscObject)sw, "Particle Grid"));
56: PetscCall(DMSetType(sw, DMSWARM));
57: PetscCall(DMSetDimension(sw, 2));
58: PetscCall(DMSwarmSetType(sw, DMSWARM_PIC));
59: PetscCall(DMSetFromOptions(sw));
60: PetscCall(DMSwarmSetCellDM(sw, dm));
61: PetscCall(DMSwarmInitializeFieldRegister(sw));
62: PetscCall(DMSwarmRegisterPetscDatatypeField(sw, "u", 1, PETSC_SCALAR));
63: PetscCall(DMSwarmFinalizeFieldRegister(sw));
64: PetscCall(DMSwarmSetLocalSizes(sw, Np, 2));
65: PetscCall(DMSwarmGetField(sw, "DMSwarmPIC_coor", &bs, &dtype, (void **)&coords));
66: dr = 1.0 / (size + 1);
67: r = (rank + 1) * dr;
68: for (PetscInt p = 0; p < Np; ++p) {
69: const PetscReal th = (p + 0.5) * 2. * PETSC_PI / Np;
71: coords[p * 2 + 0] = r * PetscCosReal(th);
72: coords[p * 2 + 1] = r * PetscSinReal(th);
73: }
74: PetscCall(DMSwarmRestoreField(sw, "DMSwarmPIC_coor", &bs, &dtype, (void **)&coords));
75: PetscCall(DMViewFromOptions(sw, NULL, "-swarm_view"));
76: PetscCall(DMSwarmPrint(sw));
78: PetscCall(PetscPrintf(PETSC_COMM_WORLD, "\n... calling DMSwarmMigrate ...\n\n"));
79: PetscCall(DMSwarmMigrate(sw, PETSC_TRUE));
80: PetscCall(DMViewFromOptions(sw, NULL, "-swarm_view"));
81: PetscCall(DMSwarmPrint(sw));
83: PetscCall(DMDestroy(&sw));
84: PetscCall(DMDestroy(&dm));
85: PetscCall(PetscFinalize());
86: return 0;
87: }
89: /*TEST
91: # Swarm does not handle complex or quad
92: build:
93: requires: !complex double
95: test:
96: suffix: 0
98: TEST*/