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: PetscReal *array;
9: PetscInt *pidArray, *cidArray;
10: PetscInt Np, bs;
11: PetscMPIInt rank;
13: PetscFunctionBeginUser;
14: PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)sw), &rank));
15: PetscCall(DMSwarmGetLocalSize(sw, &Np));
16: PetscCall(DMSwarmGetField(sw, DMSwarmPICField_coor, &bs, NULL, (void **)&array));
17: PetscCall(DMSwarmGetField(sw, DMSwarmField_pid, &bs, NULL, (void **)&pidArray));
18: PetscCall(DMSwarmGetField(sw, DMSwarmPICField_cellid, &bs, NULL, (void **)&cidArray));
19: for (PetscInt p = 0; p < Np; ++p) {
20: const PetscReal th = PetscAtan2Real(array[2 * p + 1], array[2 * p]) / PETSC_PI;
21: const PetscReal r = PetscSqrtReal(array[2 * p + 1] * array[2 * p + 1] + array[2 * p] * array[2 * p]);
22: 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]));
23: }
24: PetscCall(DMSwarmRestoreField(sw, DMSwarmPICField_coor, &bs, NULL, (void **)&array));
25: PetscCall(DMSwarmRestoreField(sw, DMSwarmField_pid, &bs, NULL, (void **)&pidArray));
26: PetscCall(DMSwarmRestoreField(sw, DMSwarmPICField_cellid, &bs, NULL, (void **)&pidArray));
27: PetscFunctionReturn(PETSC_SUCCESS);
28: }
30: int main(int argc, char **argv)
31: {
32: DM dm, sw;
33: PetscDataType dtype;
34: PetscReal *coords, r, dr;
35: PetscInt Nx = 4, Ny = 4, Np = 8, bs;
36: PetscMPIInt rank, size;
38: PetscCall(PetscInitialize(&argc, &argv, NULL, help));
39: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
40: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
42: 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));
43: PetscCall(DMSetFromOptions(dm));
44: PetscCall(DMSetUp(dm));
45: PetscCall(DMDASetUniformCoordinates(dm, -1., 1., -1., 1., -1., 1.));
46: PetscCall(DMViewFromOptions(dm, NULL, "-da_view"));
48: PetscCall(DMCreate(PETSC_COMM_WORLD, &sw));
49: PetscCall(PetscObjectSetName((PetscObject)sw, "Particle Grid"));
50: PetscCall(DMSetType(sw, DMSWARM));
51: PetscCall(DMSetDimension(sw, 2));
52: PetscCall(DMSwarmSetType(sw, DMSWARM_PIC));
53: PetscCall(DMSetFromOptions(sw));
54: PetscCall(DMSwarmSetCellDM(sw, dm));
55: PetscCall(DMSwarmInitializeFieldRegister(sw));
56: PetscCall(DMSwarmRegisterPetscDatatypeField(sw, "u", 1, PETSC_SCALAR));
57: PetscCall(DMSwarmFinalizeFieldRegister(sw));
58: PetscCall(DMSwarmSetLocalSizes(sw, Np, 2));
59: PetscCall(DMSwarmGetField(sw, "DMSwarmPIC_coor", &bs, &dtype, (void **)&coords));
60: dr = 1.0 / (size + 1);
61: r = (rank + 1) * dr;
62: for (PetscInt p = 0; p < Np; ++p) {
63: const PetscReal th = (p + 0.5) * 2. * PETSC_PI / Np;
65: coords[p * 2 + 0] = r * PetscCosReal(th);
66: coords[p * 2 + 1] = r * PetscSinReal(th);
67: }
68: PetscCall(DMSwarmRestoreField(sw, "DMSwarmPIC_coor", &bs, &dtype, (void **)&coords));
69: PetscCall(DMViewFromOptions(sw, NULL, "-swarm_view"));
70: PetscCall(DMSwarmPrint(sw));
72: PetscCall(PetscPrintf(PETSC_COMM_WORLD, "\n... calling DMSwarmMigrate ...\n\n"));
73: PetscCall(DMSwarmMigrate(sw, PETSC_TRUE));
74: PetscCall(DMViewFromOptions(sw, NULL, "-swarm_view"));
75: PetscCall(DMSwarmPrint(sw));
77: PetscCall(DMDestroy(&sw));
78: PetscCall(DMDestroy(&dm));
79: PetscCall(PetscFinalize());
80: return 0;
81: }
83: /*TEST
85: # Swarm does not handle complex or quad
86: build:
87: requires: !complex double
89: test:
90: suffix: 0
92: TEST*/