Date: 2026-05-01T06:12:09+00:00

Actual source code: slda.c

      1: #include <../src/ts/characteristic/impls/da/slda.h>
      2: #include <petscdmda.h>
      3: #include <petscviewer.h>

      5: static PetscErrorCode CharacteristicView_DA(Characteristic c, PetscViewer viewer)
      6: {
      7:   Characteristic_DA *da = (Characteristic_DA *)c->data;
      8:   PetscBool          isascii, isstring;

     10:   PetscFunctionBegin;
     11:   /* Pull out field names from DM */
     12:   PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERASCII, &isascii));
     13:   PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERSTRING, &isstring));
     14:   if (isascii) {
     15:     PetscCall(PetscViewerASCIIPrintf(viewer, "  DMDA: dummy=%" PetscInt_FMT "\n", da->dummy));
     16:   } else if (isstring) {
     17:     PetscCall(PetscViewerStringSPrintf(viewer, "dummy %" PetscInt_FMT, da->dummy));
     18:   }
     19:   PetscFunctionReturn(PETSC_SUCCESS);
     20: }

     22: static PetscErrorCode CharacteristicDestroy_DA(Characteristic c)
     23: {
     24:   Characteristic_DA *da = (Characteristic_DA *)c->data;

     26:   PetscFunctionBegin;
     27:   PetscCall(PetscFree(da));
     28:   PetscFunctionReturn(PETSC_SUCCESS);
     29: }

     31: static PetscErrorCode CharacteristicSetUp_DA(Characteristic c)
     32: {
     33:   PetscMPIInt  blockLen[2];
     34:   MPI_Aint     indices[2];
     35:   MPI_Datatype oldtypes[2];
     36:   PetscInt     dim, numValues;

     38:   PetscCall(DMDAGetInfo(c->velocityDA, &dim, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL));
     39:   if (c->structured) PetscCall(PetscMPIIntCast(dim, &c->numIds));
     40:   else c->numIds = 3;
     41:   PetscCheck(c->numFieldComp <= MAX_COMPONENTS, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "The maximum number of fields allowed is %d, you have %" PetscInt_FMT ". You can recompile after increasing MAX_COMPONENTS.", MAX_COMPONENTS, c->numFieldComp);
     42:   numValues = 4 + MAX_COMPONENTS;

     44:   /* Create new MPI datatype for communication of characteristic point structs */
     45:   blockLen[0] = 1 + c->numIds;
     46:   indices[0]  = 0;
     47:   oldtypes[0] = MPIU_INT;
     48:   PetscCall(PetscMPIIntCast(numValues, &blockLen[1]));
     49:   indices[1]  = (1 + c->numIds) * sizeof(PetscInt);
     50:   oldtypes[1] = MPIU_SCALAR;
     51:   PetscCallMPI(MPI_Type_create_struct(2, blockLen, indices, oldtypes, &c->itemType));
     52:   PetscCallMPI(MPI_Type_commit(&c->itemType));

     54:   /* Initialize the local queue for char foot values */
     55:   PetscCall(VecGetLocalSize(c->velocity, &c->queueMax));
     56:   PetscCall(PetscMalloc1(c->queueMax, &c->queue));
     57:   c->queueSize = 0;

     59:   /* Allocate communication structures */
     60:   PetscCheck(c->numNeighbors > 0, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONGSTATE, "Invalid number of neighbors %d. Call CharactersiticSetNeighbors() before setup.", c->numNeighbors);
     61:   PetscCall(PetscMalloc1(c->numNeighbors, &c->needCount));
     62:   PetscCall(PetscMalloc1(c->numNeighbors, &c->localOffsets));
     63:   PetscCall(PetscMalloc1(c->numNeighbors, &c->fillCount));
     64:   PetscCall(PetscMalloc1(c->numNeighbors, &c->remoteOffsets));
     65:   PetscCall(PetscMalloc1(c->numNeighbors - 1, &c->request));
     66:   PetscCall(PetscMalloc1(c->numNeighbors - 1, &c->status));
     67:   PetscFunctionReturn(PETSC_SUCCESS);
     68: }

     70: PETSC_EXTERN PetscErrorCode CharacteristicCreate_DA(Characteristic c)
     71: {
     72:   Characteristic_DA *da;

     74:   PetscFunctionBegin;
     75:   PetscCall(PetscNew(&da));
     76:   PetscCall(PetscMemzero(da, sizeof(Characteristic_DA)));
     77:   c->data = (void *)da;

     79:   c->ops->setup   = CharacteristicSetUp_DA;
     80:   c->ops->destroy = CharacteristicDestroy_DA;
     81:   c->ops->view    = CharacteristicView_DA;

     83:   da->dummy = 0;
     84:   PetscFunctionReturn(PETSC_SUCCESS);
     85: }

     87: /*
     88:    Checks for periodicity of a DM and Maps points outside of a domain back onto the domain
     89:    using appropriate periodicity. At the moment assumes only a 2-D DMDA.
     90:  */
     91: PetscErrorCode DMDAMapCoordsToPeriodicDomain(DM da, PetscScalar *x, PetscScalar *y)
     92: {
     93:   DMBoundaryType bx, by;
     94:   PetscInt       dim, gx, gy;

     96:   PetscFunctionBegin;
     97:   PetscCall(DMDAGetInfo(da, &dim, &gx, &gy, NULL, NULL, NULL, NULL, NULL, NULL, &bx, &by, NULL, NULL));

     99:   if (bx == DM_BOUNDARY_PERIODIC) {
    100:     while (*x >= (PetscScalar)gx) *x -= (PetscScalar)gx;
    101:     while (*x < 0.0) *x += (PetscScalar)gx;
    102:   }
    103:   if (by == DM_BOUNDARY_PERIODIC) {
    104:     while (*y >= (PetscScalar)gy) *y -= (PetscScalar)gy;
    105:     while (*y < 0.0) *y += (PetscScalar)gy;
    106:   }
    107:   PetscFunctionReturn(PETSC_SUCCESS);
    108: }