/*@C
DMPlexCreateExodus - Create a DMPlex mesh from an ExodusII file.
Collective on comm
Input Parameters:
+ comm - The MPI communicator
. filename - The name of the ExodusII file
- interpolate - Create faces and edges in the mesh
Output Parameter:
. dm - The DM object representing the mesh
Level: beginner
.keywords: mesh,ExodusII
.seealso: DMPLEX, DMCreate(), DMPlexCreateExodus()
@*/
PetscErrorCode DMPlexCreateExodusFromFile(MPI_Comm comm, const char filename[], PetscBool interpolate, DM *dm)
{
PetscMPIInt rank;
PetscErrorCode ierr;
#if defined(PETSC_HAVE_EXODUSII)
int CPU_word_size = 0, IO_word_size = 0, exoid = -1;
float version;
#endif
PetscFunctionBegin;
PetscValidCharPointer(filename, 2);
ierr = MPI_Comm_rank(comm, &rank);CHKERRQ(ierr);
#if defined(PETSC_HAVE_EXODUSII)
if (!rank) {
exoid = ex_open(filename, EX_READ, &CPU_word_size, &IO_word_size, &version);
if (exoid <= 0) SETERRQ1(PETSC_COMM_SELF, PETSC_ERR_LIB, "ex_open(\"%s\",...) did not return a valid file ID", filename);
}
ierr = DMPlexCreateExodus(comm, exoid, interpolate, dm);CHKERRQ(ierr);
if (!rank) {ierr = ex_close(exoid);CHKERRQ(ierr);}
#else
SETERRQ(comm, PETSC_ERR_SUP, "This method requires ExodusII support. Reconfigure using --download-exodusii");
#endif
PetscFunctionReturn(0);
}
PetscErrorCode CreateMesh(MPI_Comm comm, PetscInt testNum, AppCtx *user, DM *dm)
{
PetscInt dim = user->dim;
PetscBool cellSimplex = user->cellSimplex;
PetscBool useGenerator = user->useGenerator;
const char *filename = user->filename;
const char *partitioner = "chaco";
size_t len;
PetscMPIInt rank;
PetscErrorCode ierr;
PetscFunctionBegin;
ierr = MPI_Comm_rank(comm, &rank);CHKERRQ(ierr);
ierr = PetscStrlen(filename, &len);CHKERRQ(ierr);
if (len) {
#if defined(PETSC_HAVE_EXODUSII)
int CPU_word_size = 0, IO_word_size = 0, exoid = -1;
float version;
if (!rank) {
exoid = ex_open(filename, EX_READ, &CPU_word_size, &IO_word_size, &version);
if (exoid <= 0) SETERRQ1(PETSC_COMM_SELF, PETSC_ERR_LIB, "ex_open(\"%s\",...) did not return a valid file ID", filename);
}
ierr = DMPlexCreateExodus(comm, exoid, PETSC_FALSE, dm);CHKERRQ(ierr);
if (!rank) {ierr = ex_close(exoid);CHKERRQ(ierr);}
ierr = DMPlexGetDimension(*dm, &dim);CHKERRQ(ierr);
#else
SETERRQ(comm, PETSC_ERR_SUP, "Loading meshes requires ExodusII support. Reconfigure using --download-exodusii");
#endif
} else if (useGenerator) {
if (cellSimplex) {
ierr = DMPlexCreateBoxMesh(comm, dim, PETSC_FALSE, dm);CHKERRQ(ierr);
} else {
ierr = DMPlexCreateHexBoxMesh(comm, dim, PETSC_FALSE, dm);CHKERRQ(ierr);
}
} else {
ierr = DMCreate(comm, dm);CHKERRQ(ierr);
ierr = DMSetType(*dm, DMPLEX);CHKERRQ(ierr);
ierr = DMPlexSetDimension(*dm, dim);CHKERRQ(ierr);
switch (dim) {
case 2:
if (cellSimplex) {
ierr = CreateSimplex_2D(comm, *dm);CHKERRQ(ierr);
} else {
ierr = CreateQuad_2D(comm, testNum, *dm);CHKERRQ(ierr);
}
break;
case 3:
if (cellSimplex) {
ierr = CreateSimplex_3D(comm, *dm);CHKERRQ(ierr);
} else {
ierr = CreateHex_3D(comm, *dm);CHKERRQ(ierr);
}
break;
default:
SETERRQ1(comm, PETSC_ERR_ARG_OUTOFRANGE, "Cannot make meshes for dimension %d", dim);
}
}
{
DM interpolatedMesh = NULL;
ierr = CheckMesh(*dm);CHKERRQ(ierr);
ierr = DMPlexInterpolate(*dm, &interpolatedMesh);CHKERRQ(ierr);
ierr = DMPlexCopyCoordinates(*dm, interpolatedMesh);CHKERRQ(ierr);
ierr = CompareCones(*dm, interpolatedMesh);CHKERRQ(ierr);
ierr = DMDestroy(dm);CHKERRQ(ierr);
*dm = interpolatedMesh;
}
{
DM distributedMesh = NULL;
/* Distribute mesh over processes */
ierr = DMPlexDistribute(*dm, partitioner, 0, &distributedMesh);CHKERRQ(ierr);
if (distributedMesh) {
ierr = DMDestroy(dm);CHKERRQ(ierr);
*dm = distributedMesh;
}
}
ierr = PetscObjectSetName((PetscObject) *dm, "Interpolated Mesh");CHKERRQ(ierr);
ierr = DMSetFromOptions(*dm);CHKERRQ(ierr);
user->dm = *dm;
PetscFunctionReturn(0);
}
