/*@
DMPlexTSGetGeometryFVM - Return precomputed geometric data
Input Parameter:
. dm - The DM
Output Parameters:
+ facegeom - The values precomputed from face geometry
. cellgeom - The values precomputed from cell geometry
- minRadius - The minimum radius over the mesh of an inscribed sphere in a cell
Level: developer
.seealso: DMPlexTSSetRHSFunctionLocal()
@*/
PetscErrorCode DMPlexTSGetGeometryFVM(DM dm, Vec *facegeom, Vec *cellgeom, PetscReal *minRadius)
{
DMTS dmts;
PetscObject obj;
PetscErrorCode ierr;
PetscFunctionBegin;
PetscValidHeaderSpecific(dm,DM_CLASSID,1);
ierr = DMGetDMTS(dm, &dmts);CHKERRQ(ierr);
ierr = PetscObjectQuery((PetscObject) dmts, "DMPlexTS_facegeom_fvm", &obj);CHKERRQ(ierr);
if (!obj) {
Vec cellgeom, facegeom;
ierr = DMPlexComputeGeometryFVM(dm, &cellgeom, &facegeom);CHKERRQ(ierr);
ierr = PetscObjectCompose((PetscObject) dmts, "DMPlexTS_facegeom_fvm", (PetscObject) facegeom);CHKERRQ(ierr);
ierr = PetscObjectCompose((PetscObject) dmts, "DMPlexTS_cellgeom_fvm", (PetscObject) cellgeom);CHKERRQ(ierr);
ierr = VecDestroy(&facegeom);CHKERRQ(ierr);
ierr = VecDestroy(&cellgeom);CHKERRQ(ierr);
}
if (facegeom) {PetscValidPointer(facegeom, 2); ierr = PetscObjectQuery((PetscObject) dmts, "DMPlexTS_facegeom_fvm", (PetscObject *) facegeom);CHKERRQ(ierr);}
if (cellgeom) {PetscValidPointer(cellgeom, 3); ierr = PetscObjectQuery((PetscObject) dmts, "DMPlexTS_cellgeom_fvm", (PetscObject *) cellgeom);CHKERRQ(ierr);}
if (minRadius) {ierr = DMPlexGetMinRadius(dm, minRadius);CHKERRQ(ierr);}
PetscFunctionReturn(0);
}
int main(int argc, char *argv[])
{
PetscErrorCode ierr;
DM dm;
PetscBool interpolate = PETSC_TRUE;
PetscInt dim;
PetscInt pStart, pEnd;
PetscInt vStart, vEnd;
PetscInt eStart, eEnd;
PetscInt cStart, cEnd;
PetscSection s;
ierr = PetscInitialize(&argc, &argv, (char*)0, help); CHKERRQ(ierr);
ierr = DMPlexCreateGmshFromFile(MPI_COMM_WORLD, argv[1], interpolate, &dm); CHKERRQ(ierr);
ierr = DMGetDimension(dm, &dim); CHKERRQ(ierr);
printf("dim = %d\n", dim);
ierr = DMPlexGetChart(dm, &pStart, &pEnd); CHKERRQ(ierr);
printf("chart: pstart, pend = %d %d\n", pStart, pEnd);
// vertices
ierr = DMPlexGetDepthStratum(dm, 0, &vStart, &vEnd); CHKERRQ(ierr);
printf("Depth 0: vstart, vend, len = %d %d %d\n", vStart, vEnd, vEnd-vStart);
// edges
ierr = DMPlexGetDepthStratum(dm, 1, &eStart, &eEnd); CHKERRQ(ierr);
printf("Depth 1: estart, eend, len = %d %d %d\n", eStart, eEnd, eEnd-eStart);
// cells
ierr = DMPlexGetDepthStratum(dm, 2, &cStart, &cEnd); CHKERRQ(ierr);
printf("Depth 2: cstart, cend, len = %d %d %d\n", cStart, cEnd, cEnd-cStart);
// cells adjacent to face
{
FILE * fid = fopen("face_nbr.txt","w");
for(PetscInt e=eStart; e<eEnd; ++e)
{
PetscInt nbr;
ierr = DMPlexGetSupportSize(dm, e, &nbr); CHKERRQ(ierr);
const PetscInt *nbcells;
ierr = DMPlexGetSupport(dm, e, &nbcells); CHKERRQ(ierr);
if(nbr == 1) // boundary face
fprintf(fid, "%d %d\n",e-eStart+1,nbcells[0]-cStart+1);
else if(nbr == 2) // interior face
fprintf(fid, "%d %d %d\n",e-eStart+1,nbcells[0]-cStart+1,nbcells[1]-cStart+1);
else
{
printf("nbr is not 1 or 2\n");
exit(0);
}
}
fclose(fid);
}
// point coordinates
{
Vec coordinates;
ierr = DMGetCoordinatesLocal(dm, &coordinates); CHKERRQ(ierr);
const PetscScalar *coords;
ierr = VecGetArrayRead(coordinates, &coords); CHKERRQ(ierr);
DM dmCoord;
ierr = DMGetCoordinateDM(dm, &dmCoord); CHKERRQ(ierr);
FILE * fid = fopen("vertices.txt","w");
for(PetscInt v=vStart; v<vEnd; ++v)
{
PetscScalar *vertex;
ierr = DMPlexPointLocalRead(dmCoord, v, coords, &vertex); CHKERRQ(ierr);
fprintf(fid, "%f %f\n", vertex[0], vertex[1]);
}
fclose(fid);
ierr = VecRestoreArrayRead(coordinates, &coords); CHKERRQ(ierr);
}
// compute cell and face geometry
{
Vec cellgeom, facegeom;
ierr = DMPlexComputeGeometryFVM(dm, &cellgeom, &facegeom); CHKERRQ(ierr);
// cell information
DM dmCell;
ierr = VecGetDM(cellgeom, &dmCell); CHKERRQ(ierr);
const PetscScalar *cgeom;
ierr = VecGetArrayRead(cellgeom, &cgeom); CHKERRQ(ierr);
FILE * fid = fopen("cells.txt","w");
for(PetscInt c=cStart; c<cEnd; ++c)
{
// cell properties like volume, centroid
PetscFVCellGeom *cg;
ierr = DMPlexPointLocalRead(dmCell, c, cgeom, &cg); CHKERRQ(ierr);
fprintf(fid, "%d %f %f %f\n", c-cStart+1, cg->volume,
cg->centroid[0], cg->centroid[1]);
}
fclose(fid);
ierr = VecRestoreArrayRead(cellgeom, &cgeom); CHKERRQ(ierr);
// face information
DM dmFace;
ierr = VecGetDM(facegeom, &dmFace); CHKERRQ(ierr);
const PetscScalar *fgeom;
ierr = VecGetArrayRead(facegeom, &fgeom); CHKERRQ(ierr);
fid = fopen("faces.txt","w");
for(PetscInt e=eStart; e<eEnd; ++e)
{
// face properties like area normal, centroid
PetscFVFaceGeom *fg;
ierr = DMPlexPointLocalRead(dmFace, e, fgeom, &fg); CHKERRQ(ierr);
fprintf(fid, "%d %f %f %f %f\n", e-eStart+1, fg->normal[0], fg->normal[1],
fg->centroid[0], fg->centroid[1]);
}
fclose(fid);
ierr = VecRestoreArrayRead(facegeom, &fgeom); CHKERRQ(ierr);
}
// create section with one variable in each cell
ierr = PetscSectionCreate(PetscObjectComm((PetscObject)dm), &s); CHKERRQ(ierr);
ierr = PetscSectionSetChart(s, pStart, pEnd); CHKERRQ(ierr);
for(PetscInt c=cStart; c<cEnd; ++c)
{
ierr = PetscSectionSetDof(s, c, 1); CHKERRQ(ierr);
}
ierr = PetscSectionSetUp(s); CHKERRQ(ierr);
// create vector to store solution
Vec lv, gv;
ierr = DMSetDefaultSection(dm, s); CHKERRQ(ierr);
ierr = DMGetLocalVector(dm, &lv); CHKERRQ(ierr);
ierr = DMGetGlobalVector(dm, &gv); CHKERRQ(ierr);
}
