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Adding subtype capabilities to foam_io.cc #813

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55 changes: 51 additions & 4 deletions framework/mesh/io/foam_io.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,48 @@ namespace
{
// Utility functions

CellType
SelectCellSubtype(const std::vector<UnpartitionedMesh::LightWeightFace>& faces)
{
const size_t nfaces = faces.size();
size_t ntri = 0;
size_t nquad = 0;

for (const auto& f : faces)
{
const size_t nv = f.vertex_ids.size();
if (nv == 3)
{
++ntri;
}
else if (nv == 4)
{
++nquad;
}
}

CellType subtype = CellType::POLYHEDRON;

if (nfaces == 4 && ntri == 4)
{
subtype = CellType::TETRAHEDRON;
}
if (nfaces == 6 && nquad == 6)
{
subtype = CellType::HEXAHEDRON;
}
if (nfaces == 5 && ntri == 2 && nquad == 3)
{
subtype = CellType::WEDGE;
}
if (nfaces == 5 && ntri == 4 && nquad == 1)
{
subtype = CellType::PYRAMID;
}

return subtype;
}

// Skip whitespace and both // and /* */ comments
inline void
SkipWSAndComments(std::istream& s)
Expand Down Expand Up @@ -652,9 +694,8 @@ MeshIO::FromOpenFOAM(const UnpartitionedMesh::Options& options)
// volume cells (POLYHEDRON)
for (size_t c = 0; c < ncells; ++c)
{
auto cell = std::make_shared<UnpartitionedMesh::LightWeightCell>(CellType::POLYHEDRON,
CellType::POLYHEDRON);
cell->block_id = block_map[c];
std::vector<UnpartitionedMesh::LightWeightFace> tmp_faces;
tmp_faces.reserve(cell_faces[c].size());

for (auto code : cell_faces[c])
{
Expand All @@ -673,9 +714,15 @@ MeshIO::FromOpenFOAM(const UnpartitionedMesh::Options& options)
for (auto it = f_v.rbegin(); it != f_v.rend(); ++it)
lwf.vertex_ids.push_back(static_cast<uint64_t>(*it));
}
cell->faces.push_back(std::move(lwf));
tmp_faces.push_back(std::move(lwf));
}

const CellType subtype = SelectCellSubtype(tmp_faces);

auto cell = std::make_shared<UnpartitionedMesh::LightWeightCell>(CellType::POLYHEDRON, subtype);
cell->block_id = block_map[c];
cell->faces = std::move(tmp_faces);

// per cell vertex ids
std::vector<uint64_t> v_set;
for (const auto& f : cell->faces)
Expand Down