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MFEM v4.7.0
Finite element discretization library
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MFEM v4.7.0
Finite element discretization library
|
Class containing a minimal description of a part (a subset of the elements) of a Mesh and its connectivity to other parts. More...
#include <mesh.hpp>
Classes | |
| struct | Entity |
| struct | EntityHelper |
Public Member Functions | |
| void | Print (std::ostream &os) const |
| Write the MeshPart to a stream using the parallel format "MFEM mesh v1.2". | |
| Mesh & | GetMesh () |
| Construct a serial Mesh object from the MeshPart. | |
Public Attributes | |
| int | dimension |
| Reference space dimension of the elements. | |
| int | space_dimension |
| Dimension of the physical space into which the MeshPart is embedded. | |
| int | num_vertices |
| Number of vertices. | |
| int | num_elements |
| Number of elements with reference space dimension equal to 'dimension'. | |
| int | num_bdr_elements |
| Number of boundary elements with reference space dimension equal to 'dimension'-1. | |
| Array< int > | entity_to_vertex [Geometry::NumGeom] |
| Array< int > | tet_refine_flags |
| Store the refinement flags for tetraheral elements. If all tets have zero refinement flags then this array is empty, i.e. has size 0. | |
| Array< int > | element_map |
| Array< int > | boundary_map |
| Optional re-ordering for the boundary elements, similar to 'element_map'. | |
| Array< int > | attributes |
| Array< int > | bdr_attributes |
| Array< real_t > | vertex_coordinates |
| std::unique_ptr< Mesh > | mesh |
| std::unique_ptr< FiniteElementSpace > | nodal_fes |
| std::unique_ptr< GridFunction > | nodes |
Connectivity to other MeshPart objects | |
| int | num_parts |
| Total number of MeshParts. | |
| int | my_part_id |
| Index of the part described by this MeshPart: 0 <= 'my_part_id' < 'num_parts'. | |
| Table | my_groups |
| Table | group_shared_entity_to_vertex [Geometry::NumGeom] |
Class containing a minimal description of a part (a subset of the elements) of a Mesh and its connectivity to other parts.
The main purpose of this class is to facilitate the partitioning of serial meshes (in serial, i.e. on one processor) and save the parts in parallel MFEM mesh format.
Another potential futrure purpose of this class could be to facilitate exchange of MeshParts between MPI ranks for repartitioning purposes. It can also potentially be used to implement parallel mesh I/O functions with partitionings that have number of parts different from the number of MPI tasks.
| Mesh & mfem::MeshPart::GetMesh | ( | ) |
Construct a serial Mesh object from the MeshPart.
The nodes of 'mesh' are NOT initialized by this method, however, the nodal FE space and nodal GridFunction can be created and then attached to the 'mesh'. The Mesh is constructed only if 'mesh' is empty, otherwise the method simply returns the object held by 'mesh'.
| void mfem::MeshPart::Print | ( | std::ostream & | os | ) | const |
| Array<int> mfem::MeshPart::attributes |
| Array<int> mfem::MeshPart::bdr_attributes |
| Array<int> mfem::MeshPart::boundary_map |
| int mfem::MeshPart::dimension |
| Array<int> mfem::MeshPart::element_map |
Terminology: "by-type" element/boundary ordering: ordered by Geometry::Type and within each Geometry::Type 'geom' ordered as in 'entity_to_vertex[geom]'.
Optional re-ordering of the elements that will be used by (Par)Mesh objects constructed from this MeshPart. This array maps "natural" element ids (used by the Mesh/ParMesh objects) to "by-type" element ids (see above):
"by-type" element id = element_map["natural" element id]
The size of the array is either 'num_elements' or 0 when no re-ordering is needed (then "by-type" id == "natural" id).
| Array<int> mfem::MeshPart::entity_to_vertex[Geometry::NumGeom] |
Each 'entity_to_vertex[geom]' describes the entities of Geometry::Type 'geom' in terms of their vertices. The number of entities of type 'geom' is:
num_entities[geom] = size('entity_to_vertex[geom]')/num_vertices[geom]
The number of all elements, 'num_elements', is:
'num_elements' = sum_{dim[geom]=='dimension'} num_entities[geom]
and the number of all boundary elements, 'num_bdr_elements' is:
'num_bdr_elements' = sum_{dim[geom]=='dimension'-1} num_entities[geom]
Note that 'entity_to_vertex' does NOT describe all "faces" in the mesh part (i.e. all 'dimension'-1 entities) but only the boundary elements. Also, note that lower dimesional entities ('dimension'-2 and lower) are NOT described by the respective array, i.e. the array will be empty.
| Table mfem::MeshPart::group_shared_entity_to_vertex[Geometry::NumGeom] |
Shared entities for this MeshPart are mesh entities of all dimensions less than 'dimension' that are generated by the elements of this MeshPart and at least one other MeshPart.
The Table 'group_shared_entity_to_vertex[geom]' defines, for each group, the shared entities of Geometry::Type 'geom'. Each row (corresponding to a "neighbor" group, as defined by 'my_groups') in the Table defines the shared entities in a way similar to the arrays 'entity_to_vertex[geom]'. The "local" group (with index 0) does not have any shared entities, so the 0-th row in the Table is always empty.
IMPORTANT: the descriptions of the groups in this MeshPart must match their descriptions in all neighboring MeshParts. This includes the ordering of the shared entities within the group, as well as the vertex ordering of each shared entity.
| std::unique_ptr<Mesh> mfem::MeshPart::mesh |
| Table mfem::MeshPart::my_groups |
A group G is a subset of the set { 0, 1, ..., 'num_parts'-1 } for which there is a mesh entity E (of any dimension) in the global mesh such that G is the set of the parts assigned (by the partitioning array) to the elements adjacent to E. The MeshPart describes only the "neighbor" groups, i.e. the groups that contain 'my_part_id'. The Table 'my_groups' defines the "neighbor" groups in terms of their part ids. In other words, it maps "neighbor" group ids to a (sorted) list of part ids. In particular, the number of "neighbor" groups is given by 'my_groups.Size()'. The "local" group { 'my_part_id' } has index 0 in 'my_groups'.
| int mfem::MeshPart::my_part_id |
| std::unique_ptr<FiniteElementSpace> mfem::MeshPart::nodal_fes |
Nodal FE space defined on 'mesh' used by the GridFunction 'nodes'. Uses the FE collection from the global nodal FE space.
| std::unique_ptr<GridFunction> mfem::MeshPart::nodes |
'nodes': pointer to a GridFunction describing the physical location of the MeshPart. Used for describing high-order and periodic meshes. This GridFunction is defined on the FE space 'nodal_fes' which, in turn, is defined on the Mesh 'mesh'.
| int mfem::MeshPart::num_bdr_elements |
| int mfem::MeshPart::num_elements |
| int mfem::MeshPart::space_dimension |
| Array<int> mfem::MeshPart::tet_refine_flags |
Optional vertex coordinates. The size of the array is either
size = 'space_dimension' * 'num_vertices'
or 0 when the vertex coordinates are not used, i.e. when the MeshPart uses a nodal GridFunction to describe its location in physical space. This array uses Ordering::byVDIM: "X0,Y0,Z0, X1,Y1,Z1, ...".
1.11.0