# DMPLEX#

“plex” - A DM object that encapsulates an unstructured mesh, or CW Complex, which can be expressed using a Hasse Diagram. In the local representation, Vecs contain all unknowns in the interior and shared boundary. This is specified by a PetscSection object. Ownership in the global representation is determined by ownership of the underlying DMPLEX points. This is specified by another PetscSection object.

## Options Database Keys#

• -dm_refine_pre - Refine mesh before distribution

• -dm_refine_uniform_pre - Choose uniform or generator-based refinement

• -dm_refine_volume_limit_pre - Cell volume limit after pre-refinement using generator

• -dm_distribute - Distribute mesh across processes

• -dm_distribute_overlap - Number of cells to overlap for distribution

• -dm_refine - Refine mesh after distribution

• -dm_plex_hash_location - Use grid hashing for point location

• -dm_plex_hash_box_faces <n,m,p> - The number of divisions in each direction of the grid hash

• -dm_plex_partition_balance - Attempt to evenly divide points on partition boundary between processes

• -dm_plex_remesh_bd - Allow changes to the boundary on remeshing

• -dm_plex_max_projection_height - Maximum mesh point height used to project locally

• -dm_plex_regular_refinement - Use special nested projection algorithm for regular refinement

• -dm_plex_check_all - Perform all shecks below

• -dm_plex_check_symmetry - Check that the adjacency information in the mesh is symmetric

• -dm_plex_check_skeleton - Check that each cell has the correct number of vertices

• -dm_plex_check_faces - Check that the faces of each cell give a vertex order this is consistent with what we expect from the cell type

• -dm_plex_check_geometry - Check that cells have positive volume

• -dm_view :mesh.tex:ascii_latex - View the mesh in LaTeX/TikZ

• -dm_plex_view_scale - Scale the TikZ

• -dm_plex_print_fem - View FEM assembly information, such as element vectors and matrices

DMPlex: Unstructured Grids in PETSc, DM, DMPLEX, DMType, DMPlexCreate(), DMCreate(), DMSetType(), PetscSection

intermediate

## Location#

src/dm/impls/plex/plexcreate.c

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