Hello everyone! This is deal.II newsletter #149. It automatically reports recently merged features and discussions about the deal.II finite element library.
## Below you find a list of recently proposed or merged features: #11541: Use the correct mapping for a finite element. (proposed by bangerth) https://github.com/dealii/dealii/pull/11541 #11539: Use linear Q1 mapping even in places where we know that that may be wrong (proposed by bangerth) https://github.com/dealii/dealii/pull/11539 #11538: Use default constructed linear mapping. (proposed by bangerth) https://github.com/dealii/dealii/pull/11538 #11537: Remove some unnecessary #include files. (proposed by bangerth) https://github.com/dealii/dealii/pull/11537 #11536: Only consider the tests in tests/simplex/ if we actually have simplex support (proposed by bangerth) https://github.com/dealii/dealii/pull/11536 #11534: add step-55 as a simplex test (proposed by tjhei) https://github.com/dealii/dealii/pull/11534 #11532: Convert step-8 to a simplex test (proposed by nmuch) https://github.com/dealii/dealii/pull/11532 #11531: cell bounding box tests for Simplex grids in 2d and 3d (proposed by nicola-giuliani) https://github.com/dealii/dealii/pull/11531 #11530: Implement Simplex::FE_P::compute_2nd_derivative() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/11530 #11528: simplex: vertex_dof_identities for FE_P (proposed by marcfehling) https://github.com/dealii/dealii/pull/11528 #11527: simplex: compare_for_domination (proposed by marcfehling) https://github.com/dealii/dealii/pull/11527 #11526: Simplify code flow. Add a bit of documentation. (proposed by bangerth) https://github.com/dealii/dealii/pull/11526 #11525: Unit test for GridTools::compute_point_locations in simplex meshes (proposed by lwy5515) https://github.com/dealii/dealii/pull/11525 #11524: Simplify a few return statements a bit. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/11524 #11523: Fix indentation mishap. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/11523 #11522: Fix missing 'spacedim' template argument. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/11522 #11520: Introduce ReferenceCell::get_default_linear_mapping() with triangulation argument. Use it. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/11520 #11519: Particles fully distributed/shared triangulation (proposed by blaisb; merged) https://github.com/dealii/dealii/pull/11519 #11518: Mark a test as requiring UMFPACK. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/11518 #11517: Convert step-7 to a simplex test (proposed by sebproell; merged) https://github.com/dealii/dealii/pull/11517 #11516: Add a utility function for Simplex::FE_P's support points. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/11516 #11515: Generalize p::d::SolutionTransfer for p::f::Triangulation (proposed by elauksap) https://github.com/dealii/dealii/pull/11515 #11514: MappingFE::transform_real_to_unit_cell() (proposed by luca-heltai) https://github.com/dealii/dealii/pull/11514 #11513: Improve error message when accessing vector elements in parallel. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/11513 #11512: Break the declaration of the static mapping into a file of its own. (proposed by bangerth) https://github.com/dealii/dealii/pull/11512 #11510: Fix orientation of triangular faces (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/11510 #11509: Add an assert to ReferenceCell::compute_orientation() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/11509 #11507: Bugfix: DoFs constrained to 0 if FE_Nothing is part of FE_System (proposed by marcfehling) https://github.com/dealii/dealii/pull/11507 #11506: ParameterAcceptor::enter/leave_subsection() (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/11506 #11505: Add FE_P_Bubbles (proposed by drwells) https://github.com/dealii/dealii/pull/11505 #11504: Move and rename tensor basis transformations and add documentation (proposed by nmuch) https://github.com/dealii/dealii/pull/11504 #11503: Convert step-31 to a simplex test (proposed by peterrum) https://github.com/dealii/dealii/pull/11503 #11502: Assert type of coarse grid in p:d:T (proposed by mschreter; merged) https://github.com/dealii/dealii/pull/11502 #11501: Enabling mixed meshes in GridIn::read_vkt() and read_msh() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/11501 #11500: Add some comments to VectorTools::interpolate_boundary_values(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/11500 #11499: improve DynamicSparsityPattern usage documentation (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/11499 #11498: Fix typo (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/11498 #11497: [WIP] Add new BVH class (proposed by Rombur) https://github.com/dealii/dealii/pull/11497 #11495: Fix the VTK output in the exodusii test. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/11495 #11494: Fix BoundingBox's Container ctor. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/11494 #11493: Replace deprecated CellId::to_cell(). (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/11493 #11492: Make one variable 'const'. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/11492 #11491: Clean up some in function_lib.cc. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/11491 #11486: Fix bug in DoFHandler::distribute_dofs (proposed by adamqc; merged) https://github.com/dealii/dealii/pull/11486 #11482: Tutorial step-03 with simplex support. (proposed by eliasstudiert; merged) https://github.com/dealii/dealii/pull/11482 #11479: Adjusted settings for default FESeries::Legendre object. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/11479 #11475: Clarify what the picture shows in step-74. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/11475 #11472: Introduce DEAL_II_DEPRECATED_EARLY (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/11472 #11468: Better explain the purpose of the L-singularity function. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/11468 #11341: Rework breakdown condition in BiCGSTAB (proposed by Rombur; merged) https://github.com/dealii/dealii/pull/11341 ## And this is a list of recently opened or closed discussions: #11540: Fix wrong default mapping for non-quad/hex meshes (opened) https://github.com/dealii/dealii/issues/11540 #11535: set_all_manifold_ids does not to work in simplices (opened) https://github.com/dealii/dealii/issues/11535 #11533: AffineConstraints: wrong values after calling distribute using parallel::distributed & hp::DoFHandler (opened) https://github.com/dealii/dealii/issues/11533 #11529: Ubuntu/Debian: Document better how to use the deal.II package (opened) https://github.com/dealii/dealii/issues/11529 #11521: FE_Nothing constraints are weird (opened) https://github.com/dealii/dealii/issues/11521 #11511: subdivided_hyper_rectangle create grids with wrong material_id (opened and closed) https://github.com/dealii/dealii/issues/11511 #11508: Python wrappers for simplex/mixed meshes (opened) https://github.com/dealii/dealii/issues/11508 #11496: VTK hexahedra have negative volumes (opened) https://github.com/dealii/dealii/issues/11496 #11480: Incompatibility between petsc and Trilinos Wrappers for Sparsematix and Vector (MPI) (closed) https://github.com/dealii/dealii/issues/11480 #11466: Missing picture for step-74 (closed) https://github.com/dealii/dealii/issues/11466 #11338: BiCGStab can loop forever (closed) https://github.com/dealii/dealii/issues/11338 #9015: Python bindings for pre-/post-processing (closed) https://github.com/dealii/dealii/issues/9015 A list of all major changes since the last release can be found at https://www.dealii.org/developer/doxygen/deal.II/recent_changes.html. 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