Hello everyone! This is deal.II newsletter #265. 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: #15944: Fix some additional warnings (proposed by kronbichler) https://github.com/dealii/dealii/pull/15944 #15943: Make the p::s::T serialization test use zorder. (proposed by drwells) https://github.com/dealii/dealii/pull/15943 #15942: Use more 'if constexpr' in the matrix-free code. (proposed by drwells) https://github.com/dealii/dealii/pull/15942 #15941: FEEvaluation: Add some padding between different data fields (proposed by kronbichler) https://github.com/dealii/dealii/pull/15941 #15940: MatrixFree: Use constexpr when selecting evaluator factory (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15940 #15939: Fix range-based for loop in performance test (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15939 #15938: Fix assert (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15938 #15937: Avoid switches in cuda_tensor_product_kernels.h (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15937 #15936: Use range-based for loop for FEEvaluation's quadrature point loop (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15936 #15935: Remove unnecessary code in a test (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15935 #15934: Only use necessary vector_tools include file (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15934 #15933: Avoid some loops that get never entered (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15933 #15932: Add Functions::RayleighKotheVortex (proposed by peterrum) https://github.com/dealii/dealii/pull/15932 #15930: FEValues: Allow checking for cell similarities in multi-threaded mode (proposed by masterleinad) https://github.com/dealii/dealii/pull/15930 #15929: Fix indentation CI (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15929 #15928: Introduce IndexSet::is_subset_of(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15928 #15927: MGTwoLevelTransferNonNested: simplices with multiple components (proposed by peterrum) https://github.com/dealii/dealii/pull/15927 #15926: Remove unnecessary include file (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15926 #15925: clang-format: Use QualifierAlignment: Left (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15925 #15924: non_nested_multigrid_04 needs Trilinos (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15924 #15923: VectorizedArray for ARM NEON (proposed by bergbauer; merged) https://github.com/dealii/dealii/pull/15923 #15922: Matrix-free Raviart-Thomas: Set symmetry/even-odd in ShapeInfo (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15922 #15920: Add a new feature for 2nd order symmetric tensor split (proposed by taojinllnl) https://github.com/dealii/dealii/pull/15920 #15918: step-75: enable pseudo-3d solution (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/15918 #15917: Use common code for tensor product polynomial evaluation (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15917 #15915: Tensor polynomials: Remove nonsensical comments (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15915 #15914: MappingQ: don't require update_JxW_values or update_normal_vectors (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15914 #15913: Matrix-free ShapeInfo: Simplify initialization of Raviart-Thomas (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15913 #15912: Fix for https://github.com/dealii/dealii/issues/15882 (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15912 #15911: Fix some failing tests (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15911 #15909: Standardize on 'const X' instead of 'X const', part II (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15909 #15908: Standardize on 'const X' instead of 'X const'. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15908 #15907: Disable eliminate_unrefined_islands in create_geometric_coarsening_sequence(). (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/15907 #15906: Add a default constructor to AffineConstraints. (And be more terse about default arguments.) (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15906 #15905: MatrixFree ShapeInfo: Move some code to UnivariateShapeData (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15905 #15904: Revert "PETScWrappers::TimeStepper: fix typo" (proposed by tamiko) https://github.com/dealii/dealii/pull/15904 #15903: Infrastructure: Update bundled clang-format to version 16 (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15903 #15901: GlobalCoarseningFineDoFHandlerView: add assert (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15901 #15900: Always inline a new function to restore performance (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15900 #15899: Expose RemotePointEvaluation parameters in non-nested multigrid (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/15899 #15898: Be terser in specifying default arguments: ComponentMask. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15898 #15897: CellIDTranslator: make Assert to AssertThrow (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15897 #15896: Introduce SmartPointer::get() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15896 #15895: Move the internal FEValuesViews functions into a new file. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/15895 #15892: Non-nested transfer: add assert (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15892 #15891: Restructure tensor-product kernels via 1d interpolants (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15891 #15890: Use a relative tolerance. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15890 #15889: Use if constexpr in some more places. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/15889 #15888: Fix cuda_tensor_product_kernels.h (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15888 #15886: Avoid using deprecated functions in timing_matrix_free_kokkos.cc (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15886 #15885: Fix notebook: use list of Triangulation in merge_triangulations (proposed by Rombur; merged) https://github.com/dealii/dealii/pull/15885 #15884: Enable std::unique_ptr in MGSmootherRelaxation (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15884 #15883: Matrix-free diagonal: Ensure constant loop bounds (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/15883 #15880: PETScWrappers::TimeStepper: fix typo (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15880 #15879: Enable clang-tidy's bugprone-reserved-identifier check (proposed by sebproell) https://github.com/dealii/dealii/pull/15879 #15878: Modernize a test. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15878 #15877: Clear some forgotten fields in Triangulation::clear(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15877 #15876: Use target_link_options for link options (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15876 #15863: Use Kokkos constructs in tensor product kernels when using Kokkos 4.0 or later (proposed by Rombur; merged) https://github.com/dealii/dealii/pull/15863 #15843: FEPointEvaluation/MappingInfo for simplices (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15843 #15842: Add a version of timing_step_37 using MGTransferMF (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15842 #15820: MGTwoLevelTransferNonNested: enable simplex (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15820 #15807: MGTwoLevelTransfer: specialize setup for FCP and p-mg (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15807 ## And this is a list of recently opened or closed discussions: #15931: Regression tester regressed 166861 (opened) https://github.com/dealii/dealii/issues/15931 #15921: Regression tester regressed 40a638 (opened and closed) https://github.com/dealii/dealii/issues/15921 #15919: New long compile times for grid_tools.cc? (opened and closed) https://github.com/dealii/dealii/issues/15919 #15916: Unable to compile deal ii with LAPACK provided by cray-libsci (opened) https://github.com/dealii/dealii/issues/15916 #15910: Regression tester regressed 020660 (opened and closed) https://github.com/dealii/dealii/issues/15910 #15902: requires clauses with DEAL_II_CXX20_REQUIRES macro are barely readable (opened) https://github.com/dealii/dealii/issues/15902 #15894: MatrixFree: Reduce amount of compiled code for Hessians (opened) https://github.com/dealii/dealii/issues/15894 #15893: Regression tester regressed 1472e1 (opened and closed) https://github.com/dealii/dealii/issues/15893 #15887: Regression tester regressed 13fde3 (opened and closed) https://github.com/dealii/dealii/issues/15887 #15882: Regression tester regressed 53c9b4 (opened and closed) https://github.com/dealii/dealii/issues/15882 #15881: [New feature]: spectrum decomposition of a 2nd order symmetric tensor and 4th order projection tensors (opened) https://github.com/dealii/dealii/issues/15881 #15541: `FineDoFHandlerView` encounters cell that is neither locally nor remotely owned (closed) https://github.com/dealii/dealii/issues/15541 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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