Hello everyone! This is deal.II newsletter #262. 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: #15807: MGTwoLevelTransfer: specialize setup for FCP and p-mg (proposed by peterrum) https://github.com/dealii/dealii/pull/15807 #15806: Add NodeVisitor in rtree.h (proposed by fdrmrc) https://github.com/dealii/dealii/pull/15806 #15805: Added gradient() evaluation to VectorFunctionFromTensorFunction (proposed by AbbBallout) https://github.com/dealii/dealii/pull/15805 #15803: NonMatching: Add support for FE_Q_iso_Q1 to MeshClassifier and Discrete(Face)QuadratureGenerator (proposed by bergbauer) https://github.com/dealii/dealii/pull/15803 #15802: Adjust expectations in a GridTools::get_coarse_mesh_description(). (proposed by bangerth) https://github.com/dealii/dealii/pull/15802 #15801: Make GridGenerator::hyper_cube_with_cylindrical_hole<2>() more robust. (proposed by bangerth) https://github.com/dealii/dealii/pull/15801 #15800: AffineConstraints: fix warnings (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15800 #15799: trilinos_sparse_matrix_mmult needs EpetraExt (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15799 #15798: Fix block_vector_vector_assign (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15798 #15797: DataOut::add_mg_data_vector(): copy vector and update ghost values (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15797 #15796: Simplify code using structured bindings. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15796 #15795: Minor addition to the documentation of a GridTools function. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15795 #15794: Use MGTransferGlobalCoarsening also for local smoothing (proposed by peterrum) https://github.com/dealii/dealii/pull/15794 #15793: `MGTransferMF::interpolate_to_mg()`: zero out ghost values (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15793 #15792: Add MGLevelObject::clear() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15792 #15791: Fix timing_step_37.cc (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15791 #15789: Pre-compute what's needed for AffineConstraints::distribute(). (proposed by bangerth) https://github.com/dealii/dealii/pull/15789 #15788: [9.5] Allow compilation with PETSc but without MPI. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15788 #15787: Require PETSc to be configured with MPI support (proposed by masterleinad) https://github.com/dealii/dealii/pull/15787 #15785: PETScWrappers::TimeStepper support resizing while solving (proposed by stefanozampini) https://github.com/dealii/dealii/pull/15785 #15784: Replace MGTransferMG usages in tests/matrix_free (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15784 #15783: More work to replace std::*::type by std::*_t. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15783 #15782: MGLevelGlobalTransfer: remove unused variables (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15782 #15781: Allow compilation with PETSc but without MPI. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15781 #15779: Small modifications to performance/timing_matrix_free_kokkos (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15779 #15777: CudaWrappers::MatrixFree: Only create required host mirrors (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15777 #15776: Use MPILogInitAll in particles/generators_* tests (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15776 #15775: CMake: only use REPEAT for >=3.15 (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15775 #15773: Draft of FECouplingValues. (proposed by luca-heltai) https://github.com/dealii/dealii/pull/15773 #15772: Allow configuring with CMAKE_CXX_STANDARD=23 (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15772 #15771: Add performance test for `CUDAWrapper::MatrixFree` (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15771 #15770: Config.h.in: use PETSc/SLEPc macros to determine PETSc/SLEPc version (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15770 #15769: Update PETScWrappers::NonlinearSolver (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15769 #15768: PETScWrappers: Support with-strict-petscerrorcode configurations (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15768 #15767: tweak PETSc tests (proposed by stefanozampini; merged) https://github.com/dealii/dealii/pull/15767 #15766: [C++17] Prefer std::is_*_v over std::is_*::value. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15766 #15765: [C++17] Prefer std::decay_t over std::decay::type. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15765 #15764: Improve an error message. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15764 #15757: Check for ArborX C++20 bug (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15757 #15756: github: run all github actions on draft PRs as well (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/15756 #15755: Redo the quadrilateral measure function. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/15755 #15754: Remove duplicate indices if ArborX is available (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/15754 #15753: AffineConstraints::merge(): allow mixed numbers (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15753 #15752: MGTransferGlobalCoarsening: initialize with MGConstrainedDoFs (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15752 #15751: Remove unused exception (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15751 #15750: MGTransferMatrixFree: remove unused template argument (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/15750 #15748: Manually fix up some std::is_same<...> places. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15748 #15747: When outputting numbers of tests, align the text. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15747 #15746: [C++17] Prefer std::is_base_of_v over std::is_base_of::value. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15746 #15745: Small markup fixes. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15745 #15744: Add missing changelog entry about the improvement to step-68 (proposed by blaisb; merged) https://github.com/dealii/dealii/pull/15744 #15731: Use "empty()" instead of "size() == 0" (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/15731 #15730: Keep track of constraints we have already determined are finalized. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/15730 ## And this is a list of recently opened or closed discussions: #15790: Regression tester regressed f803f6 (opened and closed) https://github.com/dealii/dealii/issues/15790 #15786: Failed test with p4est (opened) https://github.com/dealii/dealii/issues/15786 #15780: Initial performance analysis of matrix_free_kokkos benchmark (opened) https://github.com/dealii/dealii/issues/15780 #15778: Regression tester regressed 6bb864 (opened and closed) https://github.com/dealii/dealii/issues/15778 #15774: Regression tester regressed 5a4ffd (opened and closed) https://github.com/dealii/dealii/issues/15774 #15763: issue in building deal.ll (opened) https://github.com/dealii/dealii/issues/15763 #15762: Update step-64 (opened) https://github.com/dealii/dealii/issues/15762 #15761: CudaWrapper::MatrixFree crashes if quadrature points are not queried (opened and closed) https://github.com/dealii/dealii/issues/15761 #15760: Unify interface of p::d::SolutionTransfer and SolutionTransfer (opened) https://github.com/dealii/dealii/issues/15760 #15759: CMake error when configuring with `P4EST` (opened and closed) https://github.com/dealii/dealii/issues/15759 #15758: Test slepc/step-36_parallel_02: very rare test failures (opened) https://github.com/dealii/dealii/issues/15758 #15749: Regression tester regressed dd65f9 (opened and closed) https://github.com/dealii/dealii/issues/15749 #15742: Performance regression: various grid and particle operations with p4est-2.8 versus p4est-2.3 (closed) https://github.com/dealii/dealii/issues/15742 #15741: Performance regression: timing-navier_stokes/setup_matrix_free (closed) https://github.com/dealii/dealii/issues/15741 #14608: Wrong numbering of ucd_to_deal in GeometryInfo<3> (closed) https://github.com/dealii/dealii/issues/14608 #8852: Performance tests (closed) https://github.com/dealii/dealii/issues/8852 #5454: Refactor the PETSc matrix/vector classes (closed) https://github.com/dealii/dealii/issues/5454 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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