Hello everyone! This is deal.II newsletter #195. 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: #13161: Extend ScratchData's public interface with getter methods to access private data (proposed by jppelteret; merged) https://github.com/dealii/dealii/pull/13161 #13160: step-74: add DOI (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/13160 #13159: Extend PreconditionRelaxation (proposed by peterrum) https://github.com/dealii/dealii/pull/13159 #13158: Add get_embedding_dofs() to FE_Nedelec (2-D) (proposed by harmonj) https://github.com/dealii/dealii/pull/13158 #13157: Avoid a temp array in the UMFPACK interfaces. (proposed by bangerth) https://github.com/dealii/dealii/pull/13157 #13156: Also simplify parallel::accumulate_from_subranges() with lambdas. (proposed by bangerth) https://github.com/dealii/dealii/pull/13156 #13155: Parallelize some functions setting up UMFPACK. (proposed by bangerth) https://github.com/dealii/dealii/pull/13155 #13154: Iterator filter predicates for boundary and manifold IDs (proposed by jppelteret; merged) https://github.com/dealii/dealii/pull/13154 #13153: Simplify more code in parallel.h via lambda functions. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13153 #13152: Refactor PreconditionRelaxation (proposed by peterrum) https://github.com/dealii/dealii/pull/13152 #13151: Simplify code by using lambda functions. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13151 #13150: Avoid implicit bool conversions (proposed by masterleinad) https://github.com/dealii/dealii/pull/13150 #13149: [WIP] Add Kokkos backend in LinearAlgebra::distributed::Vector (proposed by Rombur) https://github.com/dealii/dealii/pull/13149 #13147: Add a bit of documentation to MPI::compute_point_to_point_communication_pattern() (proposed by bangerth) https://github.com/dealii/dealii/pull/13147 #13146: Fix compilation with 64-bit integers (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/13146 #13145: typo in docu of fourth order unit tensor (SymmetricTensor<4, dim, Number> identity_tensor()) (proposed by jfriedlein; merged) https://github.com/dealii/dealii/pull/13145 #13144: Fix omissions in GridGenerator::flatten_triangulation(). (proposed by bangerth) https://github.com/dealii/dealii/pull/13144 #13143: Bug in gmsh api writer. (proposed by luca-heltai) https://github.com/dealii/dealii/pull/13143 #13142: Add a bunch of dummy functions for TriaAccessor<0,1,spacedim>. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13142 #13141: Add assertions and a test (proposed by bangerth) https://github.com/dealii/dealii/pull/13141 #13140: Make sure HOME, WORKDIR, and MPI env vars are set correctly. (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/13140 #13139: Small cleanup in SD::BatchOptimizer (proposed by jppelteret; merged) https://github.com/dealii/dealii/pull/13139 #13138: github-actions: cache Intel workflow (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/13138 #13137: fix docker.yml - try 3 (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/13137 #13136: Add a hash to SymEngine expression wrapper (proposed by jppelteret) https://github.com/dealii/dealii/pull/13136 #13135: Add SD::BatchOptimizer::copy_from() function (proposed by jppelteret; merged) https://github.com/dealii/dealii/pull/13135 #13134: Fix a bug in SD::BatchOptimizer::extract() (proposed by jppelteret; merged) https://github.com/dealii/dealii/pull/13134 #13133: SD::BatchOptimizer: Corrected location for a set of assertions. (proposed by jppelteret; merged) https://github.com/dealii/dealii/pull/13133 #13132: Add an assertion to GridGenerator::flatten_triangulation(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13132 #13130: Update documentation of GridGenerator::flatten_triangulation(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13130 #13129: CMake: use portable "rm" in quick_tests (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/13129 #13128: More minor changes to GridGenerator::flatten_triangulation(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13128 #13125: fix docker.yml - try 2. (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/13125 #13124: Manifold for `pipe_junction`. (proposed by marcfehling) https://github.com/dealii/dealii/pull/13124 #13123: [9.3] sundials fix (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/13123 #13121: Calculate cross product once. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/13121 #13120: Add docker image with root user. (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/13120 #13119: Minor doc update in the cmake system. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13119 #13118: Separate 2d povray output from the general case. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13118 #13117: Minor rework of the GridGenerator::flatten_triangulation() function. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13117 #13116: Deprecate the new_thread() functions. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13116 #13115: MatrixFree: fix size of vector (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13115 #13112: Add a necessary include file. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13112 #13111: Link from step-47 to step-82. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13111 #13109: Simplify initialization of block objects in the tutorial. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13109 #13108: Omit unnecessary template argument. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13108 #13107: Make sure doxygen does not format all combinations of NonMatching::coupling_*. (proposed by luca-heltai; merged) https://github.com/dealii/dealii/pull/13107 #13105: Allow inhomogeneous Dirichlet in Step-60 (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/13105 #13102: Correct typo (math rendering) (proposed by mwichro; merged) https://github.com/dealii/dealii/pull/13102 #13101: Bug fix of MF face eval for hanging nodes and non-standard orientation (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/13101 #13099: Global coarsening: compress weights (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13099 #13097: Util::MPI::compute_n_point_to_point_communications() add fallback (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/13097 #13095: Fixed bug in SparseDirectUMFPACK #12916 (proposed by kuljitvirk; merged) https://github.com/dealii/dealii/pull/13095 #13093: Remove a redundant argument to xargs. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/13093 #13080: Minor doc changes to the consensus algorithms (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13080 #13079: Evaluation kernels: Avoid checking the orientations in inner loop (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/13079 #13012: Start from zero vector for MG coarse solver (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/13012 #11358: CI: select 64bit windows platform (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/11358 ## And this is a list of recently opened or closed discussions: #13148: Better document consensus algorithms (opened) https://github.com/dealii/dealii/issues/13148 #13131: GridGenerator::flatten_triangulation() says that it only works for triangulations without hanging nodes... (opened and closed) https://github.com/dealii/dealii/issues/13131 #13127: GridGenerator::flatten_triangulation() does not copy data on boundary edges in 3d (opened) https://github.com/dealii/dealii/issues/13127 #13126: GridGenerator::flatten_triangulation() does not copy manifold ids of internal objects (opened and closed) https://github.com/dealii/dealii/issues/13126 #13122: CMake custom target command contains `rm`, which is not available under windows. (opened and closed) https://github.com/dealii/dealii/issues/13122 #13114: simplex/conv_hex_to_simplex_02 fails with gcc 11.2 (opened) https://github.com/dealii/dealii/issues/13114 #13113: Portable refined triangulation format (opened) https://github.com/dealii/dealii/issues/13113 #13110: Modernize a small aspect of step-20/21 (opened) https://github.com/dealii/dealii/issues/13110 #13106: `FindBoost.cmake` warnings (opened and closed) https://github.com/dealii/dealii/issues/13106 #13104: Problem with BOOST_SERIALIZATION_USABLE (opened and closed) https://github.com/dealii/dealii/issues/13104 #13103: Names of FEInterfaceValues functions (opened) https://github.com/dealii/dealii/issues/13103 #13100: PETSc object is in wrong state (closed) https://github.com/dealii/dealii/issues/13100 #13089: Fix indent script warnings (closed) https://github.com/dealii/dealii/issues/13089 #13074: Failure in ConsensusAlgorithms::NBX<T1, T2>::answer_requests() (closed) https://github.com/dealii/dealii/issues/13074 #13052: Warnings in data_out_base.cc (closed) https://github.com/dealii/dealii/issues/13052 #13034: Wrong .prm files in step-60 (closed) https://github.com/dealii/dealii/issues/13034 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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