Hello everyone! This is deal.II newsletter #224. 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: #14245: PreconditionRelaxation: add specialization (proposed by peterrum) https://github.com/dealii/dealii/pull/14245 #14244: DiagonalMatrix: specialize for LA:d:V (proposed by peterrum) https://github.com/dealii/dealii/pull/14244 #14243: [WIP] TensorProductMatrixSymmetricSum for matrices with rows/columns filled with zero (proposed by peterrum) https://github.com/dealii/dealii/pull/14243 #14242: PreconditionChebyshev: reduce number of writes by one (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14242 #14241: Fix a warning (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14241 #14240: FEEvaluation: Create temporary copy of Jacobian matrix in submit_XXX (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14240 #14239: MatrixFree: Fix assertion in presence of FE_Nothing (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14239 #14238: Add specializations of PreconditionRelaxation functions (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14238 #14237: Specialize EvaluatorTensorProduct<evaluate_evenodd> for non-templated execution (proposed by peterrum) https://github.com/dealii/dealii/pull/14237 #14236: support XDMF writing with ranks without cells (proposed by tjhei) https://github.com/dealii/dealii/pull/14236 #14235: fix: step-50 PETSc (proposed by tjhei; merged) https://github.com/dealii/dealii/pull/14235 #14234: Normal flux constraints: map DoF indices to vector DoF indices (proposed by zjiaqi2018) https://github.com/dealii/dealii/pull/14234 #14232: Enable SolverIDR for block vectors (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14232 #14231: Doc update in GridTools. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/14231 #14230: Remove an outdated comment. Link to step-19. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/14230 #14229: Clarify a comment for one of the particle generators. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/14229 #14228: Precompile TensorProductMatrixSymmetricSum kernels (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14228 #14227: Set another OMP environment variable. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/14227 #14226: MatrixFree laplace operator: Restructure computation of diagonal (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14226 #14225: Adjust interface in 'dofs' folder to new datatype 'types::fe_index'. (proposed by marcfehling) https://github.com/dealii/dealii/pull/14225 #14224: Fix bug in matrix-free operators regarding diagonal (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14224 #14223: Update output (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14223 #14222: Fix test case with clang compiler (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14222 #14221: Fuse some loops in Triangulation::execute_coarsening (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14221 #14220: Merge two loops in setup of triangulation (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14220 #14219: MatrixFree: Fix bug in setup of new cell_index for MG (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14219 #14218: Avoid warning about unused variable (proposed by kronbichler; merged) https://github.com/dealii/dealii/pull/14218 #14216: Add specializations of PreconditionChebyshev functions (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14216 #14215: Fix PETSc version detection. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/14215 #14214: Fix docker build (proposed by bergbauer; merged) https://github.com/dealii/dealii/pull/14214 #14213: Clarify comments about get_generalized_support_points(). (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/14213 #14212: Move invalid_fe_index to numbers. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/14212 #14211: Update checks for AD-types. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/14211 #14210: Move active_fe_index_type to types. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/14210 #14209: Optimize PreconditionRelaxation (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14209 #14208: Added get/set functions for future FE indices. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/14208 #14207: Change get_active_fe_indices() to return the result. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/14207 #14206: CMake: Avoid --date=iso-strict for git versions older than 2.2 (proposed by tamiko; merged) https://github.com/dealii/dealii/pull/14206 #14205: Adolc tensor refactor (proposed by drwells) https://github.com/dealii/dealii/pull/14205 #14204: Do not use --date=iso-strict in DEAL_II_QUERY_GIT_INFORMATION (proposed by peterrum) https://github.com/dealii/dealii/pull/14204 #14203: Fix Kokkos flags (proposed by masterleinad; merged) https://github.com/dealii/dealii/pull/14203 #14202: Add some more missing Trilinos headers. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/14202 #14201: Add a missing header to vector_relations.h. (proposed by drwells; merged) https://github.com/dealii/dealii/pull/14201 #14200: Fix source typos in tests/ (proposed by luzpaz) https://github.com/dealii/dealii/pull/14200 #14199: Cleanup mapping q1 inclusions (proposed by drwells; merged) https://github.com/dealii/dealii/pull/14199 #14198: Fix more headers in Zoltan tests. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/14198 #14197: Fix MatrixFree + FE_Q_iso_Q1(2) (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14197 #14196: Fix header in Zoltan tests. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/14196 #14194: Add missing header to `lac/trilinos_tpetra_vector.templates.h` (proposed by mschreter; merged) https://github.com/dealii/dealii/pull/14194 #14193: Assert for released handle on parallel::distributed::*Transfer classes. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/14193 #14192: Added missing header. (proposed by marcfehling; merged) https://github.com/dealii/dealii/pull/14192 #14191: Trilinos utilities (proposed by drwells; merged) https://github.com/dealii/dealii/pull/14191 #14190: FEEvaluationData: add virtual destructor (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14190 #14178: Add second version of TensorProductMatrixSymmetricSum::apply_inverse() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14178 #14167: No normal flux constraints on level meshes (proposed by zjiaqi2018; merged) https://github.com/dealii/dealii/pull/14167 #14160: Documentation:manifold normal vector (proposed by zjiaqi2018; merged) https://github.com/dealii/dealii/pull/14160 #14159: FEPointEvaluation fix compilation for float (proposed by bergbauer; merged) https://github.com/dealii/dealii/pull/14159 #14140: Generalized VT::point_gradients() for multiple components (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14140 #14130: Introduce inverse of MF::get_cell_iterator() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14130 #14122: Add FEFaceEvaluation::at_boundary() and boundary_id() (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14122 #14121: Add MatrixFreeTools::ElementBirthAndDeathMatrixFree (proposed by peterrum; merged) https://github.com/dealii/dealii/pull/14121 #14097: Clean cgal utilities (proposed by fdrmrc; merged) https://github.com/dealii/dealii/pull/14097 #13895: Use free consensus algorithms functions instead of the class version. (proposed by bangerth; merged) https://github.com/dealii/dealii/pull/13895 #13820: [9.5] Refactor grid fixup functions (proposed by drwells; merged) https://github.com/dealii/dealii/pull/13820 #12759: Add FieldTransfer for the transfer of field with FE_Nothing (proposed by Rombur; merged) https://github.com/dealii/dealii/pull/12759 ## And this is a list of recently opened or closed discussions: #14233: `n_blocks()` and `block()` for non-block vectors (opened) https://github.com/dealii/dealii/issues/14233 #14217: Undefined references when linking with ld.lld (opened) https://github.com/dealii/dealii/issues/14217 #14195: Wrong generalized support points for FESystem(FE_Ndelec) (opened and closed) https://github.com/dealii/dealii/issues/14195 #14189: Internal error in SolutionTransfer (closed) https://github.com/dealii/dealii/issues/14189 #14179: cmake fail to set CXX_FLAGS correctly with independent external kokkos (closed) https://github.com/dealii/dealii/issues/14179 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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