4C version v2026.1.0

What's Changed

Breaking Changes

• Remove deprecated CMake options by @sebproell in #1230
• Write proper csv as DBC monitor output by @c-p-schmidt in #1211
• 1134 always build prebuilt 4c image by @ppraegla in #1341
• Allow reading input fields directly from the (VTU-)mesh by @amgebauer in #1321
• Remove pre_locsys executable by @sebproell in #1413
• Write control files in YAML format by @sebproell in #1407
• [solver] Remove monolithic part of amgnxn by @maxfirmbach in #1434
• Cleanup particle surface energy by @ppraegla in #1499
• Change defaults for RESULTSEVERY and RESTARTEVERY of structure module by @c-p-schmidt in #1534
• Remove old beamcontact input parameters by @davidrudlstorfer in #1549
• Move beam to beam contact to beaminteraction by @davidrudlstorfer in #1551
• [docker] Update Trilinos to 16.2.0 Release by @maxfirmbach in #970
• [solver] Move Ifpack preconditioner construction to Stratimikos by @maxfirmbach in #1406
• Remove cardiovascular0d from old time integration framework by @amgebauer in #1646
• Remove redundant thermo vtk input parameters by @rjoussen in #1663
• Change the 4C CLI parser to CLI11 by @maxiludwig in #1490

Dependency Changes

• [docker] Update Trilinos to 16.2.0 Release by @maxfirmbach in #970
• [ArborX] Bump to v2.0.1 by @maxfirmbach in #1552
• [FFTW] Make it optional by @maxfirmbach in #1644
• Add gmsh as optional dependency by @rjoussen in #1645
• Update MIRCO hash and re enable tests by @RShaw026 in #1656

Miscellaneous

• Tutorial Preconditioning solid (part 1) by @reginabuehler in #1242
• Add AAA (Adaptive Antoulas-Anderson) rational approximation implementation to ReducedLung by @bgoderbauer in #1236
• Add wrapper for GGEV() from LAPACK by @vovannikov in #1246
• [constraint framework] Add nullspace constraint submodel evaluator by @maxfirmbach in #1269
• Generalize projection for solving linear systems by @amgebauer in #1267
• Extract rebalancing from mesh input by @sebproell in #1270
• [beam3r] Implement nullspace computation method by @maxfirmbach in #1271
• Allow Discretization to fill from Mesh by @sebproell in #1273
• Cleanup MPI_Allreduce wrappers by @rjoussen in #1275
• Tutorial Preconditioning fsi (part 2) by @reginabuehler in #1278
• [solver] Add diagonal pertubation to SPAI by @maxfirmbach in #1249
• Add node IDs as yaml data in DBC monitor output by @isteinbrecher in #1290
• Include new material for volume fractions in porofluid-pressure-based framework by @lkoeglmeier in #1110
• Allow data input from mesh file by @amgebauer in #1286
• Add remapping function for AD types by @isteinbrecher in #1316
• Allow to filter Mesh input by @sebproell in #1323
• Add full variant of beam-to-beam point couplings by @isteinbrecher in #1320
• Create 4C module particle by @ppraegla in #1329
• Add some vtu preprocessing information to documentation by @amgebauer in #1310
• Unify 4C Python project by @davidrudlstorfer in #1322
• Use own structure for beam-to-solid penalty law data by @isteinbrecher in #1378
• Add evaluation context to material interface by @amgebauer in #1371
• Add InterpolatedInputFields for point-based input field data by @amgebauer in #1349
• Create new reference documentation layout by @ischeider in #1368
• Enable Tensor and Symmetric Tensor input from yaml/input spec by @amgebauer in #1382
• Add FSI tutorial with monolithic approach by @reginabuehler in #1360
• CMake: allow specifying test dependency versions by @sebproell in #1414
• Add node-based interface aggregation capability for contact/meshtying problems preconditioned with MueLu by @PhilipOesterlePekrun in #878
• Improve input types for Kirchhoff beams by @isteinbrecher in #1402
• Introduce Teko as block preconditioner for ScaTra-Thermo-Interaction by @c-p-schmidt in #1143
• Introduce Teko as block preconditioner for Solid-ScaTra-Interaction by @c-p-schmidt in #1430
• [constraint_framework] Add partial nullspace constraint by @maxfirmbach in #1432
• Add beam-to-beam point couplings via CPP by @isteinbrecher in #1420
• Add sym. HA-product by @tuchpaul in #1474
• Allow setting fiber orientation with mesh data in the mixture module by @amgebauer in #1396
• Point coupling with Kirchhoff by @isteinbrecher in #1502
• Write vtk based output in contact modelevaluator by @c-p-schmidt in #1503
• Allow interactive mesh plots in documentation by @amgebauer in #1505
• Add a tutorial about vtu mesh input in our documentation by @amgebauer in #1512
• Allow for all types of beams in point couplings by @isteinbrecher in #1545
• Add spring dashpot condition for shell7p elements by @mairehenke in #1447
• Let prescribed prestretch strategy take a field by @amgebauer in #1578
• Allow reading bit arrays from vtu files by @amgebauer in #1579
• Allow det, inv, trace, etc on const TensorViews by @amgebauer in #1586
• [Trilinos] Move from Isorropia to Zoltan2 by @maxfirmbach in #596
• Add eigenvalue utilities for non-symmetric tensors (compute eigenvalues, obtain eigenvector to known eigenvalue) by @amgebauer in #1595
• Add direct gmsh input by @rjoussen in #1652
• Setup peridynamic interaction by @georghammerl in #1561
• Allow to specify integration rule for solid element evaluation in input file by @amgebauer in #1669
• [thermo] Enable WRITE_INITIAL_STATE by @rjoussen in #1665
• Enable vtk output for thermo field by @rjoussen in #1676

Contributors

List of all contributors who authored, committed, reviewed, or commented on accepted pull requests for this release, sorted alphabetically.

• Authors / Committers: @amgebauer @bgoderbauer @bwirthl @c-p-schmidt @davidrudlstorfer @dharinib98 @dragos-ana @eulovi @georghammerl @gilrrei @ischeider @isteinbrecher @knarfnitram @lauraengelhardt @lkoeglmeier @m-frey @mairehenke @maxfirmbach @maxiludwig @mayrmt @PhilipOesterlePekrun @ppraegla @reginabuehler @rjoussen @RShaw026 @sebproell @shervas @tuchpaul @vovannikov

• Reviewers: @amgebauer @bgoderbauer @bwirthl @c-p-schmidt @davidrudlstorfer @dharinib98 @dragos-ana @eulovi @georghammerl @gilrrei @ischeider @isteinbrecher @knarfnitram @lauraengelhardt @lkoeglmeier @m-frey @mairehenke @maxfirmbach @maxiludwig @mayrmt @PhilipOesterlePekrun @ppraegla @reginabuehler @rjoussen @RShaw026 @sbrandstaeter @sebproell @slfuchs @tuchpaul @vovannikov

New Contributors

_Thanks to first-time contributors ...

4C version v2025.3.0

What's Changed

Breaking Changes

• Remove RedAirwayTissue problem type by @sebproell in #748
• Remove pre_exodus by @sebproell in #774
• Remove unused DebugWriter for FSI problems by @sebproell in #800
• Remove pseudo geometry type HERM2LINE by @sebproell in #891
• No longer accept .dat input by @sebproell in #907
• IsoNeoHooke: make mu an InputField by @sebproell in #920
• Use nested YAML for generated domain input by @sebproell in #1092
• CMake: document FOUR_C_CXX_ variables by @sebproell in #1135

Major changes

• YAML is the new standard input for 4C
• Tensor and SymmetricTensor implementation by @amgebauer in #862
• InputFields for spatially varying input parameters
• Runtime-output supports additional fields:
  • Spring dashpot boundary condition by @c-p-schmidt in #956
  • Reduced lung module by @bgoderbauer in #696
• Allow vtu mesh input by @amgebauer in #1195

Dependency changes

• [docker] Update Trilinos config and hash for #779 (NOX SingleStep solver modifications) by @vovannikov in #780
• Update ryml to version 0.9.0 by @sebproell in #949
• Add pybind11 as optional dependency by @sebproell in #1075
• Add optional dependency to VTK by @amgebauer in #1192

Miscellaneous

• Improve POINT COUPLING CONDITIONS by @ischeider in #512
• [deal.II] Converters for 4C discretization and vectors into deal.II equivalents by @sebproell in #626
• [Documentation] Introduce jinja templating for tutorials by @ischeider in #694
• [Trilinos] Move direct solver from Amesos to Amesos2 by @maxfirmbach in #662
• [LinAlg] Add FE_Graph capability to Core::LinAlg::Graph by @maxfirmbach in #759
• Major rework of the solid-state battery tutorial by @c-p-schmidt in #769
• Implement dot product between rank 1 tensors by @amgebauer in #770
• Clean up PorofluidElastScatraBaseAlgorithm by @bwirthl in #803
• Add image for oldest supported dependencies by @sebproell in #811
• Convert test input files from .dat to .yaml by @davidrudlstorfer in #801
• Implement wrapper for Epetra import by @dharinib98 in #827
• Implement printing of tensors by @amgebauer in #854
• Generalize dot and ddot product for arbitrarily sized tensors by @amgebauer in #853
• Add validation of parsed values to InputSpecs by @sebproell in #852
• Add runtime output for micromaterial by @m-frey in #143
• Scalar interpolation class by @abhi-satheesh in #851
• InputField class to supply element-wise parameters by @sebproell in #866
• Implement wrapper for Epetra Export by @dharinib98 in #877
• InputSpec can store parsed values to structs by @sebproell in #873
• InputSpecBuilders::selection can store in structs by @sebproell in #884
• Use symmetric tensors in solid element evaluation by @amgebauer in #869
• Input field InputSpec to read local parameters by @maxiludwig in #890
• Allow to store input_field to structs by @sebproell in #904
• Extend installation section of the documentation by @ischeider in #885
• Implement SVD for tensors by @amgebauer in #898
• Allow FAD-types in tensors by @amgebauer in #902
• Implement utility functions for tensor derivative by @amgebauer in #908
• Implement energy embeddedmesh by @eulovi in #828
• Rework SymbolicExpression for better evaluation performance by @sebproell in #913
• Allow for beam-to-solid shell contact with KL shell by @isteinbrecher in #914
• Compile SymbolicExpression to bytecode by @sebproell in #916
• Quaternion interpolation by @abhi-satheesh in #876
• SymbolicExpression with compile-time variables by @sebproell in #919
• Add artery flow rate to function coupling by @bwirthl in #901
• CMake: build shared libraries by default by @sebproell in #925
• Use tensors in solid material evaluation by @amgebauer in #934
• Doc: recommendations for work on input files by @sebproell in #946
• InputSpec: write validators to metadata by @sebproell in #952
• Redistribute discret for point coupling conditions by @georghammerl in #775
• InputSpec for SymbolicExpression by @sebproell in #983
• Fix visualization of distributed moments for the SBIP approach (potential interaction between beams) by @davidrudlstorfer in #967
• Create wrapper for Epetra FE Vector by @knarfnitram in #980
• Redistribute an InputField according to element column map by @sebproell in #991
• Performance improvements for rank 4 tensors (GCC) by @amgebauer in #1002
• [thermo] Add conductivity runtime output by @maxfirmbach in #1016
• Implement Einstein's summation convention by @amgebauer in #999
• [solver] Recompute preconditioner due to linear solver stall by @maxfirmbach in #1031
• Schema validation for vectors by @sebproell in #1065
• Generalize norms evaluation for NOX vectors and reduce the use of get_ref_of_epetra_vector() by @vovannikov in #1066
• Allow documentation of enum values in input by @sebproell in #1074
• Support real YAML as element input for EXODUS meshes by @sebproell in #1081
• Enable Teko solver for porofluid-elasticity-scatra problems with arteries by @bwirthl in #903
• Add pattern validator for input strings by @sebproell in #1136
• Let 4C B free* by @amgebauer in #961
• Add logical operators to symbolic expressions by @sebproell in #1164
• CMake: allow to specifiy required dependenices for tests by @sebproell in #1196
• Beaminteraction using Lagrange multipliers by @dharinib98 in #637
• Introduce new reduced_lung input by @maxiludwig in #1159
• Enable std::array as a supported InputSpec type by @lauraengelhardt in #1178

New Contributors

• @dharinib98 made their first contribution in #400
• @maxdinkel made their first contribution in #778
• @NoraHagmeyer made their first contribution in #839
• @m-frey made their first contribution in #143
• @abhi-satheesh made their first contribution in #851
• @marksidoro made their first contribution in #997
• @dependabot[bot] made their first contribution in #1049

Full Changelog: v2025.2.0...v2025.3.0

4C version v2025.2.0

What's Changed

Breaking Changes

• Make PROBLEMTYPE a required parameter by @sebproell in #376
• Convert some yes/no input values to non-boolean strings by @mayrmt in #424
• Clean up mortar input parameters by @mayrmt in #426
• Remove BACI symbolic link by @davidrudlstorfer in #505
• Remove old so3_poro implementation by @amgebauer in #513
• Remove old solid elements by @amgebauer in #518
• Convert and cleanup contact enums by @mayrmt in #521
• Simplify potential params by @davidrudlstorfer in #563
• Migrate pre_exodus to yaml by @sebproell in #632
• Throw if iterative linear solver does not converge by @mayrmt in #646
• Remove GEOMETRY input parameter by @sebproell in #670
• Update pre commit hooks by @davidrudlstorfer in #699

Major changes

• Removal of old, non-templated solid elements
• Remove elemag by @davidrudlstorfer in #494
• Reorganize our various docs by @sebproell in #523
• Allow to read real yaml as input by @sebproell in #316
• CMake: configuration of supported versions of a dependency by @sebproell in #593
• Warn when using a dat file in a 4C run by @sebproell in #601

Dependency changes

• Use fast ryml library instead of yaml-cpp by @sebproell in #257
• Add magic_enum dependency and allow parameter to take enums by @sebproell in #474
• Build an image with deal.II by @sebproell in #558
• Update MIRCO shape factors and git tag by @RShaw026 in #600
• Add zlib to cmake build process and update imcs cluster preset by @knarfnitram in #624
• Add Google Benchmark for micro-benchmark tests by @amgebauer in #621
• [ArborX] Update ArborX hash and adjust API by @maxfirmbach in #591
• [Trilinos] Update version in docker by @maxfirmbach in #659
• [docker] Update Trilinos config and hash by @maxfirmbach in #684

Miscellaneous

• Tag docker images as main instead of latest by @amgebauer in #247
• Allow 4C to convert dat to yaml by @sebproell in #382
• Migrate pre_exodus to yaml by @sebproell in #632
• Add 4C logo to readme by @davidrudlstorfer in #574

New Contributors

• @ischeider made their first contribution in #251
• @gilrrei made their first contribution in #341
• @PhilipOesterlePekrun made their first contribution in #127
• @vovannikov made their first contribution in #372
• @knarfnitram made their first contribution in #403
• @bwirthl made their first contribution in #446
• @georghammerl made their first contribution in #438
• @lkoeglmeier made their first contribution in #467
• @maxiludwig made their first contribution in #479
• @shervas made their first contribution in #497
• @RShaw026 made their first contribution in #600
• @tuchpaul made their first contribution in #602
• @danielwolff1 made their first contribution in #671

Full Changelog: v2025.1.0...v2025.2.0

4C version 2025.1.0

Thanks to all who have been involved in this release.