# Archived News

- 29.12.2024 Version 2024.4 released (MUMPS solver interface moved to new mumpspy package, python-mumps support, new contact term based on IPC toolkit, etc.), see release notes.

- 30.09.2024 Version 2024.3 released (updated installation instructions, new Stokes traction term, etc.), see release notes.

- 28.06.2024 Version 2024.2 released (multi-point constraints terms + new example, mixed formulation flexoelecticity terms, improved and new eigenvalue problem solvers, etc.), see release notes.

- 29.03.2024 Version 2024.1 released (new constant-in-a-region field approximation, new term: passive large deformation fibres with exponential elastic response, improved solver status reporting, wedge elements + example, multi-node linear combination (boundary) conditions + example, etc.), see release notes.

- 29.12.2023 Version 2023.4 released (new structural elements (linear spring, linear truss), spectral element method (LGL quadrature and nodes with Lagrange basis), initial support for meshes with elements of different topological dimensions, new examples: 2D and 3D truss bridge, h-refinement eigenvalue convergence, beam consisting of hexa and tetra elements, many more examples included in gallery, etc.), see release notes.

- 29.09.2023 Version 2023.3 released (example demonstrating nonlinear diffusion and volume forces terms, new sensitivity term, proof-of-concept JAX-based auto-differentiable terms (elasticity, mass) + elastodynamics parameter identification example, etc.), see release notes.

- 29.06.2023 Version 2023.2 released (replace numpy.distutils by scikit-build (cmake), interface for the PRIMME eigenvalue problem solver, new declarative modal analysis example, new terms: nonlinear diffusion and nonlinear volume forces, etc.), see release notes.

- 29.03.2023 Version 2023.1 released (support meshes with cells of different topological dimensions, unified treatment of volume and surface integrals, updated elastodynamics solvers, reciprocal mass matrix algorithm, seismic load and piezo-elastodynamics examples, use GitHub Actions for CI, etc.), see release notes.

- 29.12.2022 Version 2022.4 released (new examples: transient heat equation with several material domains and scalar Helmholtz equation, adaptive time step control for elastodynamics solvers, central difference elastodynamics solver, etc.), see release notes.

- 29.09.2022 Version 2022.3 released (reorganized scripts, PyPI support, speed-up of linear elastodynamics problems, improved homogenization-based recovery of micro-scale solutions, etc.), see release notes.

- 29.06.2022 Version 2022.2 released (custom testing code replaced by pytest, improved pyvista-based visualization script, etc.), see release notes.

- 30.03.2022 Version 2022.1 released (new handling of state variables data and State class removal, many new sensitivity analysis terms based on multi-linear term implementation, etc.), see release notes.

- 29.12.2021 Version 2021.4 released (improved pyvista-based visualization script resview.py, gallery images generated using resview.py, homogenization tools: new parallel recovery of multiple microstructures, new “dry water” flow example, etc.), see release notes.

- 29.09.2021 Version 2021.3 released (unified volume and surface integration terms, improved pyvista-based visualization script, etc.), see release notes.

- 29.06.2021 Version 2021.2 released (new sensitivity analysis terms, positive FE basis based on Bernstein polynomials, smaller memory footprint of terms with constant material parameters, etc.), see release notes.

- 29.03.2021 Version 2021.1 released (non-square homogenized coefficient matrices, new implementation of multi-linear terms, improved handling of Dirichlet and periodic boundary conditions in common nodes, terms in the term table document linked to examples, etc.), see release notes.

- 27.12.2020 Version 2020.4 released (Ogden hyperelastic term, serendipity finite element basis of orders 1-3, etc.), see release notes.

- 29.09.2020 Version 2020.3 released (new script for visualizations based on pyvista, generalized Yeoh hyperelastic term + example, etc.), see release notes.

- 30.06.2020 Version 2020.2 released (discontinuous Galerkin method implementation and examples, new website look, memory usage improvements, etc.), see release notes.

- 31.03.2020 Version 2020.1 released (reading/writing of additional mesh formats by using meshio), Python 3 only from now on, etc.), see release notes.

- 23.12.2019 Version 2019.4 released (support surface terms in 1D problems, improved Gmsh mesh format support (write .msh files), new updating procedure in nonlinear homogenization, improved/faster log plotter, etc.), see release notes.

- 24.09.2019 Version 2019.3 released (interface to eigenvalue problem solvers in SLEPc, new Python 3 enabled Timer class and other Python 3 compatibility fixes, etc.), see release notes.

- 02.07.2019 Version 2019.2 released (improved support for time-dependent homogenization problems, Python 3.7 compatibility, etc.), see release notes.

- 26.03.2019 Version 2019.1 released (automatic fallback for linear solvers, quadratic eigenvalue problem solver, etc.), see release notes.

- 27.12.2018 Version 2018.4 released (better support for eigenvalue problems, improved MUMPS solver interface, support for logging and plotting of complex values, etc.), see release notes.

- 17.09.2018 Version 2018.3 released (easier setting of values of variables, new script for outline edge extraction, new example: homogenization of a piezoelectric heterogeneous structure, etc.), see release notes.

- 19.06.2018 Version 2018.2 released (generalized-alpha and velocity Verlet elastodynamics solvers, terms for dispersion in fluids, caching of reference coordinates for faster repeated use of probes, new wrapper of MUMPS linear solver for parallel runs, etc.), see release notes.

- 06.03.2018 Version 2018.1 released (major update of time-stepping solvers and solver handling, Newmark and Bathe elastodynamics solvers, interface to MUMPS linear solver, new examples: iron plate impact problem (elastodynamics), incompressible Mooney-Rivlin material model (hyperelasticity) as a script, etc.), see release notes.

- 29.12.2017 Version 2017.4 released (basic support for penalty-based contacts, support for user-defined contexts in all solvers and preconditioners, new example: dispersion analysis of heterogeneous periodic materials, etc.), see release notes.

- 19.09.2017 Version 2017.3 released (support preconditioning in SciPy and PyAMG based linear solvers, user-defined preconditioners for PETSc linear solvers, parallel multiscale (macro-micro) homogenization-based computations, improved tutorial and installation instructions, etc.), see release notes.

- 19.05.2017 Version 2017.2 released (simplified and unified implementation of some homogenized coefficients, support for saving custom structured data to HDF5 files, new tutorial on preparing meshes using FreeCAD/OpenSCAD and Gmsh, etc.), see release notes.

- 28.02.2017 Version 2017.1 released (spline-box parametrization of an arbitrary field, conda-forge recipe, fixes for Python 3.6, etc.), see release notes.

- 07.12.2016 Version 2016.4 released (support tensor product element meshes with one-level hanging nodes, improve homogenization support for large deformations, parallel calculation of homogenized coefficients and related sub-problems, evaluation of second derivatives of Lagrange basis functions, etc.), see release notes.

- 30.09.2016 Version 2016.3 released (Python 3 support, testing with Travis CI, new classes for homogenized coefficients, using argparse instead of optparse, etc.), see release notes.

- 12.05.2016 Version 2016.2 released (partial shell10x element implementation, parallel computation of homogenized coefficients, clean up of elastic terms, read support for msh mesh file format of gmsh, etc.), see release notes.

- 24.02.2016 Version 2016.1 released (major simplification of finite element field code, automatic checking of shapes of term arguments, improved mesh parametrization code and documentation, support for fieldsplit preconditioners of PETSc, etc.), see release notes.

- 01.12.2015 Version 2015.4 released (basic support for restart files, new type of linear combination boundary conditions, balloon inflation example, etc.), see release notes.

- 23.09.2015 Version 2015.3 released (preliminary support for parallel computing, unified evaluation of basis functions (= isogeometric analysis fields can be evaluated in arbitrary points), (mostly) fixed finding of reference element coordinates of physical points, several new or improved examples, etc.), see release notes.

- 29.05.2015 Version 2015.2 released (major code simplification (removed element groups), time stepping solvers updated for interactive use, improved finding of reference element coordinates of physical points, reorganized examples, reorganized installation on POSIX systems (sfepy-run script), etc.), see release notes.

- 26.02.2015 Version 2015.1 released (support for multiple fields in isogeometric analysis, redesigned handling of solver parameters, new modal analysis example, etc.), see release notes.

- 28.11.2014 Version 2014.4 released (preliminary support for 1D problems, data probes using pyVTK library, etc.), see release notes.

- 25.09.2014 Version 2014.3 released (isogeometric analysis (IGA) speed-up by C implementation of NURBS basis evaluation, generalized linear combination boundary conditions that work between different fields/variables and support non-homogeneous periodic conditions, non-constant essential boundary conditions given by a function in IGA, reorganized and improved documentation, etc.), see release notes.

- 23.05.2014 Version 2014.2 released (preliminary support for isogeometric analysis, improved postprocessing and visualization script for time-dependent problems with adaptive time steps, three new terms, etc.), see release notes.

- 25.02.2014 Version 2014.1 released (sfepy.fem was split to separate FEM-specific and general modules, lower memory usage by creating active DOF connectivities directly from field connectivities, new handling of field and variable shapes, clean up: many obsolete modules were removed, all module names follow naming conventions, etc.), see release notes.

- 22.11.2013 Version 2013.4 released (simplified quadrature definition, equation sequence solver, initial support for ‘plate’ integration/connectivity type, script for visualization of quadrature points and weights, etc.), see release notes.

- 18.09.2013 Version 2013.3 released (implementation of Mesh topology data structures in C, implementation of regions based on C Mesh, MultiProblem solver for conjugate solution of subproblems, new advanced examples (vibro-acoustics, Stokes flow with slip conditions), etc.), see release notes.

- 22.05.2013 Version 2013.2 released (automatic testing of term calls (many terms fixed w.r.t. corner cases), new elastic contact plane term + example, translated low level base functions from Cython to C for reusability, improved gallery http://docs.sfepy.org/gallery/gallery, etc.), see release notes.

- 27.02.2013 Version 2013.1 released (unified use of stationary and evolutionary solvers, new implicit adaptive time stepping solver, elements of set and nodes of set region selectors, simplified setting of variables data, etc.), see release notes.

- 21.11.2012 Version 2012.4 released (initial support for hierarchical basis on quadrilateral and brick elements, unified C/Cython structures for reference mappings, new linear combination boundary condition: edge direction, new examples showing some advanced features, etc.), see release notes.

- 12.09.2012 Version 2012.3 released (several new terms, material parameters can be defined per region using region names, base function values can be defined per element, support for global options, etc.), see release notes.

- 29.05.2012 Version 2012.2 released (reimplement acoustic band gaps code using the homogenization engine, high order quadrature rules, unify dot product and mass terms, lots of other term updates/fixes, update the PDE solver application, etc.), see release notes.

- 27.02.2012 Version 2012.1 released (initial version of linearizer of higher order solutions, rewrite variable and evaluate cache history handling, lots of term updates/fixes/simplifications, move web front page to sphinx docs, etc.), see release notes.

- 05.12.2011 Version 2011.4 released (cython used instead of swig to interface C code, many terms unified thanks to new optional material term argument type, updated Lagrangian formulation for large deformations, automatic generation of gallery of examples, etc.), see release notes.

- 10.08.2011 Version 2011.3 released (major update of terms aiming at easier usage and definition while retaining original C functions, overriding problem description items on command line, improved developer guide, Primer tutorial - a step-by-step walk-through of the process to solve a simple mechanics problem, etc.), see release notes.

- 31.05.2011 Version 2011.2 released (experimental implementation of terms aiming at easier usage and definition of new terms, Mooney-Rivlin membrane term, update build system to use exclusively setup.py, allow switching boundary conditions on/off depending on time, support for variable time step solvers, etc.), see release notes.

- 24.03.2011 Version 2011.1 released (discontinuous approximations, user-defined material nonlinearities, improved surface approximations, speed-up mesh reading, extensive clean-up - less code, many bugfixes and many more updates), see release notes.

- 06.12.2010 Version 2010.4 released (higher order elements, refactoring of geometries (reference mappings), transparent DOF vector synchronization with variables, interface variables defined on a surface region, many bugfixes and many more updates), see release notes.

- 06.08.2010 Version 2010.3 released (significantly rewritten code for better interactive use, cleaner and simpler high level interface, new examples, tests, simplified but more powerful homogenization engine, many bugfixes), see release notes.

- 10.05.2010 Version 2010.2 released (significantly updated documentation, new mesh readers, conversion formulas for elastic constants, basic tensor transformations, stress tensor conversion, new examples, tests, many new terms and bugfixes), see release notes.

- 01.03.2010 Version 2010.1 released (new sphinx-based documentation, refactoring of base functions (polynomial spaces) and element geometry description, interpolation between different meshes, terms for describing perfusion and active fibres in the total Lagrangian formulation (applicable, for example, to active muscle tissue models) new tests, many new terms and bugfixes), see release notes.

- 24.11.2009 Version 2009.4 released (greatly improved postprocessing and visualization capabilities, unified handling of user-defined functions, new tests, terms, many bugfixes), see release notes.

- 21.07.2009 Version 2009.3 released (_Windows installation_, updated postproc.py - visualization, new tests, terms, solvers, bugfixes), see release notes.

- 12.05.2009 Version 2009.2 released (new top level scripts (_isfepy_ - customized IPython shell, _postproc.py_ - mayavi2 based result viewer, _probe.py_), automatic html documentation generation via doxygen, new solvers, new mesh readers, extended syntax of equations for boundary traces of variables, short syntax for almost all input elements and other improvements), see release notes.

- 02.03.2009 Version 2009.1 released (new solvers, new mesh readers, unified homogenization framework, dispersion analysis, phase velocity computation for phononic materials and other improvements), see release notes.

- 04.12.2008 Version 2008.4 released (framework for running parametric studies, greatly improved support for time-dependent problems, live plotting using multiprocessing module, type of term arguments determined fully at run-time, new terms and other improvements), see release notes.

- 02.09.2008 Version 00.50.00 released (finite strain elasticity: total Lagrangian (TL) formulation, solving problems in complex numbers, generalized equations to allow linear combination of terms, run-time type of state term arguments, refactoring to follow Python coding style guidelines and other improvements), see release notes.

- 01.07.2008 Version 00.46.02 released (alternative short syntax for specifying essential boundary conditions, variables and regions, manufactured solutions tests using !SymPy and other improvements), see release notes.

- 26.03.2008 Version 00.41.03 released (works on 64 bits, support for various mesh formats, new solvers and other improvements), see release notes.