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This release includes the following changes:

• New: Choice between different formulations for the governing equations including Boussinesq and anelastic liquid approximation.
• New: Melt transport (two-phase flow).
• Particles: new generators, ghost exchange, performance improvements, interpolation to fields.
• New: Nondimensional material model for incompressible (using the Boussinesq approximation) and compressible computations (with ALA or TALA) for nondimensionalized problems. This can be used for benchmark problems like Blankenbach, King, etc..
• New: Optional DG method for temperature/composition.
• Adiabatic conditions: rework, now includes a reference density profile.
• Free surface: overhaul.
• New cookbooks: continental extension, finite strain, BurnMan interface, active tracers.
• New benchmarks: TanGurnis, Blankenbach, King.
• New: viscoplastic material model.
• Material model interface cleanup.
• Assembly performance improvements.
• New: memory statistics postprocessor.
• New: initial topography plugins.
• Many other fixes and small improvements.

A complete list of changes can be found at https://aspect.dealii.org/doc/doxygen/changes_between_1_84_80_and_1_85_80.html

This release includes the following changes:

• Complete overhaul of the particle architecture.
• Modularization of the assembly process.
• Large improvements to serial and parallel performance of particle handling.
• Support for traction boundary conditions.
• Support for time-dependent mesh refinement criteria.
• Flexible support for modifying the underlying FEM variables for the PDE.
• Optional DG support for temperature and compositional fields.
• More robust parallel file I/O.
• Support for tangential mesh velocity boundaries in free surface computations.
• Support for anisotropic viscosity.
• Various fixes to free surface computations: checkpointing, better stabilization, crash fixes.
• New Chunk Geometry model.
• New material property averaging options.
• Complete rewrite of the heating model infrastructure.
• Several new cookbooks.
• Several new postprocessors.
• Support for signals in various locations that allows plugins to inspect/manipulate things inside the core application.
• Several new mesh refinement plugins.
• Improved spherical interpolation of data used in the GPlates plugin.
• Many other fixes and small improvements.

A complete list of changes can be found at https://aspect.dealii.org/doc/doxygen/changes_between_1_83_and_1_84_80.html and the release is also available from https://github.com/geodynamics/aspect/releases/tag/v1.4.0

Changelist:

• New: Averaging of material properties between the quadrature points of a cell. This greatly increases the stability of solutions in simulations with spatially varying coefficients, and also greatly accelerates the solution, at times up to a factor of ten.
• Corrections to the entropy stabilization scheme for compositional fields.
• Fixed and extended: Removal of rigid body translations and rotations when the simulation has a nullspace.
• New: VTU visualization output can now be grouped into an arbitrary number of files per time step.
• Various fixes to the nonlinear solver residual computation.
• New visualization postprocessors that can output the shear stress and full stress tensors.
• Fixes to the latent heat formulation.
• New 'ascii data' plugins for boundary and initial conditions.
• New mass flux statistics postprocessor.
• Many other fixes and small improvements.

A complete list of changes can be found at http://aspect.dealii.org/doc/doxygen/changes_between_1_82_and_1_83.html

Changelist:

• methods to have truly concentric shells without distorted cells
• linear solver improvements which give up to 2x speedup in some cases
• boundary names like "top" instead of numbers are now supported in input files
• new example: free surface computation with a crust as a stagnant lid
• new benchmarks: Davies et al. and Burstedde et al.
• new initial condition: S40RTS perturbation based on shear wave data
• fixes to minimum/maximum refinement plugins
• better error messages when linear solvers fail
• many other fixes and small improvements (direct solver, file output, checkpointing, etc.)

A complete list of changes can be found at http://aspect.dealii.org/doc/doxygen/changes_between_1_81_and_1_82.html