We released ASPECT v2.3.0 on July 24 with various new features and bugfixes. See
and Release ASPECT 2.3.0 · geodynamics/aspect · GitHub
for more details.
Among others this release includes the following significant changes:
- New: ASPECT now requires deal.II 9.2.0 or newer.
- New: ASPECT has a new, reproducible logo.
(Rene Gassmoeller, Juliane Dannberg)
- New: Mesh deformation now also works in combination with particles. Instead
of the end of the timestep, particles are now advected before solving
the compositional field advection equations. In iterative advection
schemes, the particle location is restored before each iteration.
(Anne Glerum, Rene Gassmoeller, Robert Citron)
- New: ASPECT now supports the creation of visualization postprocessors that
only output data on the surface of a model. An example is the “surface
stress” visualization postprocessor.
- New: A new class TimeStepping::Manager to control time stepping with a plugin
architecture has been added. The architecture allows to repeat time steps
if the time step length changes significantly.
- New: A mesh refinement plugin that allows to set regions of minimum and
maximum refinement level between isosurfaces of solution variables.
(Menno Fraters and Haoyuan Li)
- New: There is a new nullspace removal option ‘net surface rotation’,
which removes the net rotation of the surface.
- New: Particle advection can now be used in combination with the repetition of
timesteps. Before each repetition the particles are restored to their previous
- New: There is a new property in the depth average postprocessor that averages
the mass of a compositional field (rather than its volume).
- New: The Drucker Prager rheology module now has an option to include a
plastic damper, which acts to stabilize the plasticity formulation. At
sufficient resolutions for a given plastic damper viscosity, the plastic
shear band characteristics will be resolution independent.
(John Naliboff and Cedric Thieulot)
- New: ASPECT can now compute viscosity values depending on the values
of phase functions for an arbitrary number of phases.
(Haoyuan Li, 2020/08/06)
- New: Added calculation for temperature-dependent strain healing in the strain
dependent rheology module.
- New: Added new rheology module, which computes the
temperature dependent Frank Kamenetskii viscosity approximation.
- New: ASPECT now includes a CompositeViscoPlastic rheology module. This
rheology is an isostress composite of diffusion, dislocation and Peierls
creep rheologies and optionally includes a damped Drucker-Prager plastic
element. The rheology module for Peierls creep includes a formulation to
compute the exact Peierls viscosity, using an internal Newton-Raphson
(Bob Myhill, John Naliboff and Magali Billen)
- New: There is a new visualization postprocessor ‘principal stress’,
which outputs the principal stress values and directions at every point in the
- New: Added the functionality to compute averages in user defined depth layers
(e.g. lithosphere, asthenosphere, transition zone, lower mantle) to the depth
average postprocessor and the lateral averaging plugin.
- New: The ‘spherical shell’ geometry model now supports periodic boundary
conditions in polar angle direction for a 2D quarter shell (90 degree opening
(Kiran Chotalia, Timo Heister, Rene Gassmoeller)
- New: A new particle interpolator based on quadratic least squares has been
(Mack Gregory, Gerry Puckett)
- New: There is now a mesh deformation plugin “diffusion” that can be used to
diffuse surface topography in box geometry models.
- Bug fixes to: Steinberger and Calderwood viscosity profile, particle
generation, viscous strain weakening, incompressible equation of state,
pressure sign convention, Neumann heat flow boundaries with the Newton
solver, viscosity on the adiabat for extended Boussinesq approximation
models, and many more.
A complete list of all changes and their contributing authors can be found at
Wolfgang Bangerth, Juliane Dannberg, Menno Fraters, Rene Gassmoeller, Anne Glerum, Timo Heister, Bob Myhill, John Naliboff, and many other contributors.