We are pleased to announce the release of ASPECT 2.1.0. ASPECT is the
Advanced
Solver for Problems in Earth’s ConvecTion. It uses modern numerical
methods such
as adaptive mesh refinement, multigrid, and a modular software design to
provide a fast, flexible, and extensible mantle convection solver. ASPECT is
available from
https://aspect.geodynamics.org/
and the release is available from
https://geodynamics.org/cig/software/aspect/
and
https://github.com/geodynamics/aspect/releases/tag/v2.1.0
This release includes the following significant changes:
* New: ASPECT has a new plugin system that allows to prescribe a fixed
heat flux (instead of prescribing the temperature) at the model
boundaries.
* New: Compositional fields can optionally be advected with the melt
velocity.
* New: There is now a visualization postprocessor that outputs the
compaction
length, the characteristic length scale of melt transport.
* New: ASPECT can optionally use the Geodynamic World Builder
(https://github.com/GeodynamicWorldBuilder/WorldBuilder/) to create
complex
initial conditions for temperature and composition.
* New: ASPECT can now read in a depth-dependent vs to density
conversion file, which
can be used with the included tomography model plugins.
* New: ASPECT can now read in a depth-dependent initial temperature
from file.
* New: The ‘ascii data’ and ‘function’ boundary velocity plugins now allow
velocities to be specified along spherical (up, east, north) unit
vectors.
* New: Added a visualization plugin that directly outputs the strain
rate tensor.
* New: ASPECT can now call PerpleX to calculate material properties, phase
amounts and compositions on-the-fly. This model is provided as a
proof-of-concept; more efficient procedures are required for
production runs.
* New: ASPECT now outputs a dynamically generated URL based on used
features to
ask people to cite appropriate papers.
* New: ASPECT has two visualization postprocessors which calculate and
output
the grain lag angle and the infinite strain axis (ISA) rotation
timescale,
respectively. These two quantities can be used to calculate the grain
orientation lag parameter of Kaminski and Ribe (G3, 2002).
* Improved: The artificial diffusion term that is added in the entropy
viscosity method to the temperature and composition equations is now
computed
as the maximum of the physical diffusion and entropy viscosity
instead of the
sum. This reduces numerical diffusion for the temperature field.
* New: Compositional fields can now be prescribed to a value that is
computed
in the material model as an additional output at every time step.
* Changed: The heat flux through boundary cells is now computed using the
consistent boundary flux method as described in Gresho, et al.
(1987), which
is much more accurate than the previously used method.
* New: ASPECT can now calculate gravity anomalies in addition to the
geoid.
* New: ASPECT now outputs a file named original.prm in the output
directory
with the exact content of the parameter it got started with.
* New: Added basic support for a volume-of-fluid interface tracking
advection
method in 2D incompressible box models. The VoF method is an
efficient method
to track a distinct compositional field without artificial diffusion.
* New: There is now an option to output visualization data as higher order
polynomials. This is an improvement in accuracy and requires less
disk space
than the ‘Interpolate output’ option that was available before.
However the
new output can only be read by ParaView version 5.5 and newer and is
therefore disabled by default.
* New: Several new benchmark cases were added.
* Many other fixes and smaller improvements.
A complete list of changes and their contributing authors can be found at
https://aspect.geodynamics.org/doc/doxygen/changes_between_2_80_80_and_2_81_80.html
Wolfgang Bangerth, Juliane Dannberg, Rene Gassmoeller, Timo Heister,
Jacqueline Austermann, Menno Fraters, Anne Glerum, John Naliboff,
and many other contributors.
--
Rene Gassmoeller
https://gassmoeller.github.io/
--
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