2024
Upcoming
The next upcoming release will include:
Graphical User Interface
We are proud to announce that numgeo now integrates into the PreProcessor GiD! See GUI
Features:
 Initial state
 A new initial stress type
type=full
is now available allowing to prescribe all components of the stress tensor individually
 A new initial stress type
 Solver
 It is now possible to omit the use of a linear equation solver (see *Step definition).
 Early termination:
 Define target stresses/strains for specific elements that lead to early termination of the step once they are exceeded. See Early termination
Manuals:
 Revised tutorial on element test simulations
 Added new initial stress type to *Initial conditions, type=stress
General modifications:
Resolved bugs:
 Bugfix in Karlsruhe Hydraulic model for update of the degree of saturation
May 2024
The release notes for May 2024 are:
Features:

Elements
 Is is now possible to define the stabilisation parameter \(\alpha\) for stabilized up elements for saturated soils and partially saturated soils via keyword.
 It is now possible to consider Cavitation (only available for upsat elements yet)

Procedures
 It is now possible to scale the critical time increment in explicit dynamics as explained in the step definition.

Load
 Added dampers to connector elements in order to use them as springdamper elements.

Constitutive models
 The HCA implementation now allows to consider different definitions of the cyclic history variable \(g^A\).
Manuals:
 Added documentation for FPLStabilisation
 Added benchmark for Hertzian Contact in 3D
 Added documentation for Bishop effective stress
 Revised installation instructions
General modifications:

Tangential stiffness factor is now five times lower in case the default stiffness, which depends on the material stiffness, is used

Some Abaqusspecific keywords such as
*Heading
or*Preprint
can now be read. In addition, some of the most common 3D element type names of Abaqus are now automatically (internally) changed to the corresponding element type names used in numgeo, which areC3D20
/C3D20R
=U20SOLID
,C3D8R
=U8SOLID3DRED
andC3D8
=U8SOLID3D
Resolved bugs:
 Output variable
CON_F
is now written for all nodes of the node set used in the Connector element definition, not just for the first node of the set  Bugfix of 3D contact in case contact points have a large distance and should not be considered
 Bugfix for calculation of tangential stiffness factor being too low for elements with larger number of integration points
March 2024
The release notes for March 2024 are:
General modifications:
 Revised parts of the code that required the use of
\heaparrays:0
for large FE models on Windows. Performance gains by a factor of up to 5 are observed for large models with the new version of numgeo.
Features:
 Constitutive models
 SANISANDMFs: All parameters are now available in the interface of the model, including the ones whose default values rarely need to be changed.
Manuals:
 Revised installation instructions for Windows
 Added documentation for SanisandMSf
February 2024
The release notes for February 2024 are:
Features:

Procedures
 It is now possible to automatically transfer linear interpolated brick elements with 8 nodes to triquadratic interpolated brick elements with 27 nodes
 Mixed Implicit/Explicit time integration

Elements
 Explicit uU elements, see Reference Manual
 Stabilized up elements for saturated soils, see Reference Manual
 Stabilized up elements for partially saturated soils, see Reference Manual

Constitutive models
 The HCA implementation now allows to consider multiple strain amplitudes during the highcycle phase. Length of statev vector reduced to save some RAM.
 Reimplementation of the Hypo+ISA model
 Added centeredstepsize approximation of the partial derivative of the degree of saturation w.r.t. the capillary pressure \((\partial S^e)/(\partial p_c)\)
 New model: SANISANDF
 New model: SANISANDMFs

Contact
 Special check for nonconverged contact points allowing for better handling of contact points with large distance
 Improved handling of kinks in surfaces

Loads
 Reduced integration order of load for reduced integrated elements
Resolved bugs:
 Bugfix in transparent boundary conditions for 3D elements
 Fixed bug if shell/batch script not existing for user amplitude and user contact
 Fixed bug in the windows version of the user load file
General modifications:
 Improved numerical stability in infiltration processes
 Added statically linked numgeo version
 Default convergence controls are now of type dofbased, see Reference Manual or the Theory Manual
Corrections Keywords Manual:
 Updated default values for maximum number of iterations and convergence criteria