April 2026
The release notes for the upcoming release are:
New features
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Elements
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Initial conditions:
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Loads:
- Renamed all springs to
spring-ground-* - Added springs acting in global x-, y-, z-directions for beam elements and 3D elements
- Renamed all springs to
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Constitutive models
- Hardening Soil: The Hardening Soil model with Matsuoka-Nakai failure surface with benchmarks given in the Benchmark Manual.
- Hypo-ISA-SF | Hypoplastic model for sand according to von Wollfersdorff (1996)1 with intergranular strain anisotropy (ISA) and semi-fluidized state (SF) extension (Tafili et al., 2024)2 with benchmarks given in the Benchmark Manual.
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Anderson acceleration: Anderson acceleration is a general technique for accelerating the convergence of fixed-point iterations (i.e. when the global Jacobian used in the Newton-Raphson iteration is not updated at every iteration or changes only mildly - for instance when an elastic tangent is used in place of the consistent elasto-plastic tangent). For more information please refer to the Refernce and the Theory manuals.
General modifications
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Performance
- Performance of the PARDISO solver was noticeably improved, reducing solve time by up to a factor of 3.
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Constitutive models
- Barotropic elasticity was modified such that for void ratios smaller than \(e<10^{-3}\) the pyknotropy feature is deactivated
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Output
- Stress and Strain output are now requested via
stressandstrain, respectively. The old keywordsSandEare deprecated (backward compatibility is maintained). - More detailed information for cutback reasons during automatic time stepping reported in statistic (.sta) and message (.msg) files
- Stress and Strain output are now requested via
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Accelerator: New keyword
*Acceleratorwhich gives a unified interface so methods desinged to improve convergence of the iterative solution process (implicit simulations). The new keyword replaces the old*Line search, however, backward compatibility is maintained. See the Refernce and the Theory manuals for more information.
Resolved bugs
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Resolved bug for *Equations where the coupling terms between two constrained degrees of freedom are inactive in the model
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Resolved bug for hypoplastic/Sanisand contact models.
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Linux versions: import of random fields from csv-files fixed
Manuals
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Benchmark Manual
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Reference Manual
- Improved documentation of the barotropic elasticity
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Theory Manual
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Tutorial Manual
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Corrected erroneous material definition in the tutorials on oedometric compression, drained mon. triaxial test, undrained mon. triaxial test and undrained cyclic triaxial test
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User defined extensions: Added a note regarding thread-safety requirements and the necessity of stack allocation for local variables.
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P.-A. Wolffersdorff. A hypoplastic relation for granular materials with a predefined limit state surface. Mechanics of Cohesive-frictional Materials, 1(3):251–271, 1996. doi:10.1002/(SICI)1099-1484(199607)1:3<251::AID-CFM13>3.0.CO;2-3. ↩
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Merita Tafili, Jose Duque, David Mašín, and Torsten Wichtmann. A hypoplastic model for pre-and post-liquefaction analysis of sands. Computers and Geotechnics, 171:106314, 2024. ↩