Solver Enhancements for 2026

The following enhancements to the analysis solvers provide you with better solutions and improved accuracy.

Default Shrinkage Model change for 3D Analyses

The Shrinkage Test Adjusted Mechanical Properties (STAMP) 3D shrinkage model is now the default shrinkage model for thermoplastic polymers with measured shrinkage data. The STAMP model achieves improved shrinkage and warpage accuracy by calibrating the modulus, Poisson's ratio and coefficient of thermal expansion based on the measured shrinkage data. Compared to prior Moldflow releases, you will see changed deflection predictions from Moldflow Insight 2026 for all thermoplastics with measured shrinkage data. You can override this default shrinkage model selection by choosing a different 3D shrinkage model on the Shrinkage Properties tab of the thermoplastic material data.

Improved stress result accuracy for the STAMP shrinkage model

In the Moldflow 2026 release, we have improved the way that a 3D Warp analysis using the STAMP shrinkage model calculates the stresses which remain in the part after deflection. These stresses can be viewed in the Stress, Mises-Hencky and Stress tensor (warp) results. Now, these stresses will be more realistic and similar in magnitude to the stresses predicted by the Uncorrected Residual Stress model. For most molding processes, this change does not have a significant effect on STAMP warp deflection predictions. However, for 2-shot overmolding processes, the deflection predictions with STAMP will now be more realistic, due to improved balancing of stresses in the two components. This change also improves the accuracy of calculation of birefringence with the STAMP shrinkage model compared to prior versions of STAMP.

Reduced Solution Time for 3D Warp Analysis

The computation time for 3D Warp analyses is now faster thanks to code efficiency improvements. These improvements do not introduce any loss of solution accuracy. The speed gains will vary depending on the model. Due to these improvements, you will see increased memory usage during 3D Warp analyses.

Reduced Solution Time for 3D Fill+Pack Analysis

The transfer of intermediate results for 3D Fill and 3D Fill+Pack analyses has been improved. This allows faster calculations when running analyses in Synergy, with no loss of accuracy. This improvement is achieved by each 3D analysis producing multiple smaller of1 result files. The speed gains are greatest for large models with many intermediate results, and for analyses run on the cloud or across the local network.

There is no speed gain for:

analyses launched from the command line using runstudy
when the option to Dynamically updated results display during analysis is turned off

where the transfer of intermediate result files occurs after the analysis has completed.

Note: This change means that it is not possible to view results of a Moldflow 2026 3D analysis in prior versions of Moldflow, including prior versions of Moldflow Communicator.

Calculation of Composite Properties

We have improved the accuracy of the thermal expansion coefficients calculation for composite materials in Midplane and Dual Domain analyses, making them more consistent with 3D analyses. The improvements may change the warp prediction of deflected part shape for all composite materials filled with fibers or disk-like fillers, although in most cases the differences are likely to be negligible.

Automatic Velocity/Pressure (V/P) switch-over for 3D analyses

We have improved the calculation of automatic V/P switch-over for 3D Fill+Pack analyses by more accurately accounting for the compressibility of polymer melt in barrel and hot runner manifold. This improvement affects models with a large hot runner volume and usually results in switching later from velocity controlled injection to pressure controlled injection.

Calculation of ram position for Midplane and Dual Domain (DD) analyses

When using an Absolute ram speed profile for a Midplane or DD Fill+Pack analysis, the solver calculates and shows how the ram position progresses over time. In the Moldflow 2026 release, we have improved the calculation of the melt density change in the barrel during the injection phase. This improvement only affects Midplane or DD analysis when Absolute ram speed profile is selected. Compared to the Moldflow 2025 release, in the Moldflow 2026 release, the calculated melt compression effect will be stronger, meaning that the ram will move further before the cavity is filled.

Calculation of "Total part weight: XY plot" for 3D Compression analysis

The "Total part weight: XY plot" shows the evolution of total part weight versus time. For a 3D Compression or Injection/Compression analysis, the calculated total part weight may oscillate during the compression phase in the Moldflow 2025 release. We have improved the algorithm for the calculation of total part weight in the Moldflow 2026 release. This results in more stable output in total part weight during the compression phase.